HOW-TO Impeller (water pump) Replacement In Mercury Outboard Motor

HOW-TO Impeller (water pump) Replacement In Mercury Outboard Motor
If your outboard motor isn't cooling itself then you must watch this video!
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[@DrZippo01]

Great video. Very clear and concise. Thanks!

[@danabeachy2631]

The best impeller replacement video on tube tube hands down. You cover everything start to finish in a timely matter. Good job Thank you

[@WindrifterMr]

I am a retired mechanic myself and I really like the fact that you do such a great job, (as far as good camera angles, great explanations, and details) which are lacking in many other videos. Keep up the good work.

[@SgtDodd]

Thank you young man. My 1973, 7.5 stopped spitting water. At 67 I'd usually pay someone for that. The hardest part was fitting the lower unit back on. Found that standing motor on the cover worked.

[@davidpatterson5728]

Of all the videos I watched, there was none that mentioned the copper tube. Yours my friend saved my butt! I removed mine and there was a piece of the old impeller lodged in he impeller end. Had I not seen your video I would have NEVER looked at that tube. THANK YOU!! Your videos are head and shoulders above others. I am wondering however, should there be a sealant between the lower and upper half when putting it back together? When removing the two halfs there was a clear silicone substance I had to scrape off. I did put a small bead between the two when reinstalled. Thank you so very much

[@andrevanheerden4936]

Hey Don, great video it is but three steps l would recommend. One: grease the splines of the shafts with water proof grease and slightly lube the little o-ring on top of the driveshaft. Two: when installing the g/box rotate the fly wheel at top of engine very slightly clockwise or rock it back and forth to line up the splines. It will slide in easily.

[@alexfullmer4707]

And what is three?

[@wbgator1]

Nice job once again. Good old Mercury..... and looks like it hasn't seen any hard use. I did jobs on them like this. Where I live we call the impeller the water pump. Also, I use a little dish liquid to lubricate the parts when doing this job. It helps the pump get its initial few turns off to a nice slippery start and then the water just washes it away. We also called the fin above the prop the cavitation plate. Thanks, haven't done one of those in a long while, brought back old memories. Keep them coming

[@overcooked.chicken6977]

Thank you for the close camera angles. It’s greatly appreciated.

[@stewartbruce2409]

Dony, you truly are a master mechanic that has the ability to convey your knowledge to us students in the you tube classroom. Thank you for all the easy to follow and understand video productions. All the best and blessings from New Rochelle N.Y.

[@andymain8716]

Another great video, thanks Donyboy. My motor is almost identical to this, probably a bit older, and it would have be a real pain of a job to do without having watched this. The zip-tie trick didn't work for me so I cut a ring of 1 inch flex hose, bent the impeller inside of it and then mated it up to the housing so I could just push it down and this worked great.

[@awalt26439]

Another fine HOW TO video by the small engine wizard, thanks.

[@revdcdon970]

Great vid, as usual. I just helped do this to a larger Mercury (150hp)and they are very similar. A couple of things I found out. It's best to start by placing the gear shifter in gear (we used Forward). The reason for being in gear is the prop can be moved so that the splines at the top of the shaft can be aligned to slide the lower unit unto place. The nut that can not be taken off until the lower unit is broken loose is actually to help hold the lower unit from falling out and getting damaged, while starting or removing the other nut(s). On the larger engine there was a sleeve to align the water line and the shifter had to be coaxed into place as we tightened the unit holding nut in the front. Piece-A-cake it wasn't, but after we learned the method of this madness, it became more straight forward, and now that I may never need to do it again, I felt proud that I can. Hope this may help someone else to shorten their learning curve. Thanks for the Movie Don. blessings, rev don

[@donyboy73]

+donald ducky thanks for the tips

[@robertknowles2699]

Nice water sleeve to fit in pump and over the brass water pipe leading up. Wonder if those are a standard part or heat resistant plastic from a hardwear stow.

[@sgtcote1]

One of the best videos I've seen demonstrating how to replace the impeller. Thanks for including all the tips and tricks on what to look for while doing the job. Thank you...

[@jamesmullins3219]

one of your best videos. good photography, good editing, great explanation....thank you!

[@donyboy73]

+James Mullins have a good weekend James

[@michelespinasse1763]

It is the best tutorial I have seen about Impeller Replacement. Good quality of the video ,clear and thorough explanations. Thank you.

[@nathansimon-cn1yt]

I have watched your video & found it to be very simple & easy to understand, thankyou.When reassembly commenced I inadvertently had moved the gear selecter from neutral position,so now after some time I managed to bring the gearbox together but now reverse position is neutral, neutral is forward,& forward is reverse?any tips or thought's would be appreciated.😢

[@lindabushey3524]

Fantastic video! Really enjoyed it! It inspired me to work on my 1985 Mercury 9.8 . Things went very well except for I have no reverse and neutral is in the reverse position . How do I go about getting reverse, neutral and forward working? I read others had the same issue. I would appreciate it if you could add some guidance. Have a great day!

[@buff985]

You sir saved me a lot of time and money. Thank you so much. Tip for everyone watching. If it doesn't go into both gears obviously something moved in the process. Once you get the drive shaft back in put both nuts on finger tight and try and make sure it goes into all 3 spots (forward neutral and reverse). If it doesn't loosen the nuts and pull the shaft out just slightly so that the gears aren't changing and adjust the shifter. Before tightening the whole way down spin the prop and make sure the shifter is in neutral. That way you won't have to go through the whole process again. If it's wrong you'll start the motor in gear (don't ask me how I know...)

[@joshhartelt7022]

I too found that out but upon trying to remove the lower end again and it's stuck, opens up about 1/4" but that's it. Any ideas?

[@mattymiller3789]

thankyou so much for this very detailed and lucid video! Got a new boat with this motor and was trying to diagnose the problem of stating and stopping, finaly realised no water from hose as i am a land mechanic... ran half a dozen times for 5 minutes. going to see if any damage after changing the impeller! 10/10 video mate

[@frankthompson3495]

Great video. The reason you were struggling installing the lower unit was possibly because there was no grease on the shift shaft or drive shaft splines

[@tonym6920]

Hey Dony, great video! You know Dony, I don't own a boat, but I find videos like this fascinating in that I always learn something new or just to see how things work. They're great learning tools and afford the rest of us DIY'ers a chance to broaden our knowledge and gain confidence when we're confronted with a repair that, at first, seems way over our head. Thanks again!

[@skeeter50001]

Good set of instructions Dony. Lots of good knowledge. Thanks

[@3141592731415927]

Nice demonstration. I have a 1966 mercury 110 with water flow issues. I'm sure an impeller change is due. Your video is the best that I have seen. Thanks

[@paulwhite9848]

Old video came in handy thanks Donyboy

[@scotty2307]

Great video donnyboy. A couple of tips if I may. Start with the shift lever in forward gear. This will let you turn the prop to line up the drive shaft splines when you are re installing the gear case. And also, apply some grease to the drive shaft splines. This step can save you from absolute misery, next time you have to remove the gear case, especially if you run in salt water. It is certainly nice having the flat on the shift shaft. Some outboards do not have that. It is no fun to get the thing back together only to find that the shift lever wont move. LOL I don't know what it is about those older two cycle outboards, but if you take care of them, your grand kids will still be using them down the line.

[@fleetwin1]

Rotating the flywheel slightly while installing the gearcase helps to line up the driveshaft splines, and don't forget to lube those driveshaft splines before installation!

[@daleyurk4369]

Great video Don. I'm always glad to see these longer repairs and rebuilds. Keep up the great work.

[@donyboy73]

+Dale Yurk thanks

[@ianbutler1983]

Dony, thanks. I know nothing about outboard motors, but I still enjoyed the video.

[@aleblanc3547]

Eric the car guy uses that rubber grinder wheel also. It looks like it's perfect for removing old gasket material as well as the carbon you removed. Great video, Dony. Thanks for sharing and taking the mystery out of bad impeller pumps.

[@donyboy73]

+A LeBlanc have a good weekend

[@jetjazz05]

+A LeBlanc I've thought about buying one, but I think they're like 30 or 45 dollars a PIECE! That's pretty pricey, I'll probably just stick to brilo pads heh...

[@99carnot]

Excellent trouble shooting, and helpful installation instructions. This is good to know for any impeller pump application. Thanks and have a good weekend!

[@furyiiiplate]

My Merc 9.9hp 2 Stroke impeller only has about 10 hours on it, but I was just thinking my Mercury Classic 50 has a heck of a lot more hours on it and should be changed.... Then your video shows up and I think that is the Final Hint!! Now I remember how easy it is to do... Thanks!

[@scotty2307]

+furyIIIplate Keep in mind that, when it comes to rubber impellers, it is all about how long they have been on the unit, not about the hours of run time. If a brand new impeller is installed, and then sits for 3 or 4 years, it would be risking your engine to run with that impeller.

[@googleplusisdead]

YES, change it NOW! I ruined my 15hp by thinking it was peeing "enough". It was, 'til it quit, then engine overheated and now no compression... :(

[@scotty2307]

Gogle Plus Sucks I am sad to hear that GPS. This is, unfortunately, not uncommon. When one piece comes of an impeller blade, it often takes the rest with it. It can happen almost instantly. Usually, the first indication noticed by the user is the engine quitting. Most manufacturers specify every two to three years, for water pump service. That means, if you install it, and then let it sit for three years, replace it again before you use it.

[@StevenHelen49]

Very excellent instruction, presentation and filming. Thank you so much for for such an excellent job.

[@The1979jeff]

Great video. Helped me service my 1973 Mercury 110 9.8 HP.

[@condor5635]

Great job ! I have a 1990 Yamaha 9.9 low hour motor that has never had a new impeller and this is something I have been wanting to do for months! Will do this sometime this week since we are quarantined! Parts for that old of a Yamaha is what I am worried about finding. Excellent work. Thanks again Donyboy!

[@grantdawson9262]

Awesome video. Clear instructions on ALL steps. Thanks heaps for making this.

[@bobm3712]

This is one of the best done video I’ve ever watched ,I couldn’t expect any more to fix a water pump. Will be checking out your other info videos. Thx

[@ejericj1]

Nice vid! Didn't get mine installed unfortunately.. tried for over 2 hours to get the impeller fitted but just couldn't get it in and over the key really annoying job to do. To make it even worse the old impellor was working and looking fine, thought to do some preventive maintenance. Ended op with no cooling at all haha. Will try another time to get it fixed.

[@Altamahacat]

Another great video. I've learned so much already by watching your videos.

[@derekwallace8825]

Excellent video as indeed your other ones are. I watch them most evenings. I have a Yamaha 6HP 4 stroke. Thanks a million for sharing. Learnt so much from you. Derek

[@Dinkymaster7]

I've done this thousands of times on these 9.8 mercs. And yes, you are right, it's really a pain to get the lower unit on as well as having the key lined up. That looks like a good motor you have there, take good care of it!

[@donyboy73]

+Dinkymaster7 thanks, just sold it to a friend of mine

[@CaptMarkSVAlcina]

This is the best I have seen but when you put it back together you added a white tube to the water pipe ( I thing it was the water tube) but it was not there when you open it up the first time . Is this something you added to help Guide it back in and then it stays there?

[@clintellison2096]

Thank you . That zip tie was the only way to do it . very good job Dony. I could not have done it with out you.

[@michaelcharlebois835]

Great video Don. It helped me replace my impeller. I have a 1985 Mercury 7.5 hp outboard. It leaks oil out the propeller hub after I have used it, but it’s not coming from the gear case? Any ideas why this is happening?

[@ronedge9659]

Superb Video! As Mitchell mentioned that he's a mechanic, well, I'm definitely not - but I feel that I can do tackle this job now that I watched your video. Fantastic job and Thank You!!

[@donyboy73]

Go for it!

[@bhardwaajmohabir9147]

Very nice thank you for showing it on you tube have a nice day.

[@coloflyer6425]

Excellent instructional video from start to finish....thanks for taking the time to do that for us!

[@newf7777]

awesome video!! I have a question for you. What's the threaded hole right behind the lower gear box nut?

[@googleplusisdead]

Another great video, thanks! Wow, Merc sure is easier than my old Evinrude, takes 6 bolts to remove lower unit, and then you have to remove the shifter connector, a real pain and often stripped by folks since it's just brass. And reconnecting that is a whole trick in itself as well. However, having two very similar impellers for the engine is a bit weird, glad you pointed that out. I'm assuming you could have just checked the shaft itself vs. the inside diameter of the impeller. Lastly, I'm surprised you could blow air through the top with the thermostat in there.

[@Tone58]

Great video on this topic, the best most informative I've seen yet. I have a 2012 merc 2.5 hp four stroke. I replaced impeller easy enough but I screwed up the shift linkage also I didn't know the shifter would move while replacing impeller, it did move. Now when I start it it stays in foward gear, I have no neutral , what can I do ? Thanks in advance

[@robertmaser1337]

Great video, excellent close-up shots! Is it possible my 1981 Mercury 4.5hp turns counter clockwise, or did all Mercury's from this era turn clockwise (as your video depicts)?

[@mudman4353]

Great video. Now what if the gears were turned? How do you realign the gears to put back in?

[@mackeating]

Great video also before you assume it's a bad impeller check all tubing that goes to the thermostat and tell tail to make sure there are no obstructions. Sometimes sand can get clogged in the line

[@mackeating]

Probably should of watched the whole thing before I commented

[@googleplusisdead]

:)

[@Budro4764]

Wow talking about bringing back memories with that old motor and the work horse 20 HP merc That was back in my trapping days in the late 70' s and early 80's. Also the 15 Evinrudes purred like kiity kat . Merci mon ami ~!~!

[@massimilianogiannone8417]

Hi, I bought the exact same engine and I am very happy with it. Since I have to replace the propeller, could you give me the right measurements: pitch and diameter? Thank you very much

[@markabolt15]

Just changed the impeller on my 1975 Mercury 7.5hp outboard and this video was a HUGE help. I did run into the problem that after I re-assembled the lower unit, the gear lever stays in reverse and won't budge. I also noticed that the propeller spins counter clockwise with some resistance (and clicks going clockwise) which I assume means the prop is in "forward". Can you shed any light on that? Is the drive shaft not aligned properly? Have tried multiple times times to remove/re-attach with no luck.

[@robertknowles2699]

My 1975 Mercury 75 7 1/2 hp struggle was simular. The plastic bevel gear on top by handle was replaced expensively. The sleeve Dony shows is about 3 in. long slid into pump output hole. Lining this sleeve to brass water pipe is first, assuming leaving gear shifter in f'd before disassembling l'r unit as mentioned above. Then shifter should function when prop. turns freely in neutral before cranking.

[@joshhartelt7022]

After watching the video here I took apart my mercury engine (slightly older model) and got the impeller to sit properly in it's housing once again. When putting the lower end unit back in place it was tough going, but once I got the bolts tightened up I went to start the engine and the shifter wouldn't move. So I went to take it apart again to see what's the matter and now it won't come apart (but it will shift into reverse now). Not sure if I pry on the lower end unit or take it to a shop?

[@davidfriesen7748]

The best video, I have seen, after a dozen !?!

[@ryanroberts2166]

Hi donyboy73 how is it than when you put pressurised air up the copper pipe to the engine block with the flush bung screw in place it still blows out out of the tell tale hole? I thought this wouldnt be possible due to the fact the thermostat would be closed as the engine would obviously not be running or warm during the impeller changing process, Is it prehaps a small amount of air blowing though the jiggle pin in the thermostat?

[@Markarb27]

I do this almost every year on mine. Thank you for the visual, great refresher. Why would it matter about how the fins are clock wise or counter clock wise? Wont it change when going in reverse?

[@GYPSY400]

Mike Baker No.. the long shaft is connected to the engine directly so it doesn't change rotation.. You want to install the impeller in the direction the engine turns as shown

[@arkansasoutdoorsmen5433]

Do you think it would be difficult to replace the switch box? Also do you think it would be worth my time to go ahead and replace the impeller before trying to start my 9.8? Thank you for a great video Don.

[@mckessa17]

I have a late 60's red stripe 9.8 Merc but your video helped thanks.

[@russhebert916]

I have the same outboard and I have to replace the Venturi in the carb. Any tips? Thanks

[@saxon6]

Well done video! Succinct narration, very clear and up close images, helpful hints with directions. I only subscribe to 2 channels and this was the first.

[@mcmaster22]

You amaze me every week. Thanks Dony and have a Great weekend.

[@donyboy73]

+mcmaster22 thanks

[@alfredboyd1]

Brilliant video... well done!

[@jkmvenice]

great video, you do a real clean operation.

[@roybeebe9744]

Can you advise what the problem would be if in forward gear and the prop will still turn? Took it out and ran like sher pin was gone, took the prop off but don’t see where the pin would go. Sure hope the shaft isn’t striped out.

[@gordonpeden6234]

Dony another great vid, thank you so much, I've gotta change the impeller on my Mercury. I'm used to evinrude/Johnson Merc is a bit different. Good work, you are the man.

[@socantoo]

Very informative and a very professionally presented and filmed video..thank you.

[@donyboy73]

you're welcome

[@arciefan]

Is water bypassing the thermostat somewhat on start up, which makes it come out the tell tale or peep hole? Reason I say that is most motors show you water almost imediately. Another super nice video btw!

[@scotty2307]

+arciefan Some do, and some do not. Most newer motors do, and even spray loud enough that you can hear the stream hit the water, at least at lower RPMs. My 1977 70hp Evinrude doesn't even have a telltale. I just have to rely on the buzzer.

[@juanlondono1302]

Hi, I bought a Mercury 7.5 hp engine but it didn't bring the thermostat and I would like to know if you can show me a thermostat for that engine thanks

[@benbanman2111]

Great video....really well made with clear instructions. (keep the Merc outboard videos coming!)

[@LLStacheLarry]

Can you doing anything that happens with a small outboard even electrical? ? Do you work on allot of outboards?

[@nicholasdavis445]

Hello, I have a 1976 Mercury thunderbolt 7.5. Would the impeller be the same model as yours. Both engines look almost identical. Im new to outboards.

[@PRACERZ]

Fantastic vid, thanks a ton !! Keep them coming.

[@brynmitchell5774]

Super vid , thank you , methodical for us newbies .

[@umajunkcollector]

It's spring time, get the boats seaworthy. I was surprised at how small the water pump and tubing is. That's one hellova washing machine! Don

[@donyboy73]

+umajunkcollector yes lol

[@sumnerbrent]

Really great video, so well done. I just did the repair and it solved my overheating problem. Unfortunately, now my gears give me forward in the forward position, forward in neutral, and neutral in the reverse position. Basically, I've lost reverse. I can only imagine I shifted the gears after pulling off the bottom. I know the shifter was in the neutral position when I was putting the bottom back on. I'm not sure how to correct this. Does anyone have any idea? Thanks.

[@francimasaza8749]

the transmission should be forward

[@spacecadetzack]

In the package you were using there was an oil seal and 2 o rings. One o ring went at the top of the shaft, where does the other one go? I have the same kit and don’t know where the third o ring goes.

[@danielsvensson356]

Hi just replaced impeller on my Evinrude yachtwin 3hp 1968 but when Im testing the engine it does not pump so much water.But there was some exauststeam for sure.The engine doesnt seems to overheat etiher by the 10 minutes i was testing it.Any idea?

[@dancin4]

Nice tip with the zip tie. 3M on die grinder is new to me. I like to use dish soap on the inside of the impeller housing to ease sliding the rubber impeller into position. Could also use it on drive shaft for seals. Evinrude's are much harder to put the shift linkage back together (40HP 1990).

[@donyboy73]

+Dan Sisulak thanks for the tip

[@markfoley2186]

Yes, Don great video I wish I would have seen it last weekend!

[@PhillipHall01]

Just what i needed!! thanks!! do you have a video cleaning the carburetor on this same size engine?

[@302vettelife2]

To say they don't always come off that easily is an understatement!

[@pokemonmaniak660]

i have a question about carburator dellorto sha 16.16, first are they ok for a 50cc, second can i drill it to 17mm also is it a good idea. (i know all the small tunning that needs to be done like putting bigger jets or soo) thx

[@richniz5145]

the small keeper ring on the top of the shaft seems to be missing on yours allowing you to easily slide everything off, is this essential?

[@sammyrothrock6981]

You always do great repairs! Can't even understand why 40 dislikes?

[@HOLLESjr]

Great Video Dony, nicely done.

[@kevinnorthey6183]

Great job explained everything clearly !

[@dt9094]

Thanks for this. However when I was replacing the impeller I must have shifted the gear shift because when I start in neutral it’s already in forward gear. So........ remove leg move shifter back one coug than reinstall. Would I be correct? Thanks

[@troyladoux1953]

Great video. Where do you order your parts from for this motor and where can I get that 3M grinder tool?

[@ng4410]

just did older one Aussie here. had to build up non stainless corroded shaft. no flow out of telltale after fix. Took out silver flush plug and ran it. pouring out of that so knew impeller working. Blew out with air and wire pushed thru across the open flush hole and telltale. are it seems same internal water line just are 1 inch apart. fixed flow issues. impeller tiny on these . Also made 4.pronged undo tool for trap thread ring near prop. when i stripped gearbox. parts 50 bucks my labour One thousand

[@Catfishbill66]

Great video this just happened to me and I wanted to fix it myself and this is my first time this happened so thank you

[@petersaupe7455]

I always lube the impeller and o rings when I install the new impeller as most wear is caused by dry start ups.I also pull the motor over without ignition on so as to prime the water system on every start up when the system has had a chance to drain down.

[@grantw.whitwam9948]

That was great, you made it look easy, never knew how those worked.

[@donyboy73]

+Grant W. Whitwam thanks for watching Grant

[@motomizfit2892]

Thanks this vid helped a lot! I have the exact outboard and followed ur video and now I’m good to go! Thanks a lot!

[@corygumpert]

What model is this outnoard

[@w.c.6678]

Good job. Thanks for your time! Very informative!

[@CourtnRob]

I'm not sure why I watched this, I don't even own a boat! Another great video!!

[@FUMRSDAISY]

I feel like I should pay you for fixing my motor! Thanks!

[@krismeyer74]

Awesome video very informative. helped me out a lot. Thank you for being so detailed.

[@danmcginn772]

does it matter what gear the motor is in when you take the lower unit off? some people say reverse?