How to remove the lower unit on a Mercury outboard motor
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- This video will show you have to remove the lower unit and change the water pump impeller on a Mercury outboard motor. I did this on a 1984 20hp Mercury electric/manual start. If you have questions or need help and want me to make a "how-to" video for you, just comment below and I'll try to help you out as fast as I can. Thanks for watching! :)
If anyone has any questions, it's a lot better and easier to contact me through my Facebook page Outboard Madness. I'm currently moving to my new location and I'll have new vids and pics as I'm working on motors. Please send any vids, pics, comments on my FB page and I'll be in touch as soon as possible. Thank you all again.
I just spent the better part of the afternoon trying to figure out why my lower unit won't drop. Just got home and found your video. Thanks so much for posting this. My motor looks just like yours and now it all makes sense. I will have another crack at it tomorrow.
Thanks again for taking the time to make this!!!!
Edward Wade no problem, anytime. If you have any questions please feel free to message me on my FB page Outboard Madness. Happy this video helped so many people. :)
If anyone has any questions, please message me on my business page. I'll post a link below. I have lots more pics and vids of motors that I work on daily.
facebook.com/OutboardMadness/
So glad I found this video. We tried changing the impeller on my 25 HP on weekend but the lower unit wouldn't come off and was about to take it to shop. Didn't realize had to remove the screw to the shift link. You saved me a pile of money. Cheers and thanks again.
No problem. I'm happy that this video helped so many people save time and money. I need to make more vids. lol
Thank you so much for taking the time to pass on your experience. Been scratching my head over the shift-link aspect!
My pleasure! Check out my business page, I'll put a link below. I post up working on outboards daily on there. If you EVER have any questions about any outboard, please feel free to ask. 👍🏼
facebook.com/OutboardMadness/
Thanks for this video, couldnt figure out why the lower on mine would only drop a few inches until i saw this.
Now we will just hope it goes back on easily!
I am sure that this video may pertain to SOME Mercury outboard engines, however I'm glad I preceded to another video when I saw you were working on a smaller engine. Mine was much easier, just removing 5, 15mm nuts and washers after draining the lower unit oil. My engine was a 2002 75hp 2 cycle.
MARINER 25HP MYSTERY SOLVED.This was just great. I have an Australian Market Mariner 25hp. It has the same configuration for lower case and most important to find were to disconnect the shifter. Thanks for this video buddy.
Thank you for the video! I have a 1978 20hp Mercury and just lost the anode. Is there any way to replace it easily without having to remove the lower unit? Any advice is welcome. Thank you!
Picard 80 send me a pic on my Facebook page Outboard Madness
This is what intrigues me: I see the bolt that is used to secure the anode. As seen on your video, there is a little hole in the lower unit right over this bolt. I just don't think I can fit an helix key through that hole to tighten the bolt on the anode. Would be perfect but hole seems too small. What do you think?
Picard 80
My cell is 707-342-4072. Call or text me. Or you can message me on my Facebook page Outboard Madness. Just Google Outboard Madness and I'm the 1st one that pops up. I can help you more better through my cell or my Facebook page.
thanks for the video,went to drop the leg on my 1998 25hp merc us model, then saw the shiftier shaft ,now i know how to disconnect it
No problem. :)
Thanks for posting the vid. Mine was just a minor bit different but it got me out of a jam. Excellent. Thanks again.
Chuck Porter - Everything Outdoors. Yessir, anytime! Ya, some have the type that have a tab and you get a flathead to lift that tab up and then get it out that way. If you ever have any questions about any outboard, feel free to ask. Check out my Facebook business page Outboard Madness. 👍
Thanks dude, your video showed the linkage disconnect. No other video for a Merc showed that. Thumbs Up. Cheers.
Pete Frederick anytime. If you ever have any questions, please feel free to ask. Check out my buisness page Outboard Madness. I work on a lot of motors and have more vids and pics and discription of work being done. Happy New Year!
I just reinstalled the lower unit on my 18xd and reconnected the shift rod but when I turn the shifter to forward or reverse the rod isn't going up or down. Is it only supposed to move up and down while the motor is running, is something broken, or did I just not connect it right. I pushed the pin back through the rod and reinstalled the screw while in neutral.
Thanks
great video... ive got a 1999 25hp mercury that when in reverse jumps out of water and when in F or N its locked. iv heard theres a trick to putting the lower unit back on correctly for it to lock in R and be unlocked in gear incase of underwater obstruction. thanks for any advice.
Great video. I'm about to change my leg from a long to an extra long. It's a brand new tohatsu. Stupid question, do i have to drain any fluids first?
Thanks so much for posting this I was at a loss trying to figure that darn thing out, You rock buddy!!
Thank you! :)
Thank you for the awesome video. I've a 1985 Mecury 50HP, model Model Number 1050525, serial A158413. Do u think the way to detach the shift linkage is the same yours, where the shift linkage seemed to reside behind the carburetor?
Following
Taking propeller off and when I put it back on I dropped the carter pin down into the lower shaft. Can that damage anything? Do Ineed to take it apart to remove it
Thanks. My 8.0 was a little different but similar enough that this vid made it like I'd removed it before. That top rod connector was the part I was overlooking. Wish it was as clean as yours. Mine was a total pig inside there.
I'm happy that this video helped you. 😊
I have a 9.9 hp Mercury 4 stroke...I removed the bottom 4 screws and dropped the unit about 6 inches, but it would not come completely off. Do i have to remove the screw from under the cowl also ? Thanks
I think that that one is like my 15hp Mercury. You still have to disconnect it from the top of the shift link rod like shown on this video, but that kind doesn't have a screw on the key. You just have to lift up on the front part of the key that faces towards the front of the motor and it will unlatch and then you can pull the key straight out. I used a flat head screw driver to lift the front of the key to unlatch it. Let me know if it works.
Good video, question...I have a 15hp Merc short shaft, can I convert it to a 20inch long shaft?
Yes, but you'd have to change the drive shaft, extension mid section, water intake tube, and shift link rod.
I have a 1983 40 hp the lower unit wont come off. Is it the same as the 84 that you worked on?
Nice video. I have the 1978 version on this motor. Anode got loose on lower unit and prop was touching it. Looks like back in position now but still a bit loose. How do you change the anode? Thank you
Picard 80
The anode should be attached by a bolt or screw. Just take it off and replace it. They are usually around $20 for a new one.
Thanks! I forgot I contacted you month ago. I just lost the anode today ... Any way to replace it without having to remove the lower unit? I see the bolt but can't access it to tighten the anode. Thank you!
I have a 1983 40hp mercury. Does the shift linkage/lower unit come apart the same way? Wanting to replace impeller, but not sure how to get there.
I'm pretty sure that on that motor, it'll just slide out once you take off all of the bolts on the lower unit. I think that there's 5 bolts on that lower unit that needs to be removed before you can drop the lower unit. Usually there's a hidden bolt under the trim tab, it kinda looks like a small skeg under the fin, but not sure if yours will.
Awesome video!!! I just acquired the same exact 20HP motor, had foot off in 10 minutes flat... thanks to your video! - Lower end oil looks like choco-milk, and she jumps gear at bout 1/2 throttle, guessing forward gear is worn maybe?
Happy this video is helping so many people. Might be an adjustment of you're lucky. These Mercury's have the shift connected to the throttle. If you turn it to much, it will go into gear.
Thanks for the video helpful. Down here in Australia. Running a 25hp Tohatsu. Thought your video might help in freeing up the steering via the tiller. It is very stiff. Looser after I tried to pack the shaft with marine oil through the top screw but still stiff. Any tips? Cheers from down under.
Anytime! :)
great video brotha let me ask you a question. my outboard was running fine but i decided to take off the lower unit and change the water housing and the impeller. i put the lower unit back in place but now i turn the key to start it and it makes no noise or even hear the choke engage nothing, its like the battery is dead. all the gauges work i tried it with three marine batteries fully charge and nothing. when i took of the lower unit i put i shifted it in forward and left it like that. could an unbalance shift linkage cause this or do you suspect is something else ? if you have any suggestion or ideas of what i can do before i take it to the pros and waster $$ on something i can fix or adjust by myself i would appreciate it . it a 2003 mercury 75 hp two stroke.
Check the key switch. Sorry for the late reply, I thought that I replied. Was looking through the comments and seen that I didn't. Again, sorry. Did you ever figure out what the problem was?
Rod Bending Addicts sounds like safety neutral switch out of adj
Would you know if this would be the same for an 8hp 1988 merc? looks like the identical motor, smaller of course.
It should be the same. This motor is a 1986.
I have an '87 Force 125. Is it the same process for removing the lower end as it is for the Merc?
I got same similar 25HP tiller short shaft approximate 92-95 Mercury .
I got the complete power head / ENGINE ALREADY off . ONLY THE HOUSING REMAIN . Shifting cable is free .
My lower unit still won't come off THE MID SECTION ! It's moving kinda tightly but won't slide out ! Something else I am Missing OR forgot to remove ?
HELP .... HELP..... HELP .
If the lower unit gear oil is a milky color, yes, you have to take off the lower unit to change all of the seals down there. One of the seals are under the water pump housing where the shaft goes into the lower unit.
I have a Mercury 6hp 4 stroke given to me for free. previous owner left it in water and the lower unit, and up half way the shaft cover is completely chewed away. Surprisingly i was able to undo the bolt , and then the entire shaft housing came apart. I just can't figure out how to remove the entire shaft to replace it.
Can we some how swap emails in a private message so i can send photos of my progress and point of reference?
Thanks for the video. I followed your instructions and now that everything is back in, the prop doesn't engage. The motor runs, it clicks normally in forward, neutral, reverse but prop doesn't spin. Any tip? Thank you!
Picard 80 did you connect the shaft link back to the shift rod?
BayArea D-BO I think I didnt screw the shaft deep enough into the housing. Also realized that you can also screw it a little too far in.
Picard 80 ya, that shift link rod screws/unscrews into the lower unit. I don't twist that shift rod once I drop the lower unit. I also verify that it's shifting like it should before bolting the lower unit back on. I'll put 1 bolt back in there to just hold it in place to test it, if everything is still good, then I completely bolt it back on.
Picard 80 with the lower unit off, you can pull up/push down on the shift rod to make sure it's shifting also.
BayArea D-BO Yes. All shift well now. I realize the screwing part and then tighten it as much as I could expecting this to have a hard stop - until the motor wouldn't start anymore ... Looks like you have to find the right balance between tighten the shaft too much and too little while ensuring it shifts. Hopefully I didnt break anything and all will work good. Thanks for your follow up!
I just looked a a 50 merury lower end was leaking water where it bolted to top end is this a problem?
I removed the lower unit from my 1986 25 hp but didn't disconnect the shift rod at the top. So does that mean I have to disassemble the lower unit to get the cam assembly, shift back in correctly?
Did you force it off? Send me a pic of it plz.
+BayArea D-BO I removed the shift rod from motor and put it in the lower unit. I was able to shift to Rev, N and For. Put the lower unit back on no problem So I think I'm ok. Thank you for your response and for the video as well.
No problem, that's good to hear.
That ring, at the end that you picked up and said not to lose... Where does it go?
Quick question, can I swap a 15" leg off of a 7.5 and install it on a 9.8 (currently a long leg). Both motors are the same vintage, early 80's im guessing
Yes, but you'd have to change the drive shaft, shift link rod, water intake tube, and maybe the midsection extension piece.
Ok that's what I thought, the drive shaft, shift link rod, intake tube that are already in the shorter leg should fit right in to the other power head right?
+Gagnon_21 Yep, you just have to transfer everything from one motor to the other.
sweet, Thanks!!!
I have a 2016 15hp 4stoke tiller handle …. How do take lower end off
will i have to , take lower unit off the whole motor just to change that, part, give your, opinion on that, ,
I have a question, do you have to change it to Forward on your gear or leave it in neutral, also last question should you lube the shift bar before you put it back ..thanks
Miguel Palacio on the motor in the video, it doesn't matter what gear it's in. The shift link rod just goes up & down to change gears. Beat to pull the shift link rod up and then side it back up to where it connects behind the carb. Twist the throttle so that the arm that pushes/pulls the shift rod is up. Found that works best with trying to line everything back up to connect it and move the arm up/down as needed till you can get that key lined up rite. No lube required.
Miguel Palacio check out my business page facebook.com/OutboardMadness/ I have a lot of vids and pics on there.
I do appreciated that very much, Also I have a question on Mercury(Mariner) 25 XD Throller cable adjustment as it's a Complicated Merc system..let me know if you post a video...or something to help on it. Thanks
Do you have any idea what lower unit Years would swap with my 1984 merc 25 hp, I found a 1995 merc 20hp just wondering if it would bolt up correctly. If not it’s cool
Derek Evans what's the serial number on your motor?
Message me on my Facebook page Outboard Madness. I have a lot of recent pics and vids of many more motors on there.
hello, i have a mercury 650 thunderbolt 1973, lower unit wont go off, water doesnt run thru engine. How can I open it to replace impeller? Please advise. B
Blaž Jarc message me on my FB page Outboard Madness. It'll be easier for me to help you.
I have mercury optimax 90. I need to change impeller but have a problem with dismantling lower unit. What can I do
Željko M. Send me the serial number
i have a 05 mercury 25 an dropped the lower unit first then released the top an its stuck and cant get it to release. Help!
The exhaust comes out through the center of the prop. That's just the left over burnt up oil from running the motor. All of the 2-strokes that I've ever owned does that. If you want to see if one of your lower unit seals are messed up, drain the lower unit gear oil and if it's a milky color, your seals are bad.
+Derp “Evil” Derpson You might have just messed it up too bad. Try to pry it off.
+Derp “Evil” Derpson No problem. :)
I have the same motor you show in this video and i am trying to find the right impeller any help would be greatly appreciated.
Deven Morgan What's the serial #?
will look when i get home it started with a B the year and the hp are the same as yours but mine is pull start
I have a 7.5 mercury that im trying to change the reverse lock cam on. The piece that turns and makes the reverse lock rod go up and down, do you have a video on how to remove it? Thanks in advance!!
FueledbyFishing don't have a vid, but can make one when I get some extra time. check out my Facebook page Outboard Madness. Just Google it and it'll pop up.
BayArea D-BO I'd appreciate the video and sure thing ill check out your page thanks again!!
FueledbyFishing no problem
is this motor similar to a Mariner? I have a mariner 25hp xd and need to change the impeller but not sure on how to go about disconnecting the shifting rod.
Jeremy Wurth. Ya, Mercury & Mariner is the same thing.
BayArea D-BO So it should disconnect the same way then. thanks man , I appreciate it!
Thanks searched high and low looking how to disconnect the shift linkage :)
Glad it helped you. ☺
i got a murcy 7.5 about a 78-79 lower unit , oil is comeing out of the propeller area, what main seal is that, , that needs changeing/
The exhaust comes out through the center of the prop. That's just the left over burnt up oil from running the motor. All of the 2-strokes that I've ever owned does that. If you want to see if one of your lower unit seals are messed up, drain the lower unit gear oil and if it's a milky color, your seals are bad.
If the lower unit gear oil is a milky color, yes, you have to take off the lower unit to change all of the seals down there. One of the seals are under the water pump housing where the shaft goes into the lower unit.
My motor will go in to gear. Forward and reverse. I can not seem to get the full power it had. Its next to nothing. Whats could this be. Please help
You should do a compression test on it. If it has low compression or if one cylinder has a lot more compression than the other one, you might need new piston rings, the cylinder walls might be scorn, etc.
If the compression is good in all cylinders, make sure that you're not getting an air leak in your fuel line somewhere. What year/make/hp is your motor?
how do I get the key out since I broke screw? please help
Any tips for swapping out a US Marine 85 hp lower unit?
I'd have to look at it. Can't say for sure though.
I cannot reassemble shift linkage, no room to attach linkage by hand.
so if a nut half way of shaft then thats the one to be removed, I was under the impression that I had to remove both
MAN YOU HELP ME A LOT GOOD JOB GOOD VIDIO
Anytime! :)
thanks for the video2 min in and it solved my problem
Will this work on a 25 hp mercury xd short shaft. I'm guessing the year is in the 80's.?
What's your Ser #? I can find out for you.
+BayArea D-BO
A147683
+Jeremy Wiebe Yep, same way as your motor.
+BayArea D-BO is there anyway u can tell me were to go to get a starter and carb kit. by just knowing the serial number. Also is the starter hard to replace.?
www.marineengine.com/parts/mercury_marine_parts/sn/a147683
does the same apply for tge 01 2 stroke 25hp. it seems tedious just for an impeller
I'm not sure. Some have a tab thing in the same spot that you pull up and slide out sideways instead of having that screw to disconnect the shift link rod. Some have some nuts on the backside of the mid section on the shift link rod itself that you have to undo then you can drop the lower unit. What's the serial number for your motor and I'll let you know for sure. 2 or 4 stroke?
Nevermind the last question. lol
thats, is fine, buuut i need to know,how to take that seal out i disconnected the bottom part, now , how to take the , other out, of the lower unit this is a 78-79 7.5 mucrury, , from what i see, i got to pull that . piece out,
The smoking kills me! Hahahahah
Looks easy when you already had every thing unbolted!
Still easy if you don't. 😅
Thanks!!
Thank you.
Richard J jaramillo
No problem! :)
it comes out above where the tub goes in bottom of motor
Ronnie Knight that's the exhaust. some will come out through there also.
Ronnie Knight can you send me a pic?
I can blow air in tub and no air come out of the bottom
Ronnie Knight check the thermostat and go from there. if air still isn't coming out of the bottom, the water passageways in your head might me clogged. I'd take off the lower unit and blow compressed air through the water tube that attaches to the water pump housing with the thermostat housing off too. if still no air coming through, gotta remove the head.
blow smoke in tube at thermostat hose and smoke comes out above the tube goes in the bottom of motor
Ronnie Knight I think you have to take off the head and exhaust baffle plate. you most likely have clogged water passageways.
U d only one to show disconnect shift rod of this type.
It should be the same. This motor is a 1986.
Well I followed your instructions and remove the foot it is definitely the impeller my serial numbers are zero 0B186027
Deven Morgan, Mercury Quicksilver impeller p/n 47-85089, Sierra impeller p/n 18-3057.
Thanks
Deven Morgan anytime
Ordered my part . but the funny thing is the Key was not in place when Iopened it up. It was just laying there and the impeller was wallowed out in the center ... once again thank you .
Deven Morgan that's weird. no problem, anytime. :)
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dump the cigarette...
I'm at 6wks with no 🚬 rite now. Best thing I've done.
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email your email i can send you apicture of what i really need to get done
The next time that I do that on a motor, I'll make a video of it.
Is it the same process on something like a 6hp Merc pull start? look for the shift link key? Thanks in advance.
Larkin Young what's the ser #? message me on my FB page Outboard Madness
How do you remove a lower unit from Honda 7.5 hp the old blue and white ones?
I'll make a video next time I do it and post it on here. I have one in my garage.