2 stroke mercury 25hp installing a new outboard water pump, impeller and coldstart

[@michaelfaulkner386]

Just bought a 25 and changing the impeller is my first job. Thanks for the video!

[@sparlin88]

I want to thank you for helping me solve a problem. I just bought my first outboard . A 1999 25hp mercury . Bought from a guy about 100 miles away . Went there and it fired right up and ran smooth . Paid him $1,200 and took it home . Put it on this boat I just bought also and started it up with no problems . Went to put it in gear and didn't go in forward or reverse. I called the guy complaining and was told its my problem basically. So got here on youtube and found your post on changing water pump so went out and found out his great mechanic he bragged about didn't put the locking pin back on the gear selector shaft . Its fixed now and my wife is son happy . We both believed we were ripped off by a guy with no conscience or heart . Just greed. Thanks so VERY MUCH !!!!! YOU ROCK !!!

[@petergoldwing3698]

Thank you young man. Prior to looking at your video I watched another. He doesn't talk about removing that gear link from the motor. I wasted time trying to figure it out.I couldn't. Your video is clear and precise. Much apreciated

[@partsbenttoys]

6 yr old vid, still useful and helping ppl get by. thank you, great video btw

[@aaronm1375]

Thank you, excellent video. My nephews dry started my Mercury 25 when I wasn't around, and it was recommended I replace the impeller before taking it out on the water again. I was dreading it, but after watching this video I am confident I can handle it. And I was gracious to my nephews since they didn't know how bad dry starting is, but they do have strict instructions on what will happen if they ever dry start it again. Thank goodness one of them tattled to me, or I might have never known.

[@upnort1842]

Thanks for the video! I like how you very clearly point out all the bolts and the retainer!

[@laloromero6860]

I paid someone like $200 because I thought it was going to be way to hard for to work on the lower unit. Your video makes it possible thanks!

[@t.d.mich.7064]

Thanks for the heads up about the shift linkage disconnect! I've done this job before on smaller Mercs without electric start, I would not have known to look for this before trying to drop the lower unit. Good info!

[@channel-gj8pl]

Thanks for the information on You Tube. I changed a water pump for a friend today and it went just as you showed. This improved my chance of having a successful repair. The engine was a 1991 Merc 25.

[@williammadden9558]

I cant say thank you enough! I have a 1989 MERCURY 25 HP outboard. One place wanted $350 and others didn't even return calls for this job. $46 for the kit on Amazon. Your video was excellent. You cover everything extremely well. Only difference on the 1989 engine is the carb cover and starter are on the port side of the engine. I only had 1 issue getting the o ring to stay on the housing cover. I had to stretch it a bit, which took some doing, so it didnt want to roll off. Once again, excellent video and a sincere thank you!

[@521VX05]

Excellent video. Was a great help in getting our 2000 25 EH changed out this week. Only difficulty we had was the shifter wanting to change gears as we fed it up the tube when reinstalling the lower. Just took some trial and error.

[@johnvyverberg3283]

Thanks for the tip on removing the clip for the shift linkage! I was puzzled by this until I saw the video. BTW, my engine is a 9.9 Belgian 2 stroke.

[@alexmillwood1433]

Thanks heaps mate I've just bought one of these after watching this I feel confident to do the job myself and learn a lot more about these great little motors cheers for saving me some cash to every little bit helps at the moment

[@bart2u]

I had no ideal where the release was for shifting linkage. Thankyou so much for making this vidio. The macanic wanted 1 and1/2 hour and up to $100 dollars for parts u saved me $400

[@darrylhenchie4765]

A brilliant tutorial. Thanks mate. Just purchased a dinghy with 99 Mercury 25 hp. You're video was a brilliant and timely find. I've subscribed😁

[@ericbrown9835]

Excellent video. I'm not at all hesitant to now take on my impeller change out.

[@fredrikh9299]

Thank you for generously sharing your know-how and taking the time to make a very instructive video! Regards from Sweden.

[@JBOutdoors]

Thanks for a great walk through video. I've done a smaller 7.5 hp mercury and wanted to compare as I'm doing one on a similar motor to yours.

[@TheRfleming]

You were very informative and you didn't talk to much.Thank you.

[@robertcook1065]

after watching your video a bunch of times I did replace water pump today and cured the problem. thanks

[@deanbowe4070]

Just used your video to change the impeller on my mariner motor, thanks!

[@kevinapel3027]

Best video for this subject I have seen. Thanks for helping me out! You missed your calling. You should make instructional videos for other things. Thanks again

[@ShnitzlHaus]

+Kevin Apel thanks Kevin :). I do what I can, but have to work a job that pays the bills to. Life :)

[@tomschwartz2811]

The water tube came out when I dropped the lower end. With it going so far up in the motor, it's not that easy to re-insert it. I took a 5/16" wooden dowel and put it into the lower tube end. It's a tight fit and makes it a lot easier to re-insert the tube. The straight end of the tube goes up.

[@classicbikerx3588]

Wow, so much harder than the bigger units due to shift linkage! Good vid

[@John-of5sh]

Excellent video-Definitely on my "To-Do" list. Thanks so much for sharing your time and expertise!

[@williamdabinett6222]

Thank you so much I’m so happy you done such a clear video Just wound Fil I’m from Australia thanks mate 🙏

[@tandk86]

Great work! Mine is flowing water like I never seen with pressure

[@cagleoutdoors6384]

This video saved me a ton of time thankyou your a life saver

[@russwentz3957]

Thank you, thank you, thank you! Between diagrams and service manual, wasn't clear on the shift linkage. Very clear, well done video. Thank you for your time to pass it on.

[@captlarry-3525]

thanks ! my 20's are older with a screw holding the shift rod,, but I am sure the hints still apply, I am now a whole LOT more likely to do this important maint job !

[@freddynews6478]

Excellent video and description narrative.

[@thomasbrock4705]

Thanks man,you saved me a mechanics bill.

[@LeslieWorks]

A bolt just snapped off inside when trying to take the bottom off....now what?

[@LeslieWorks]

Got the other 3 off and it dropped, but the washer didn't come out 😂

[@DougLandry-ub4dg]

Thank you just did mine . Your video was a great help.

[@jackgunter3999]

Your video just saved my day!!! Thank you

[@mbeck3132]

Very well done I wonder if it’s the same for a 2002 model?

[@JesusLove723]

I have a 2000 25hp mercury... This vid was a great help. Thx!!

[@stevejones6111]

Great Video. I would suggest putting a little light grease around the vanes on the wear plate and the top of the impeller housing so you have lubrication on first start up before the water reaches the impeller.

[@ShnitzlHaus]

Agree. I believe I used petroleum jelly in the video. Anything works.

[@dylandavis4074]

@@ShnitzlHaus isn't petroleum jelly, or any petroleum based grease not good to use on rubber parts? Causes them to swell? This is what I've learned with brake parts on vehicles? I use Syl-Glide for rubber brake parts. I've seen petroleum based grease degrade caliper slid pin boots and caliper seal. Great video though, I'm about to do this with an outboard I just bought.

[@ShnitzlHaus]

Yes you are correct but realistically it’s going to get washed out fast and argumentative points would be the impeller is a wear item and needs to be replaced regardless. Also most of these impellers are likely seeing many dry starts from sitting in storage to pulling the boat out of water for lengths of time.

[@goneFishing-yx5zy]

I just did one today and notice water coming out of where the shift rod comes through the that gap right about the lower unit dose yours do the same

[@RuXsel]

U remove those 4 big screws like it was nothing.. i have to turn into hulk just to turn those screws 🤣

[@oilheating214]

Wow you make it look easy

[@chuckburgess6592]

looks like my job next. thanks for the information.

[@BladeRunner.43]

I thought I had the wrong impeller I'm like well that doesn't fit lol thanks for the vid

[@viviendolavidafeliz]

Thanks for your video, I'm trying to get the extractor key for the tail of that same engine and I can't find it anywhere and many mechanics don't even have that key. Can you help me know where I can get that key?

[@georges947]

Thanks for the reply I'm thinking is good looks the same at the end of video it's been sitting since 2005 just picked it up and going though it. Thanks.

[@enercaledonie8496]

Merci pour le partage de nouvelle caledonie 😉👍

[@jimfry5385]

nice video. one question. I saw that you didn't use the 4-bushings. how come? Thanks Jim

[@MrAndreisousa]

hi thanks so much for this video, if I do everything correctly and still no water coming out in that same spot, that means there is a blockage somewhere, any ideas how to fixed it? thanks in advance

[@RobertSigler-t8r]

Hey dude loved the video great help I’m not much of a mechanic. But I do have a problem hopefully you can get back to me. Put everything back I believe correctly except I do not have forward on my motor what did I do wrong?

[@michaelwalker7961]

simple, easy explanation, appreciate it, I have a 25hp 2stroke 1988...thanks eh! ;-)

[@huntmasterjames]

Do those reed valves got bad. I been having trouble keeping my 25 hp mercury running. Carb rebuilt. Replaced vacuum lines.. getting gas out of vacuum lines when suction applied. Any suggestions.

[@Dave-jc6ky]

My motor is a 1987 Mercury 2 stroke and requires an o-ring seal near the end of the driveshaft. It wasn't on mine and I'm wondering if it came off during removal of lower unit and remains inside of the driveshaft housing. Do you happen to know how to remove the driveshaft housing so I can check for the o-ring?

[@ct1762]

that shift rod clip is a bit easier than my 82' 18 merc.. ingenious design. you do want to slap some 2 stroke oil inside the pump housing and on the baseplate, however.

[@ajfarr3369]

Should the water tube on my 2003 mercury 25 HP have a snug seal at the top end ? There is a lot of space at the top around the tube .

[@jacksonjuergens597]

Thanks for the help good vid will subscribe

[@socalinhouse]

excellent video dude!

[@ShnitzlHaus]

Thanks!

[@shaneodom6574]

Just curious I lost the washer on the shift linkage. Should I go-to my dealer and try to figure out what size? Or can run with out it? Oh I have a 1988 25 horse mercury. Not even sure if it came with one

[@shanehester4852]

Do you know if these motors have a temperature alarm or not I have a 1998

[@suzanveltre7015]

I was forced to choke down a Harris ad to watch this video. Seriously dude?

[@ShnitzlHaus]

……… 🤷‍♂️ I don’t choose the ads displayed.

[@leonarddutra1739]

my mariner has a strong stream also down shaft to lower unit

[@Dave-jc6ky]

Hi, Thanks for the informative video! We have a 1987 Mercury 2 stroke XD ELH outboard. I will need to get this done. I already have the kit. However while apart I also have a complete seal kit and need to get that done and change the prop and prop shaft seals too. There is a single, "plastic" perhaps nylon nut for propeller and I need to find out if it needs replaced each time the prop is removed. Hopefully someone knows the answer to that and if anyone knows of a video on replacing all the seals in this lower unit PLEASE let me know. Thanks!

[@leemcguire7436]

What happens if when I pulled my lower end I didn't have a washer on the metal rod.like the one u said not to lose

[@ericremillard8335]

What is the point of the little washer on the shifter part? I changed mine but it didn't have 1. I bought it used tho so the owners before me might of lost it ?

[@gardeningGTA]

I have the same motor but with electric start. I can start the engine. But the engine bogs out and stalls after I press the accelerator. Any tips , ideas what the issue might be ?

[@Asys1985]

I changed impellar and mine is leaking water out from the area just above the water level. Alittle bit above the lower stream you have. Any idea what it can be? I get a stream up aswell and its alittle hot so you can atleast touch it without getting burned.

[@dylandavis4074]

Do these 25hp models have a thermostat or should they be pumping water immediately when running?

[@davidv7616]

Great detailed step by step thank you I just did mine today

[@gloomgloomy9147]

Look very easy now ! I have a question... I just bought a Mercury 25 hp 2 stroke and I can`t visualise how is attach the throttle barrel, the engine is a second hand, and I`m not sure it missing maybe a piece. Can you show me with a short video how this is attach ? I have the Quicksilver control. Thanks in adavance.

[@badluk1]

Great video!! Thank you!! (And still scared to try it lol)

[@MrGabys91]

My water tube stayed inside, it didn't come off. The water tube seal (the rubber piece you referred to) stayed attached to the housing though. I have a 94 merc 25 hp 2 stroke. I didnt hear anything crack, everything came out smooth. Is mine just like that?

[@josephberlin5987]

Great tutorial. Seems a lot fewer steps than for omc

[@larryhauck3285]

Fantastic video!

[@poopyhead20002]

Would you be able to tell me when the fuse is for the electric start?

[@finnanutyo1153]

Im sure itll be thw aame on my 2003 25hp mercury elh. Mine has been running rwally slow for thw past year or more. Pretty sure ita the carb. Im doing a aeafoam treatment, but the water pump crapped out after 1/4 of a gallon of treated fuel went through it. Good thing watee pump kits are cheap

[@Ethan-tz4kp]

Does anyone know about how long this would take for someone whose never done it before with decent mechanic skills? Thanks, the video is awesome and giving me the confidence to maybe try myself!

[@jeffreyotten7020]

2 hours from start to finish. Did it yesterday.

[@jameswhitman2240]

Thank you for the very helpful video. Can you offer some additional guidance and some trouble shooting. I replaced the impeller on my 4 stroke Mercury 30HP of similar vintage to the motor you work on during video and followed the steps carefully. After I got the engine put back together with the new impeller and restarted the engine, it doesn't make water fully. There is just a bit of water coming out of the outflow and it looks like water is being pushed up from the lower unit but outside of the lower housing. It appears as though only some of the water is making it to the upper section. Where would you start to diagnose where I may have made a mistake?Thanks

[@samlancaster6767]

What is the hole in the lower unit just above the water line that’s shooting out water? I just replaced my water pump and noticed mine was doing that.

[@Ripfishallday]

Well done!

[@RubiconUnlimited]

this install is Water Tight! great vid

[@RossWoodward-sg7ni]

Clear and concise thanks!

[@liamwells7990]

Does the pin pass thru the spline

[@michaelfelices4669]

Hola buenas tardes, quería saber que sale los cables del baston o acelerador de ese mismo motor mercury 25 hp. Tengo el mismo motor pero no logro conseguirlos

[@tbtactical]

I have gas dripping down from between the prop and skeg. Any idea what's going on? Boat will turn over but won't continue running. Also, great video! Thank you!

[@ShnitzlHaus]

Exhaust runs past the inner prop. Normal. If allot of raw fuel it’s rich. If just oil normal. Hard to tell without seeing.

[@markbaldwin975]

Great video...very thorough and detailed.

[@ShnitzlHaus]

+Mark Baldwin :).

[@smallflipz2302]

I need help i cant get the shifter rod and the clip to line up!! Everything was put back the same

[@MichaelPop72]

Hello, is the process the same on a 2006 four stroke with same hp?

[@TheRfleming]

Mine is a 72 20hp is there a lot of defferents?

[@Dave-jc6ky]

HI, Our 25 hp 2 stroke is a 1987. It look similar in design though the part to disconnect shift shaft is a bit different. I understand on mine there is supposed to a washer on the shift shaft to you have to be careful not to lose when dropping the lower unit. Is there something that insures on yours the washer doesn't fall off inside the motor when you drop the lower unit?

[@connorjacob4339]

I think I lost mine and I haven't put it back together yet do you know what it's for

[@samuellorette5708]

Thanks a lot! Will be very usefull

[@ericpigg2689]

Mercury's mess with my head with that weak stream when the engine is cold! First time I changed my impeller, I thought I did something wrong.

[@TheBagman1977]

Same

[@kylemanson3015]

Mine does this too. It has a small amount of water coming from the tell tale when it cold. The tell tale gets stronger as it warms up. Is this normal for these outboards?

[@wmkess]

@@kylemanson3015 It must be tapped into the actual cooling passages, so it is dependent on the thermostat opening. Most outboards have it on the bypass line so it has good flow at any temp and only varies with engine rpms.

[@coleman1994able]

I have this exact motor and mine does the same thing! I thought I might need a new impeller until seeing these comments and this video.

[@cupslinga]

Was told to check the thermostat is moving freely as well, at the water pump change times as these are responsible for overheating the powerhead when they jam shut 👍

[@kenhart5259]

What's so important about the washer? Mine didn't have one

[@justinallison9757]

What size s wrench do you need

[@joeblowjohnny2297]

Everything is remove 4 bolt and shifting cable is remove but my 25 mercury foot still won't pull out . It's moving slightly but won't slide out . Even trying to slightly bang the foot with 2x4 . Slightly moving but won't pull out . What do I do ?

[@Streetfords93]

Hey just want to know what the linkage (The one that connects to the plastic piece on the side of the carby) you have taken off as Im missing it on mine and want to know what it does as mine works fine without that linkage? Thanks!

[@bryantoney3275]

Nice video!! Any idea what the other o-rings are for in the kit?

[@ksemi02]

Very informative, I’m doing mine now. But my kit came with two the paper gaskets, did yours? Thanks:)

[@rustybill8702]

This was the best instructional video I’ve ever watched. I wonder if you might tell me where you found the model # location? The serial # on my 25 hp 1994 mercury was easily found but not the model number.

[@30383]

If your motor only has a plate showing the serial number (older models), Mercury has a web site where you can put in the serial number and the year and model number will pop up! It was the only way I knew how to order the correct impeller. Great video, by thye way

[@thomasblais7751]

Hey man do u bolt on the motor to your transom?

[@jonathanb9429]

Excellent video ! Thanks

[@mdineen]

How much torque on the bolts for the lower?

[@dhajek2754]

40#