Testing an outboard water pump
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- In this video I quickly go through how to testing the water pump in an outboard motor. The main tips are having the outboard deep enough in the water and making sure you are turning the drive shaft in the right direction for your outboard motor (most often clockwise)
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Very handy tip. Thanks Stu.
Happy to help
Every time I work on my boats I end up watching hours of Dangar Marine. Thanks so much you have helped me keep my family having fun and fishing year after year. Thanks again Sir.
hola muy buenas tardes , quería pedirle un gran favor si es posible soy de argentina y me gustan sus vídeos y la verdad aprendo muchisimo , podrian salir subtitulado en Español para poder leer lo que enseña ,para mi y otras personas mas ,sería de gran valor muchisimas gracias y saludos desde Argentina
Me too 💯
Hello, I have changed the impeller on my Mercury 30hp and I have checked that the impeller is stuck and spins when you turn the shaft. but there will be no cooler water from Tell-tale. does pressure have to build up and can it take a long time? thanks in advance.
Farking brilliant. Thank you.
I have a ? If you dont have something big enough to hold the lower end unit can you use boat motor ear muffs to test the pump.
You can use muffs, but sometimes they don't feed the pump properly so don't consider no tell tale as proof the pump is bad.
good video man. i think i will try a deeper bucket. i get water out of the tell-tale if i hook-up the garden hose but no water in the small bucket i was using. so if i don't get water out of the tell-tale with a deeper bucke. its probably my impeller not pulling suction. because the garden hose is providing the pressure ? does that sound correct to you?
Yep, your understand is correct.
thanks for all of your good info man. it worked perfectly!
i couldnt get the 13mm drill chuck to fit over my Honda BF50A shaft, so can't figure out how to make it spin to test my impeller..
Great Videos! I have a 150 Etec that does not like to pump water when using muffs but is quite happy in open water. any idea why ? Maybe an etec thing?
Yes, some outboards don't work well on muffs. You can try holding them hard against the outboard until the pump is primed.
Thanks mate ! strange isnt it you would think the pressure would help it prime ?
Hey man! I have broken down my tohatsu 40hp 2 stroke motor and my impeller for the water pump is actually loose on the drive shaft. Is that a issue?
Yes, it shouldn't be lose. I would replace the impeller for sure.
Dangar Marine thank you. Also I'm a little confused on the wiring for the motor. I have 2 start relays and I also have some wires coming from my tilt. Not sure how to wire it together
Man you really know your stuff! I tried that same test and it was only pumping on high rev!!!! and was only pumping sometimes . So thanks for the info!!!!!! Will do a total overhaul!
You just saved my 4th of july man! cleared the tell tail still wouldn't pee, lifted my bin up a little higher and she started peeing again.... i was 5 mins away from taking the lower off, hopped on TH-cam for a guide on how to do it and seen your video in the recommended, thank the lord i watched your video first! Thanks a million man!!!
Saaaaaame
You are the man!!!! I was about to give up. I didn’t know it would suck air if the water wasn’t high enough. The muffs did nothing for me. Filled a tote and now she pumping water like a champ. Thank you!!!!
Exact question I had. Thank you
Doing this tomorrow 🤪
Holy shit. I destroyed my newly rebuilt pump running it in a tub without enough water. Now I know. Thank you!!!!!!
Yes hehe this is not easy.I tryed and get the shop mounting a new impeller when separated it,s gearhouse, but it dont cool good.A little used yamaha 8 so go for a new tohatsu next year.Tohatsu seems to have little to no problems with this since used them for years before.The yamha will be sold cheap to get rid of it.
Did this test on a Suzuki DF4 WP which revealed I had a leaking drive shaft seal on the top of the housing - half water coming out the WP discharge, the other half out the leaking shaft seal, result - insufficient pump head pressure to reach the tell tale let alone the cylinder head. I would suggest fitting a tube to the outlet with sufficient height to demonstrate the pump head pressure. As presented the test only demonstrates the pump impeller is rotating and won’t demonstrate pump head. Hope this helps.
Yo tengo problemas con un 5 hp mercuri no tiene presión el agua en mínima velocidad no tira agua
I've repaired many many motors here in Alaska and didnt know they couldn't self prime, you make great videos and they're Always very informative.
Thanks Charles, glad you've been enjoying the vids!
Straight to the point. This guy is great. Thanks for the terrific learning experience.
I wonder how it ever worked in the tank before we have used or for that matter in the seal? I could not make the pump work using the drill until the water was right below the pump as you explain. But normally we have had it in a tank with much lower level. So my question is how does it work when its in the sea and ihe water level is not that high?
Man, I wish u are my mechanic. Mechanics around me are stupid as donkeys!
That's a shame, you really do need someone you can count on when you take your boat to them.
Hey cobber. Brand new housing, impeller and still not pumping is it I've put something together wrong although I've done it twice going off a few different videos..
I guess I'm really asking is there anything under the pump housing that could be blocking access to the pump. Everything else works and runs perfectly. 1980-90's Yamaha 8hp 2st
Love ya videos so far this old outboard has been a pain in the arse and I can't afford a real mechanic.
Your carby video is what really got it going when no one could. It has been parked up in a shed for about 7 years and never used so I figured there'd be some gremlins.
Thanks again cobber priceless information.
Saved me from tearing it apart. I dunked it in a deeper bucket and it pumps like Trump.
haha, pumps like trump , love it
Stu
Thanks so much for your videos and knowledge this connected some dots for me
Man, Thanks so much! I just did my first water pump on a little Johnson 15 and set the engine in a bucket of water and it did not pump. Was getting ready to tear the thing apart again thinking I had done something wrong. Your video was a life saver. As you pointed out, these pumps are not self priming. I found a deeper bucket and filled to the level that you recommended and presto, she was peeing like crazy. Thanks for the excellent video. Keep up the good work!
Great. What about if its not pumping when hooked up with a water hose vs bucket?
Stu you are the man. This is the first and only time I have seen or heard this golden nugget of information. If this works I will dance a jig.
Good luck!
My son and I had taken ours apart and worked on the impeller. Once we were done we reassembled everything and... no water flow. We had the lower unit in a tub of water with enough to allow the intakes to be below the surface but your tip about lowering it even more was the key point to prime the pump. We tried again with a taller water tub and voila... problem solved...! Thanks so much for posting this video. It saved us so much time and money. Cheers..!
on a 85hp force you don;t have a tell tell well ya you do the two exhaust ports on the back. if using ear muffs under p s i should water be coming out the uper exhaust ports
You got it.
How would you do that if your shaft is larger than your drill chuck? Or any drill chuck for that matter
I would put a spline socket on the shaft, an extension into the socket then the extension into the drill.
After battling a water pump for a couple hours I watched this and just hooked up a hose with earmuffs. Problem solved, boat runs like a champ. Thanks Stu!! Rebuilt my lower unit with new dog clutch and all new seals, carb rebuild, fuel pump rebuild, fixed throttle advance, and everything is greased up. Literally all from your videos. Two years ago I paid a guy $650 to replace my impeller (after 6 weeks with my boat). The freedom you've given me is unbelievably valuable.
Glad it helped. :)
$650?? You got ripped.
@@wolfpackflt670 just like al the boat mechanics and shops are, rip offs, like car mechanics, a/c guys etc.. I can do them all and I know they are..
Nunber plis
Great tip.
Also, if you have checked everything out and everything appears to look good and the water level is high enough and it's STILL not pumping, look closely at the seal on top of the impellor housing. If it has a seal. Some housings don't have seals. Some do. If they don't, look at the housing itself. Make sure its not distorted from heat. If you stick a short hose into the housing where the water shoots out of the housing, there should be a good stream of water coming out of the hose. Just keep your face away from the sudden gush of water.
What happens when the water pump area plastic guess warm? Is this normal. It's pumping really good. Sometimes when the water comes out of the peephole it's warm. I don't even have 100 hours on my Mercury 60 horsepower outboard
If it's pumping water okay I'd say it is normal. There is plenty of friction in those impellers that is normally just cooled by the water it is pumping. They can melt if they run dry. The engine will warm up the water coming out of the tell tale.
@@DangarMarine thank you very much for answering my question. The boat is brand new, I probably don't even have 40 hours on the motor. But I do know it is pumping really good. Thank you once again
Changed the water pump and gaskets, raised the water level in the 'bucket' to just about where the water pump is situated and poured in 5-1 ratio of plain white vinegar which was cheaper at the supermarket, cancelled the descaling fluid......Ran for about 1/2 an hour and was left with a tablespoon full of sand, shells and silt in the bottom. Rinsed with fresh water and the tell tale and exhaust were pumping water out. Job well done
Nice one, sounds like it made a big difference.
so cool as you are a normal person , not like a lot of bit of knowledge self acclimated experts
Thanks you so much, your video has saved me. I just could not understand why my new impeller was not pumping. The ear muffs are useless and then used a large bucket. But as you have shown water level is critical. All good now. Thanks again.
You're welcome Steve, yes, I have very mixed results when trying to get a telltale on ear muffs.
Hey brother, I'm from Brazil and I'm serving the Brazilian Navy and your videos are helping me so mutch to fix de boats of my ship. Really thanks!
You're welcome Yago. :)
You may have just made me 500 dollars. Been unclogging stuff and tinkering half the day thinking I gotta take apart a bunch of things. Never had problems with my motor spitting water out...on the lake.
Muffs on...nothing. used muffs because I have a flat and can't take it to the lake! Bucket time! Can't wait for morning to try it out.
Also, my go to channel now and will inform anyone needing help! Thank you!
On the basis of this video I was very careful to test my Honda BF45 (which runs anti-clockwise) with the drill running in that direction. No joy. Took pump apart (new kit had been installed) and checked but still no joy. Then I checked the parts catalogue online and saw the crankshaft terminates in a 'primary drive gear' while the sump contains the bearing and short shaft assembly for a 'primary driven gear'. So motor runs against the clock but drive shaft doesn't. Tricky.
Ah, very interesting (and tricky as you say), I've got a dead Honda BF40 in the shop at the moment. I'll have to pull the crank case apart and look into this. Thanks for mentioning it!
Sadly, I did not see this until after I dropped the lower unit and took apart the impeller housing. I reassembled all and raised the water level in my tank to the prescribed height in your video and Eureka! A lesson I'll not forget. Much thanks!
You're welcome Chris, you know now! :)
best ever videos on youtube thanks
Thanks mate, glad you like them. :)
Hey just wanted to say thanks for your efforts and time. I'm an apprentice boat tech and I'm just finishing up Yamaha school in the states. Your videos are very helpful .. thank you sir.
Michael.
You're welcome Michael, good luck with last of your training. :)
South African for the win!!!! This is so smart. Really top notch video. thank you
You just saved me a lot of time and money. I replaced the water pump and couldn't get it to pump water. Filled up the trash can with a little more water and it pisses out water like a racehorse. Thank you very much.
You're welcome, happy to help. :)
@DangarMarineподскажите пожалуйста заменил помпу в сборе на Ямаха 8 а вода не идёт,опускал глубоко в бочку,а воды всё нет
my drill wont fit over the shaft 😑
You might be able to find a splined sock that will go on the drive shaft that you can then turn with a socket extension in your drill.
Damn! Thank you! I was Fed up with taking this leg off wondering what the heck I had done wrong on the impeller change
OMG! THIS is the video that everybody is looking for. I took careful attention to Change my impeller properly and then did the test in the driveway with the Ear Muffs, then the flush line with my garden hose (tell tale worked perfect with this flushing test) etc. EVERYTHING and I mean EVERYTHING was perfect though I could not get water to come out of the Tell tale. I even filled my trash can up to just above the Intake Grids and STILL couldn’t get water to pump through the tell tale. I watched this video and thought “...there’s no way this is going to work..” and yet when I backed the boat down the landing ramp and lower the unit into deeper water, I started the motor in deeper water and WHAM! ....Water streaming like a river!!!! YES! I still don’t understand the physics of this as to why the deeper water makes/made a difference BUT IT WORKED and Dangar I am forever grateful! Thank You!
You're welcome Mike, glad the vid helped you. :) It works because the pump is higher than those grills and can't suck air to get to the water.
@@DangarMarine Hey. I am from Russia, I use a translator. Sorry for my English. The question is, when we go on a glider, the water level is lower and the water flows. Why?
@DangarMarineа как же вода потом не уходит из помпы? как потом её снова засасывает насосом?вода же не остаётся там,да и это чревато если зимой замёрзнет
@ermak-rybakон не хочет наверное отвечать
I have a 90 hp 2 stroke outboard. Water is coming out the tail tell But it goes into limp mode when I run over 4500 rpm. Works fine below 4500. I’ve replaced the water pump, the thermostat, and the poppet. Could it be a false alarm from a faulty temperature sending unit?
Just tried this on my mariner and it’s pumping water but non is going out the tell tale. Used air compressor to see if the any tube is block but it’s fine. Any I ldea on what it could be?
I like your videos thanks for making them great job
Thanks Brian, glad you enjoy them. :)
Glad I found this video. You just saved me a few hundred bucks by not having to get my pump replaced. I had been testing my motor in tank but the tank wasn’t deep enough. Got a taller one and pump works great.
Great to hear!
wow..I'll try that tomorrow
Really enjoyed your videos,very helpful thanks.i have an 86 mercury 150 xr2.When I run in a tub ,I have oil in the water, any thoughts?
Can be either leaking gearbox oil seals or unburnt fuel due to running too rich or a plug not firing.
Thanks,it was a black color.A friend suggested since I had just replaced the impeller it mat be carbon residue being flushed out.
Is that possible?
Question
I rebuilt my pump and used earmuffs for my water supply (test). NO telltale.... any idea why ?
It's a 1985 Mercury 25bp
I learn so much from your tutorials boss ;-) Love it.
Greeatings from Norway.
Thanks mate! :)
I have a 9.9hp Yamaha that’s not pumping new impeller and blew air through the cooling system and it’s free totally stumped
I am in the middle of servicing my Mariner 3.3 HP 2 stroke. I came back inside for information about the water tube connecting the water pump to the power head. I came across your video and paused it after I saw what you did to check the pump using a cordless drill. Brilliant idea Thanks. I did the test like you did and it is ok, my question is: WHERE is the water tube? I did not find any in mine and when I thought to measure and make one, there is no port or anything to connect the tube to. do these outboard have water tube or this is how they are designed with out a water tube. any feed back would be appreciated. and Thanks for the video
Hello, I have changed the impeller on my Mercury 30hp and I have checked that the impeller is stuck and spins when you turn the shaft. but there will be no cooler water from Tell-tale. does pressure have to build up and can it take a long time? thanks in advance.
Stu is spot on; recently experienced this after I build a motor stand and tested the water pump after replacement (previously would do it from the stern of the boat). Used the same bucket which was not high enough with the stand like it was with the boat.
Hello love your videos by the way,I have a question,isn’t the water supposed to be coming out the grommet more than that,like shooting up more,that is how my 1982 7.5hp Johnson water comes out and my motor gets hot,thermostat works like it should,and all water passages are clear,thanks.
I have 30hp 4 stroke Mercury. Put new water pump in and took lake. Still want pee. Checked all lines for blockage a all looks okay. Intake clear to. Any suggestions.
Hmmm... You look sober in this one? Haha
I can't apologise enough. I feel I've really let the team down. ;)
Many thanks for this. I'm having issues with my yamaha 8hp 2 stroke. I've replaced the impeller and done this test andvall good. I took off the side and back plates and cleaned out a lot of salt build up and replaced the thermostat which was fully salted up etc. Turned the motor on its head and ran water down the intake tube and got good flow through the motor and out the telltale. Put it back together and no water coming through. Almost like there's not enough pressure to push it up the intake tube. I've ordered a new water pump kit, is there any other reason this could happen. Many thanks.
You saved me a bunch of time also/// I was getting ready to change out my water pump and tried what you showed...it worked just fine with a little more water...thanks so much... : )
Glad it was that simple. :)
@@DangarMarine my only comlaint is using a ratchet strap to pull the leg on my 90 tohatsu loccks up with about 2inches left no way am i goingbto force it i think its the shitty copper water tube not seating in the pump pity you CAN'T look inside and see
Wow great info. I just assumed if the water was above the intake it was good to test. I just got lucky adding extra water into the barrel thinking it would help. Feel like a pinhead with a Phd once again!! Got my Johnson 78 15hp back in the water thanks to your advice/video on pumps, impellers and lower unit seals. Wish I could buy you a brew or two brother. I kind of feel like I stole something without paying you... :-(
All good Edwardo, think if it as a Christmas present. Happy New Year! :)
Dangar Marine thank you my friend and Happy New Year to you.
I have a 61 Evinrude 5.5 HP that is not pumping water. I replaced the impeller and tested it using your manual test. It's still not pumping water. The old impeller looked OK to me but I replaced it anyhow. Is it possible the impeller was installed backwards? I assembled it the same as the previous one.
Great info, mine does not self prime and I could not figure out why I was burning up impellers. Thanks for great info.
I have a yamaha f15 2012 and it is overheating only at idle. It pees fine with new impeller new thermostat and anodes. What might be wrong???
I changed my Water pump yesterday Water pump yesterday Along with the lower unitThe rabbit is don't give it enough water to spit out the p*** holeAny ideas
Stu, once again your videos are a life saver. Planning to take the wife out on the lake tomorrow and when I was prepping the boat earlier in the week, it wasn't pumping water. Thankfully I knew what not to do and it didn't overheat but I remembered this video and tried getting a bigger tub. Bam. Pumping just fine. Also a nice side effect of the engine getting a little warm was my moisture misfire gremlin was cooked out of the ignition system. :P
Hey Peter, sounds like you've had a big win there. Hope you both had a wonderful day on the water. :)
We did indeed. Had a little issue with the gear selector not wanting to go in to reverse. Looks like its a cable issue and not the motor itself.
Was definitely the cable. had to adjust the "nut" on the engine side of the gear selector cable so that at "full throw" reverse, it wasn't pushing the rod far enough back. Takes me back to my amateur bike mechanic days. :P
Me and my motor . Was pumping perfect then stoped. Tried again quick and starting pumping again and now nothing. ?
Stu please help , every time I put in a new impeller it does not pump very well and I end up putting the old one back in, it’s a genuine Suzuki part on my 90hp Iv tried in a water drum and muffs and results are the same .
you're awesome
I have a Honda BF15AX and when doing this test, water comes up the drive shaft also. Is this normal? I couldn't find a seal for here in the parts list
I inspected the pump and housing on my dt 15 suzuki and it looks fine so I Replaced the grommet around the drive shaft and it is not pumping water very high .I also see there is a fair bit of water coming out between the shaft and the grommet I replaced(the ne on top of the housing)I am temped to replace the impeller and the plate and gasket to be see if it will pump more water .I do not think there should be water coming out around the lip of the grommet and the shaft but i cannot remember if it did this on my other outboard.
The pump looks like it has OK pressure but it will not go up around the engine and out the pee hole.
Any suggestions
It takes a while for my merc 125 to pump when I’ve got the muffs on it even with hose spigot wide open.
Great video!
Would you say that water coming out from the pump housing through the drive shaft hole when testing with a cordless drill is normal?
I replaced my water pump kit on my 1996 mercury 40 hp two stroke motor. I put on the earmuffs turned on the water and started the motor I still get no water coming out of the pea hole?
I'm going to try that trick tomorrow, I took it apart and everything looks ok with the impeller, my impeller only has 3 blades, factory made that way? Also, when you put the lower unit back together with the upper does the pipe that goes into where the water comes out of the impeller housing have to be tight, mine is sloppy but looks like that is the way it is designed?
What could the problem be if the pump is pumping water but when you reassemble the lower unit, it won't pump water up to the motor? I used the drill technique like you did here and it works fine, but it won't pump the water up into the motor when running.
Thank You I rebuilt my water pump reinstalled my Foot (Lower Unit) No water with muffs.Placed it in a barrel up to the water intake’s and no water. Removed the lower unit 3 more times to re check my work. Scratched my head,slept on it and tried again the next morning NADA! Searching the IT and found your posting. Repositioning the engine in order to get deeper in the barrel and WooHoo, my work is good and proves a point to me that muffs can’t be trusted nor can a barrel if you are not close to the cavation plate. Thanks again and as you said if it were a self priming pump things could have worked but now I know. Stay Safe and Enjoy the Water ✌️
Thanks for that info. I was just looking at a 6HP Yamaha tonight with muffs and it wasn't pumping water - never thought a minute that it could be a priming issue. Still buying it, because it's a fairly easy fix either way, but I'll have to barrel test it when I get it home now.
@ChrisPollardвы смогли решить проблему?вы меняли крыльчатку? пошла вода из контрольного отверстия?
My old 1997 johnson 50hp seems to have issue with water flow. Took the lower unit down, run a garden hose to the water pump inlet port, it takes over 20 seconds for the water to come out the pee hole. Is it supposed to be that long? I might have a leak somewhere in the system or is it clogged up?
My Yamaha 15hp squirts water when it's is in forward or reverse. Doesn't that mean direction of rotation does not matter? Additionally new impellers don't have a pitch correct? So that further seems to indicate it does not matter. Maybe I am wrong.
I think im missing something , my pump seems to work but have an issue when it was all back together and all tubes are clear im sure it was winterized before i bouggt it,does the whole leg fill up with water before the tell tail starts or ? Its 7.5 merc
Always make things simplistic, love all the videos and tutorials! Thanks again....
Thanks Chuck, glad you've been enjoying the vids. :)
Suzuki 70hp 4 stroke what is best way to determine direction pump turns?
After testing my motor after a 6 month break it wasn’t pumping water, pulled the pump apart and rebuilt it only to find it still didn’t pump… after a second rebuild and a lot of cranky words I found your video! Adding more water to the bucket magically fixed it, thanks!
Thanks. I was thinking it would have more flow than that. I'm still having issues getting water to pee hole.
If the impeller sits on the shaft upside down, in the wrong position will it effect the flow of water of the water pump. If the water pump still not pumping up water what can be issue?
Great video thank you
You're welcome Lee.
How do I know which way the drive shaft is supposed to spin, sorry I’m new to this.
Another great tip thanks
No problem 👍
Thank you,I think that is what is going on with mine,replaced all the pump parts including a new outlet seal and little or no water pumping,it was about the level of your first test and no luck with the muffs either,I need a trash can or something deep to get this thing primed.Going to try spinning it while disassembled too to know it's pumping.
Hey Stu, disregard my previous comment, I took it apart and noticed I put the oring on the wrong groove. I had a 50/50 chance of picking the right one and..........
Glad you got it sorted mate, sorry for the slow reply.
Thanks for showing us how to solve the mystery of why our newly installed water pump was not working! Not having the water level high enough when testing prevented the stream from flowing. It would have been better if we had found your video before our fourth breakdown and re-assembly, but my 16 year old is now an expert on both impellers and thermostats.
Hey Grace. Oh well, at least it was a learning experience. You never know something until you've done it four times! :)
My motor used to work with ear muffs... then one day I was showing my boat to sell it (with the ear muffs) I noticed the stream getting weak and the next time I started the motor with the ear muffs again nothing was coming out so I checked the hose nothing in there so I suspected it was the water pump. Changed it and still not working with ear muffs. Going to try it in a deep reservoir of some sort.. I’m just wondering if it worked with ear muffs before why wouldn’t it work now?? I’ve never liked using the ear muffs tho because I didn’t think it was the best method but never had a reservoir big enough.
75 hp Mercury 2 stroke
Year 2000
Use engine muff ear muff are made to keep your ears warm lol
Great video very very help full
just wondering what you do if you get some of the impeller up the pipe will it work itself out ?
The Governor has given over to sin, I think he believes what he is doing is actually righteous
ooh i think you have solved my issue with my 2008 suzuki DT30. Thank you keep up the great work!
Great to hear!
Thanks madd max of boating, too my pump apart three times as i have no tell tale hole watwr gojng to try in the lake
if you have twin outboards counter rotating, both engines will run clockwise right? so the counter rotation is done in the gear case correct?
I put muffs on mine and won't pee could this be the issue, was thinking about putting it in the lake and see if that helps
Does this apply when you using muffs . Will it self prime if using them ??
Awesome, thnk you.
You're welcome!
Tried everything.....blown out the tubes and chambers, ordered descaling fluid, ordered new pump and gasket etc etc then you tell me this......sometimes we cant see the bleeding obvious. Going to do it when everything new is put back together. Honestly, I despair at the simplicity sometimes
On the bright side it will all be 100% when you put it back together. :)