I found this video after someone gave me a 1970 mercury 40 4hp. This helped me a lot because he gave it to me because he couldn’t get it to run more than a couple of seconds. After watching this video I have it running like a champ now. Putting it on my 1232 jon boat soon and river testing it.
I'm loving your videos. I bought a little seamaid boat that came with a trolling motor and a 15hp evinrude for 300. I just about got her going without having to put too much money into it. These videos give me more confidence in working on my own outboards. Much appreciated!
Doing a '73 20hp Merc now Complete restore lots of fun, love those old Mercs, great videos!! Amazed at how 49 year old parts are still in great shape. Carl is Proud.
I like the dirty and real way you put these videos together. Don't edit the video to make it look like you're a wizard, show the mess, show the little mistakes that you can correct given a little more poking. Speeding up the carb rebuild with notes was well done.
I just wanted to say thank you! I have a1969 4hp and although it’s slightly different, your videos helped me completely rebuild it and it’s been running great on the water for. A few weeks now! Thanks for the info and encouragement!
This is exactly what I needed. I have a 1979 4.5 and it's identical. Now mine starts on the first pull. Parts are expensive when you can find them. Thank you!
I really enjoy your videos. I have a 78 9.9 Johnson that I have running now because I’ve watched your videos. Thanks and keep doing what you are doing.
Hi, thanks for the video. I have 2 of these engines that both need a carb and pump rebuild. This is the only video i can find anywhere on how to do it. Excellent detail on how to do it too, again, thank you, you have saved 2 old mercury engines here in northern ireland
I just bought a Mercury 4.5, looks like it’s from the 80’s for $50. Looks exactly the same as yours. Very nice shape. I’ve been messing with that choke lever for the past 45 mins, and I thought, I’ll look through your old videos to see if you’ve done one, low and behold, your tip just saved me breaking the choke lever off. Thank you. Love the vids.
Just have to say great video i just bought a 73 40 hp merc.for 25 brought it home stuck her in the tank and put fuel to it 4 pulls and she started right up
mate I have to admit this is one of the best tutorial iv seen, I have this engin in my living room and about to redo the carb, thanks youve just made it easy. rgds from Montreal
Just brought 1 the same for $40 !! only a red band - after watching your video can’t wait to crack it open and go through it and get it running Cheers from Tasmania
This is a very helpful tutorial, I followed it step by step, and added my own personal touches as well. Very good video and got my motor running. You are going to hit your own kinks down the road but it is up to you to figure it out! Glad mine is back to life, I got it for free and put less than a $100 in it. You can see a running video in my shorts. Thanks!
I will also add that if your motor has had life in saltwater, this road will be a little bit more difficult for you as was mine. But this is a fantastic reference and overall step by step to guide you.
Where did you order the parts? I found old merc parts the site but what do you recommend? Mine seems mechanically sound, but it’s not spitting so I am gonna have to do the impeller so I’m gonna be ordering parts tonight
Great show !! Thank you for showing how to get the 4 hp Merc running I just got almost the same Merc 4.5 hp but I need to do the same fix you did to your 4.0 hp. super good video.
Was this an intended pun - a 2 stroke Merc "smoking" deal? They DO smoke and I do love them. You have the patience of a saint when you continue to answer nicely on the 37th question about where you buy your parts from. C'mon people. read the comments, then ask if it isn't already answered! By the way, you probably figured out that the little square bolt that holds down the shift shaft seal is a 13/64ths. Have you ever seen one of these 70's Mercs that runs counter clockwise? My 1972 Merc 40 4 HP does. Impeller vanes have to face the other way.
Carbs have always been a thorn in my side . BUT... now, I guess I need to get a couple outboards out of the barn and tinker with them. I have a 9.8 Merc, 9.9 Merc and a 15hp Gamefisher. One of the Mercs ran when put up and the Gamefisher needs a new recoil assembly. I can test them in a tank similar to yours and on my 14' rowboat that I'm making into a small bass boat. Good luck fishing. Oh yeah, let me know if you got the pics of the Glasspar.
Warning it can get addicting. Just this summer 1 surfjet 84, 1 1968 AquaFun mini boat. 1 62 Owens Ski Boat a 55 LakeCraft Demon cedar strip and about 30 small motors all under 100hp lol wife ready to kill me lol
Love the old Mercury, I just pick up a 73 4hp it started but I shut it off wasn't pumping water I got an impeller it's going in today I hope I have good luck with this Mercury
Nice Work and good instructions on how to! A big thank you from Sweden! I got my own Mercury 1977 outboard that need a new impeller :) now I know how! 🙏
@@Michaelsbackyardmarina Hi there again! I have some issues with my 1977 mercury 4,5hp 2 stroke. when i have the gas throttle on shift mode, the whole motor is vibrating a lot and the sound from the engine is not consistent. Do you think i have to adjuste the air screw on the carburetor or is that just what 2 stroke is all about? And there is one more thing, when i have the gas throttle on fast the motor is having trouble holdning a constant pace, it feels almost like its choking. Im very new to this so i feel i need to ask someone and i thought of you! Hope you having a nice day! Sincerley V
I just bought the same outboard for $100. It came with the original gas tank and a storage stand. The guy want 300 but it wouldn't start. I couldn't figure out how to turn the motor head and then I saw how you used a drill. Wah La. I have sparks. Now to figure out how to get fuel in.
I've noticed that you can put the top part of the carb (the "lid" that has the seat and needle) back in two different ways. Does it matter? The partnumber of the lid (1399-5808) should face forwards? You put it back the other way around...compare 19.39 and 38.01...
Just picked up one of these from a former coworker to put on my 1970’s Jon boat. He didn’t have much time to mess with it and it kept starting but flooding out after time.
I own three 2 stroke Mercs 4, 9.9 and 40 done pretty-much all to be done on them. Seems to me this four's missing at both idle and high speed. Could have a plug, plug gap, wire or possibly timing issues.
FYI if you don't already know .There is a place that has old Merc parts . It's www.oldmercs.com. If they have it (and they usually do) you can count on it being the correct part. Thanks for the good vids and sharing your vast knowledge.
Thank you I have the exact same motor. I was playing with it today . Water in the leg . Wouldn’t idle. I know now what to do, thank you Michael I appreciate ya awesome informative video. Can’t wait for the next one. How about A Evinrude 30 horse four stroke 75 LOL later Brother
I have a 1980 Mercury "Gnat" model 40 (4hp). I've had it on the water, it'll fire right up, run solid for about 10 mins then die as if its running out of gas. After two pulls, it'll fire right up and run for another 10 mins then die as if running out of gas. I can repeat this all afternoon. I have a new external tank (yes vent is open), new fuel hoses to the motor, new primer bulb, the carburetor has been removed & rebuilt, all new fuel lines put in. It was suggested to me that the motor may be getting too hot causing the motor to shut down. it spits water, but my next move is to replace the impeller/water pump. also suggested to replace coil. Any ideas as to what may be causing this condition? Maybe the fuel pump? Thanks, BW
Hi, Thanks for the video. I have the same motor. Your video helped me to install new water pump. Have another issue now, no spark. Could you please recommend me what to to with this motor. Thanks
I just picked up a 4.5hp mercury that is built very similar to this! Where do you typically order your parts? Thanks for the video. It definitely helped because I have to do the exact thing with water impeller
Great video. I have two of the 4 hp mercs I got with a jon boat. One is a parts motor. On the one I am working on, I got it to start and run and am still messing with the water pump which did not come apart as easy as yours. I do have another question about the clamps that hold the motor to the transom. Is there an easy way to separate the large washer from the end of the bolt to swap it out? The molded part of the T handle is gone and all that is left is the thin metal rod which is bent up. Thanks.
Can you tell me about the efficacy of using a drill to start the motor. I have a 9.8hp and worried about it snapping or stopping suddenly and messing my wrist up. Much torque?
It appears he installed the fuel filter and delivery housing seat 180° out of alignment. I've been searching for the correct alignment for that hole which serves as an overflow port and I think it's a vapor lock as well.seen several carb rebuild videos and nobody addresses this?
I'd go with a slightly bigger hole for the water flow , but knowing that it shouldn't be too much bigger because you don't want it to outrun the heat removal ! Maybe a 1/4 " or so !
Hello excellent video by the way - i have a very old honda BF15A that has seen better days but runs well except now i have water in the lower unit oil - the serial or frame number has been painted over a few times and is now completely illegible - my question is if i pull the lower unit apart to get to the pump seals and prop shaft seals will i be able to see numbers on the parts to enable me to buy spares....thanks
I haven't seen any part numbers on the parts. But usually you can look for numbers on the power head, stamped into one of the aluminum round plugs on the block. I just recently had the same thing on my 25hp johnson I am working on. I think I will add this information to its' video. Thank you for the great idea
Thanks for the video, I had my Dad's old Merc 40 in my shed for years and never used it. You gave me enough information and confidence to pull it apart. Two questions, I can't seem to get the lower section of the water pump off. Is there a trick to that? Also, I drained the gear oil which unfortunately had some water in it. How much gear oil should I add back in?
Lower section can fit very tight. Proceed with caution. There are two holes. One at the top and one at the bottom. You pump in from the bottom till it comes out the top.
Did you clean the points and check the ignition system? When you were doing the spark test looked a bit weak and intermittent. Also check somebody didn't use resistor wire on it. Mercs love the old school plug wires
I have almost this exact motor, came to me free from a customer at Atlantic Beach, NC. Do you have the information I may need to be able to order parts for it. I’m going to run through all the things you ran through, but I know for sure it needs a new fuel adapter(if that’s the right term)?? New to boating!!
Can you do a tutorial on either of these two motors 1974 or 1975 where you join the leg onto the motor to show how to fix problems with gear shift when it is not in the right position to line up in correlation with the selector on motor I've spent hours trying and I'm not keen to pull the whole thing to bits. It would be an awesome video as so many people have problems with it. My problem is in reverse the sharft is engaging both ways clock wise and ccw. When it's in forward gear it's in reverse it doesn't matter how many times I try to adjust the shift rod same outcome or I can't even get movement on the gear leaver any help from anyone would be much appreciated.
I had the same Mercury identical to the one year working on not sure what year it is was wondering where you got the fuel pump diaphragm kit and also carb rebuild kit for one of these Mercury 4 horse. Also what size fuel connector/ line do I need for this. the female end that plugs into the motor
Just taking a shot here. I have an early 70s 4 hp mercury with no model number. I'm in need of a fuel line hose connector to the motor. Somewhere I read the number is on a "freeze plug" but I don't know if there is one on this motor or where to find it if there is. Any ideas...........
You did a very good job on bringing the motor back to life. I have a motor just like that with fuel problems, having problem getting the fuel pump rebuild kit. Great job you did, do you do it for a living?
You certinally can I turned my 8hp Johnny into a 15 she pures like a pussy cat and certinally noticed the difference but here in aus parts are easier to find I will admit I've paid to have outboard wreckers in other states post me parts if they where hard to find anyways good luck with it
@@64samsky I've done a 9.9 Johnny but it's the same engine as the evinrude but that's for year models 1974 - 1992 if you'd like I can try find my notes an put in detail what I did should still have them in the shed xD you might need to double check with parts you need as you most likely need different parts but the processe should be pretty much the same anyway good luck with it there great little engines when you take care of them
Good video. I’m currently working on a 4.5 hp Merc with water pumping problems. But what did you end up doing with the water tube that runs up to powerhead? Was it bent, or did you just put it back up in place? I know it goes into a rubber grommet with a hard plastic top that mates to the powerhead. Thanks. Rick
Nice video.. I have the same motor.. A bit newer perhaps.. marked 4.5 .. Replaced the leaky fuel line with the factory part and no start.. Gonna take a look for kinks when the weather gets better... Any idea how long you cut that fuel hose? +++
@@Michaelsbackyardmarina .. also, just helped a buddy with his Suzuki 2.5 four stroke. Not running properly, hard to start, after just paying an engine service center hundreds of dollars to service carburetor. The carburetor was full of crap, the float valve was stuck closed, the idle jets totally plugged, the carb had not been opened! Incredibly, the engine is sold without a fuel filter! It now has an in-line filter! Amazing!
Hi great video i'm from New Zealand and have just bought one of these motors and would like to know how i can source parts, because it seem to be tired up with dealers here, i asked a couple and they wouldn't sell me them. I would like to know which is the best site for me to go for a parts list. Can anyone help please?
Its missing choke knob, fuel attachment for the tote to plug into and they ran the fuel line straight to the pump which has caused the line to bend and crack with not enough fuel getting in and i can't seem to fit the cowling back on is there a certain nack to it, i noticed one of the leavers is a bit loose. excuse the lack of terminology.
I have a 4.5hp which looks the same as yours, but mine does not push that much water even though I changed the impeller. It spits out hot and pretty much boiling water. I don't want and also I can't take it apart to clean the insides... The bolts are rusted to hell and to find new gaskets is going to be trouble in my country.. It runs great but the only problem is the cooling.. Any tips or tricks on how to clean the inside ? My guess it was used on salt water but never flushed out and left there sitting in the garage for a long time..
@@Michaelsbackyardmarina So far I had to completely disassemble all around the cooling pathways and clean it manually. Man oh man there was a LOT of junk there... Whole system was filled with limescale, salt deposits, rust and random junk.. Now I have a another problem haha.. All of the bolts that we're holding the plates which lead to the cooling system are broken since they've been rusted to hell.. Gonna try to find some other bolts and fit them and hopefully it will run a lot cooler :)
Hey I love your channel, I have a 1965 mercury 650 Thunderbolt. It turns on great and goes into first when using the ear muffs but won’t shift into first without stalling on the water. I think the seals when bad in the lower unit. Is this a problem you ran into before?
Great video! I know this is a Merc video, but I have a 76 Johnson 9.9 that won’t pump water out of the exhaust relief. I replaced the water pump and thermostat, and the head stays cool. Any suggestions on where to start looking first for any blockages?
So if head stays cold I would check the pisser pipe and elbow. Blow some compressed air up it while the motor is running. About 20psi. Spiders and wasps love to build nests in there.
I just picked up a 68 39 merc.outboard for 40 bucks guy had it apart and no idea what was wrong with it so know i have two opitions 1. Fix it 2 parts motor
Hey loved the video, do you have the link or could you tell me where you got the fuel pump diaphragm kit? I got this little guy for $20 and I can’t find the diaphragm anywhere!
Where can I buy this fuel pump ? I cannot find one anywhere!. I bought this exact engine in hopes to bring it back to life once more. Any help would be much appreciated Thanks
I wonder if you had changed the position of the fittings on the old new hose if that would have alleviated the kink in fuel line? Just a thought. Great video! Again!
Where do you order your parts and where do you find the part numbers? I just got a Merc 6 hp 1966 and I’m having fuel delivery problems too. I think it’s just the connector to the motor but can’t find where to get a new one?
you can't bet a older Mercury my first outboard was a 5hp mercury and i have been a mercury guy till about 10 years ago i got a 5hp 4 stroke and they are not the motor they where.
@@Michaelsbackyardmarina thank you so much. I am so glad and grateful I came across your video. I plan on using as a guide to try to extend the life of my little motor. I runs, but last oil change water in the lower oil. I am planning on a replacing gaskets, impeller, and clean carburetor, new plug. do you have any other suggestions. You can't even buy a new 25" small motor right now. Again thank you so much.
Excellent video, I just purchased 1983 mercury 4.5hp hasn't run in years can't wait tear into it.$ 200.
I found this video after someone gave me a 1970 mercury 40 4hp. This helped me a lot because he gave it to me because he couldn’t get it to run more than a couple of seconds. After watching this video I have it running like a champ now. Putting it on my 1232 jon boat soon and river testing it.
Awesome, glad it helped, thanks for watching
I have the same motor. Been looking for a video like this for a while now I’m heading to the garage!
I enjoy learning from your videos and your correcting the mistakes others have made prior to you owning them. THANKS
Glad you like them!
I'm loving your videos. I bought a little seamaid boat that came with a trolling motor and a 15hp evinrude for 300. I just about got her going without having to put too much money into it. These videos give me more confidence in working on my own outboards. Much appreciated!
Right on!
Doing a '73 20hp Merc now
Complete restore lots of fun, love those old Mercs, great videos!! Amazed at how 49 year old parts are still in great shape. Carl is Proud.
Hell yeah I’m on a 1968 110 9.8hp. Loving the craftsmanship and no nonsense design. And copious use of metal instead of plastic
I like the dirty and real way you put these videos together. Don't edit the video to make it look like you're a wizard, show the mess, show the little mistakes that you can correct given a little more poking. Speeding up the carb rebuild with notes was well done.
Thank you
I just wanted to say thank you! I have a1969 4hp and although it’s slightly different, your videos helped me completely rebuild it and it’s been running great on the water for. A few weeks now! Thanks for the info and encouragement!
Great to hear! Thanks for watching and commenting
I have a 1969 4hp I just was given any links for oil change and water pump impeller,spark plug? Thanks
This is exactly what I needed. I have a 1979 4.5 and it's identical. Now mine starts on the first pull. Parts are expensive when you can find them. Thank you!
I really enjoy your videos. I have a 78 9.9 Johnson that I have running now because I’ve watched your videos. Thanks and keep doing what you are doing.
Thanks, will do!
I liked the notes and great close ups on the carb work.thanks for the video!
Glad it was helpful!
Hi, thanks for the video. I have 2 of these engines that both need a carb and pump rebuild. This is the only video i can find anywhere on how to do it. Excellent detail on how to do it too, again, thank you, you have saved 2 old mercury engines here in northern ireland
Glad I could help
I just bought a Mercury 4.5, looks like it’s from the 80’s for $50. Looks exactly the same as yours. Very nice shape. I’ve been messing with that choke lever for the past 45 mins, and I thought, I’ll look through your old videos to see if you’ve done one, low and behold, your tip just saved me breaking the choke lever off. Thank you. Love the vids.
Great to hear. Thanks for watching.
I just bought 1 too :) , im checking the manual on internet and i cant find, what kind of oil use the transmission , should i put mineral oil? haha
i got the same motor and the same issues thank you, Michael for the learning experience
Glad it helped
Just have to say great video i just bought a 73 40 hp merc.for 25 brought it home stuck her in the tank and put fuel to it 4 pulls and she started right up
Holy smokes that is awesome.
Sorry I thought you had a 4hp otherwise known as a 40. I don't have a hood for that.
@@Michaelsbackyardmarina ok if you come across one please let me know i do have a 4 hp known as a 40
mate I have to admit this is one of the best tutorial iv seen, I have this engin in my living room and about to redo the carb, thanks youve just made it easy. rgds from Montreal
Glad it helped. Thank you for watching and commenting.
Just brought 1 the same for $40 !! only a red band - after watching your video can’t wait to crack it open and go through it and get it running
Cheers from Tasmania
Best of luck to you. It's fun to get the old ones running
This is a very helpful tutorial, I followed it step by step, and added my own personal touches as well. Very good video and got my motor running. You are going to hit your own kinks down the road but it is up to you to figure it out! Glad mine is back to life, I got it for free and put less than a $100 in it. You can see a running video in my shorts. Thanks!
I will also add that if your motor has had life in saltwater, this road will be a little bit more difficult for you as was mine. But this is a fantastic reference and overall step by step to guide you.
I just bought this motor, and I’m currently using this video step by step
Make her run again
Where did you order the parts? I found old merc parts the site but what do you recommend? Mine seems mechanically sound, but it’s not spitting so I am gonna have to do the impeller so I’m gonna be ordering parts tonight
Great show !! Thank you for showing how to get the 4 hp Merc running I just got almost the same Merc 4.5 hp but I need to do the same fix you did to your 4.0 hp. super good video.
You can do it!
Awesome videos! I could watch u do this all day
Wow, thanks! really do appreciate the kind words.
Perfect trolling motor. Another fine job Mike.
Yes it is, Thanks for watching
I just picked up a 1960 6hp last maintained like that in 1987 can't wait
Have some fun with it. thanks for watching
@@Michaelsbackyardmarina I'm not expecting it to run
I could mentally smell the exhaust off of that Evinrude engine!😁 what memories as a preteen growing up on water! And I am 66 years old now! 😁🛫
smell is one of the memory triggers for sure, thanks for watching
GREAT VIDEO, THANK YOU Prof . Outboard
Glad you enjoyed it
Was this an intended pun - a 2 stroke Merc "smoking" deal? They DO smoke and I do love them. You have the patience of a saint when you continue to answer nicely on the 37th question about where you buy your parts from. C'mon people. read the comments, then ask if it isn't already answered! By the way, you probably figured out that the little square bolt that holds down the shift shaft seal is a 13/64ths. Have you ever seen one of these 70's Mercs that runs counter clockwise? My 1972 Merc 40 4 HP does. Impeller vanes have to face the other way.
I am known around my circle of people as the king of puns and dad jokes, thanks for watching
I really like your stainless steel work space.
Thank you!
Carbs have always been a thorn in my side . BUT... now, I guess I need to get a couple outboards out of the barn and tinker with them. I have a 9.8 Merc, 9.9 Merc and a 15hp Gamefisher. One of the Mercs ran when put up and the Gamefisher needs a new recoil assembly. I can test them in a tank similar to yours and on my 14' rowboat that I'm making into a small bass boat. Good luck fishing. Oh yeah, let me know if you got the pics of the Glasspar.
got the pics. Thank you
Warning it can get addicting. Just this summer 1 surfjet 84, 1 1968 AquaFun mini boat. 1 62 Owens Ski Boat a 55 LakeCraft Demon cedar strip and about 30 small motors all under 100hp lol wife ready to kill me lol
Love the old Mercury, I just pick up a 73 4hp it started but I shut it off wasn't pumping water I got an impeller it's going in today I hope I have good luck with this Mercury
Sounds great!
Love it when you find it's something simple/stupid.
indeed. thanks for watching and commenting
Nice Work and good instructions on how to! A big thank you from Sweden!
I got my own Mercury 1977 outboard that need a new impeller :) now I know how!
🙏
Glad it helped
@@Michaelsbackyardmarina Hi there again! I have some issues with my 1977 mercury 4,5hp 2 stroke. when i have the gas throttle on shift mode, the whole motor is vibrating a lot and the sound from the engine is not consistent. Do you think i have to adjuste the air screw on the carburetor or is that just what 2 stroke is all about? And there is one more thing, when i have the gas throttle on fast the motor is having trouble holdning a constant pace, it feels almost like its choking.
Im very new to this so i feel i need to ask someone and i thought of you!
Hope you having a nice day!
Sincerley
V
Picking this exact model up today. WIll be using this as reference
perfect, that is why I do what I do, thanks for watching
I just bought the same motor for a $100 and it runs great with zero issues. Figure I will quadruple my $$$ without doing a darn thing to it.
excellent
Great video, I liked the content and music 👍🐟
Glad you enjoyed
Nice. I just found a nice 7.5 for my 12ft aluminum
Any videos on timing that engine?
Thanks for this rebuild info. I have one that's free. The wiring, white, green and black from stator is bad. Carbs, impeller, and fuel pump next.
Sounds like you got this, keep it up. Thanks for watching.
I know this is a older video but can you make one on the ignition system
I just bought the same outboard for $100. It came with the original gas tank and a storage stand. The guy want 300 but it wouldn't start. I couldn't figure out how to turn the motor head and then I saw how you used a drill. Wah La. I have sparks. Now to figure out how to get fuel in.
you can do it, thanks for watching
Nicely done sir!
Thank you kindly!
Excellent! Could you please provide your parts source? Thank you!
I've noticed that you can put the top part of the carb (the "lid" that has the seat and needle) back in two different ways. Does it matter? The partnumber of the lid (1399-5808) should face forwards? You put it back the other way around...compare 19.39 and 38.01...
Great video! I just picked up a 4.5 Merc. What octane gas should I run?
Just picked up one of these from a former coworker to put on my 1970’s Jon boat. He didn’t have much time to mess with it and it kept starting but flooding out after time.
I bet you can fix it and get it running right.
Really cute little motor. Need that one for my kayak...
Yes you do
No...you need an tummler engine😉
That's a good runner! I'll bet it's practically new in the insides as far as wear.
I own three 2 stroke Mercs 4, 9.9 and 40 done pretty-much all to be done on them. Seems to me this four's missing at both idle and high speed. Could have a plug, plug gap, wire or possibly timing issues.
FYI if you don't already know .There is a place that has old Merc parts . It's www.oldmercs.com. If they have it (and they usually do) you can count on it being the correct part. Thanks for the good vids and sharing your vast knowledge.
yes sir, I have ordered from them several times
so my recoil spring broke on my 4.5, i'm using the same "electric start" you are! powerdrill to the rescue
Good video, keep um coming.
Thanks, will do!
Thank you I have the exact same motor. I was playing with it today . Water in the leg . Wouldn’t idle. I know now what to do, thank you Michael I appreciate ya awesome informative video. Can’t wait for the next one. How about A Evinrude 30 horse four stroke 75 LOL later Brother
Glad I could help
Say Mike could you tell me where you order your parts from.rather order on line.
I have a 1980 Mercury "Gnat" model 40 (4hp). I've had it on the water, it'll fire right up, run solid for about 10 mins then die as if its running out of gas. After two pulls, it'll fire right up and run for another 10 mins then die as if running out of gas. I can repeat this all afternoon. I have a new external tank (yes vent is open), new fuel hoses to the motor, new primer bulb, the carburetor has been removed & rebuilt, all new fuel lines put in. It was suggested to me that the motor may be getting too hot causing the motor to shut down. it spits water, but my next move is to replace the impeller/water pump. also suggested to replace coil. Any ideas as to what may be causing this condition? Maybe the fuel pump? Thanks, BW
Hi, Thanks for the video. I have the same motor. Your video helped me to install new water pump. Have another issue now, no spark. Could you please recommend me what to to with this motor. Thanks
Watch more videos and check out oldmercs.com
hey man anyway you can show me or tell me how to take the propeller off on this exact motor
I just picked up a 4.5hp mercury that is built very similar to this! Where do you typically order your parts? Thanks for the video. It definitely helped because I have to do the exact thing with water impeller
Are these motors generally harder to turn the throttle on? Im used to newer ones that have sterring thays cable driven and not gear driven
Where you get your parts? Great video bro
I just got a similar year motor but I am struggling to get it working any tips I have a small clip of it running
Is there an o ring that is supposed to go on the end of the drive shaft ?
Thanks for uploading! Took the leap and tried to make my own video on a 15 horse Evinrude. It’s up on my channel.
There you go. Great start to your you tube world. Study other videos that are performing well and take notes on what they do well
Great video. I have two of the 4 hp mercs I got with a jon boat. One is a parts motor. On the one I am working on, I got it to start and run and am still messing with the water pump which did not come apart as easy as yours. I do have another question about the clamps that hold the motor to the transom. Is there an easy way to separate the large washer from the end of the bolt to swap it out? The molded part of the T handle is gone and all that is left is the thin metal rod which is bent up. Thanks.
I haven't done one of those clamps on the old mercs.
Can you tell me about the efficacy of using a drill to start the motor. I have a 9.8hp and worried about it snapping or stopping suddenly and messing my wrist up. Much torque?
It appears he installed the fuel filter and delivery housing seat 180° out of alignment. I've been searching for the correct alignment for that hole which serves as an overflow port and I think it's a vapor lock as well.seen several carb rebuild videos and nobody addresses this?
Thanks for the info!
Where can I find the choke screen that connects to the choke switch on the inside?
I'd go with a slightly bigger hole for the water flow , but knowing that it shouldn't be too much bigger because you don't want it to outrun the heat removal ! Maybe a 1/4 " or so !
Well , I should have watched some more of the video ! Ha ha ! That's about the size I'd have done ! Perfect !
No worries. Thank you for watching and commenting.
Nice looking motor, cute little 4 hp.. looks like you need to find a smaller test boat!!
It's actually a '74. In '75 it was the 4.5 hp Merc 45 because they were setting the stage for the '76 2 cylinder 4 hp.
Quick question, where do you order your parts from?
Are all of the 4hp Mercury's 2 stroke and how do you tell the difference
Hello excellent video by the way - i have a very old honda BF15A that has seen better days but runs well except now i have water in the lower unit oil - the serial or frame number has been painted over a few times and is now completely illegible - my question is if i pull the lower unit apart to get to the pump seals and prop shaft seals will i be able to see numbers on the parts to enable me to buy spares....thanks
I haven't seen any part numbers on the parts. But usually you can look for numbers on the power head, stamped into one of the aluminum round plugs on the block. I just recently had the same thing on my 25hp johnson I am working on. I think I will add this information to its' video. Thank you for the great idea
@@Michaelsbackyardmarina great thanks for your quick reply - keep fixing them up - they still have life lol
Thanks for the video, I had my Dad's old Merc 40 in my shed for years and never used it. You gave me enough information and confidence to pull it apart. Two questions, I can't seem to get the lower section of the water pump off. Is there a trick to that? Also, I drained the gear oil which unfortunately had some water in it. How much gear oil should I add back in?
Lower section can fit very tight. Proceed with caution. There are two holes. One at the top and one at the bottom. You pump in from the bottom till it comes out the top.
To remove the bottom of the water pump housing you simply lift it out of place straight up. It’s pressed in and has an O ring seal
Did you clean the points and check the ignition system? When you were doing the spark test looked a bit weak and intermittent. Also check somebody didn't use resistor wire on it. Mercs love the old school plug wires
Yes I did. Had it out on the water and it performs as expected
I loved your video! Great job. where are you able to find parts? I have a 1975 7.5, and I need a carb kit.
can I buy that through you?
What size are those fuel line fittings with a hose barb?
Thanks for sharing
Thanks for watching!
Excelente video
thank you and thanks for watching
I have almost this exact motor, came to me free from a customer at Atlantic Beach, NC. Do you have the information I may need to be able to order parts for it. I’m going to run through all the things you ran through, but I know for sure it needs a new fuel adapter(if that’s the right term)?? New to boating!!
oldmercs.com or marineengine.com
Can you do a tutorial on either of these two motors 1974 or 1975 where you join the leg onto the motor to show how to fix problems with gear shift when it is not in the right position to line up in correlation with the selector on motor I've spent hours trying and I'm not keen to pull the whole thing to bits. It would be an awesome video as so many people have problems with it. My problem is in reverse the sharft is engaging both ways clock wise and ccw. When it's in forward gear it's in reverse it doesn't matter how many times I try to adjust the shift rod same outcome or I can't even get movement on the gear leaver any help from anyone would be much appreciated.
Just found your channel you have really good content!
Welcome aboard! and thank you
Great video. Were the parts readily available "
Yes they are
I had the same Mercury identical to the one year working on not sure what year it is was wondering where you got the fuel pump diaphragm kit and also carb rebuild kit for one of these Mercury 4 horse. Also what size fuel connector/ line do I need for this. the female end that plugs into the motor
go to oldmercs.com and you can find some parts for the old mercury's there.
Just taking a shot here. I have an early 70s 4 hp mercury with no model number. I'm in need of a fuel line hose connector to the motor. Somewhere I read the number is on a "freeze plug" but I don't know if there is one on this motor or where to find it if there is. Any ideas...........
Check out oldmercs.com
You did a very good job on bringing the motor back to life. I have a motor just like that with fuel problems, having problem getting the fuel pump rebuild kit. Great job you did, do you do it for a living?
Playing around with boat motors is a hobby for me. Thanks for watching
Hi my friend from RMD Creations channel, thanks for all the info I'm wondering if we can turn a Johnson 9.9 into a 15 ? Thank you.
If I come across the right parts for the right years I certainly will. 15 hp carbs are hard to come by
You certinally can I turned my 8hp Johnny into a 15 she pures like a pussy cat and certinally noticed the difference but here in aus parts are easier to find I will admit I've paid to have outboard wreckers in other states post me parts if they where hard to find anyways good luck with it
I have a 1969 Evinrude 9.5 that I want to do the same thing too.
@@64samsky I've done a 9.9 Johnny but it's the same engine as the evinrude but that's for year models 1974 - 1992 if you'd like I can try find my notes an put in detail what I did should still have them in the shed xD you might need to double check with parts you need as you most likely need different parts but the processe should be pretty much the same anyway good luck with it there great little engines when you take care of them
@@calebmarshall3356 I'd be very interested in that, thank you!
Good video. I’m currently working on a 4.5 hp Merc with water pumping problems. But what did you end up doing with the water tube that runs up to powerhead? Was it bent, or did you just put it back up in place? I know it goes into a rubber grommet with a hard plastic top that mates to the powerhead. Thanks. Rick
I just put the tube back in.
Nice video.. I have the same motor.. A bit newer perhaps.. marked 4.5 .. Replaced the leaky fuel line with the factory part and no start.. Gonna take a look for kinks when the weather gets better... Any idea how long you cut that fuel hose?
+++
Be interested to see if that is what it is.
So much for taking engines to “certified” marine mechanics! Exactly my experience from the past! They couldn’t fix it but I did for $2……..
There you go....in charge of your own destiny.
@@Michaelsbackyardmarina .. also, just helped a buddy with his Suzuki 2.5 four stroke. Not running properly, hard to start, after just paying an engine service center hundreds of dollars to service carburetor. The carburetor was full of crap, the float valve was stuck closed, the idle jets totally plugged, the carb had not been opened! Incredibly, the engine is sold without a fuel filter! It now has an in-line filter! Amazing!
Hi great video i'm from New Zealand and have just bought one of these motors and would like to know how i can source parts, because it seem to be tired up with dealers here, i asked a couple and they wouldn't sell me them. I would like to know which is the best site for me to go for a parts list. Can anyone help please?
Its missing choke knob, fuel attachment for the tote to plug into and they ran the fuel line straight to the pump which has caused the line to bend and crack with not enough fuel getting in and i can't seem to fit the cowling back on is there a certain nack to it, i noticed one of the leavers is a bit loose. excuse the lack of terminology.
I have a 4.5hp which looks the same as yours, but mine does not push that much water even though I changed the impeller. It spits out hot and pretty much boiling water. I don't want and also I can't take it apart to clean the insides... The bolts are rusted to hell and to find new gaskets is going to be trouble in my country.. It runs great but the only problem is the cooling.. Any tips or tricks on how to clean the inside ? My guess it was used on salt water but never flushed out and left there sitting in the garage for a long time..
If it has been in salt and has some blockages. I don't know of anything you can do.
@@Michaelsbackyardmarina So far I had to completely disassemble all around the cooling pathways and clean it manually. Man oh man there was a LOT of junk there... Whole system was filled with limescale, salt deposits, rust and random junk.. Now I have a another problem haha.. All of the bolts that we're holding the plates which lead to the cooling system are broken since they've been rusted to hell.. Gonna try to find some other bolts and fit them and hopefully it will run a lot cooler :)
Hey I love your channel, I have a 1965 mercury 650 Thunderbolt. It turns on great and goes into first when using the ear muffs but won’t shift into first without stalling on the water. I think the seals when bad in the lower unit. Is this a problem you ran into before?
Definitely something a little a miss there. I would google or search you tube " Dies under a load for Mercury 650"
Great video! I know this is a Merc video, but I have a 76 Johnson 9.9 that won’t pump water out of the exhaust relief. I replaced the water pump and thermostat, and the head stays cool. Any suggestions on where to start looking first for any blockages?
So if head stays cold I would check the pisser pipe and elbow. Blow some compressed air up it while the motor is running. About 20psi. Spiders and wasps love to build nests in there.
I just picked up a 68 39 merc.outboard for 40 bucks guy had it apart and no idea what was wrong with it so know i have two opitions 1. Fix it 2 parts motor
Sounds like a good time. Fix it or part it, that is the real question.
Hey loved the video, do you have the link or could you tell me where you got the fuel pump diaphragm kit? I got this little guy for $20 and I can’t find the diaphragm anywhere!
marineengine.com
RMD Creations thank you!
Where can I buy this fuel pump ? I cannot find one anywhere!. I bought this exact engine in hopes to bring it back to life once more. Any help would be much appreciated Thanks
Check out oldmercs.com or marineengine.com
Grate job
Just picked up a 4 horse Mercury along with a 12' alumacraft boat and trailer for $100 lol.
I wonder if you had changed the position of the fittings on the old new hose if that would have alleviated the kink in fuel line? Just a thought. Great video! Again!
I thought about that after the fact....it may have fixed it.
RMD Creations you are our inspiration! Keep up the good work. God bless
Where do you order your parts and where do you find the part numbers? I just got a Merc 6 hp 1966 and I’m having fuel delivery problems too. I think it’s just the connector to the motor but can’t find where to get a new one?
oldmercs.com
That’s a great site, got everything I needed.
Hey where did you get the new lean or rich knob I need one for my 76 Evinrude 15hp....
marineengine.com or ebay are your bet bet.
you can't bet a older Mercury my first outboard was a 5hp mercury and i have been a mercury guy till about 10 years ago i got a 5hp 4 stroke and they are not the motor they where.
Thanks for watching
I have same motor, how were you shutting it off? With choke? I have to disconnect gas and wait until runs out of gas to turn off. Thanks
Choke to kill it.
@@Michaelsbackyardmarina thank you so much. I am so glad and grateful I came across your video. I plan on using as a guide to try to extend the life of my little motor. I runs, but last oil change water in the lower oil. I am planning on a replacing gaskets, impeller, and clean carburetor, new plug. do you have any other suggestions. You can't even buy a new 25" small motor right now. Again thank you so much.
Do you know where I might could find a lower unit for this similar type of motor. I have a 1969 merc 40 4hp
keep you eyes open on eBay