Replacing the Impeller on a 2002 Mercury 90 hp Outboard

Replacing the impeller in my 2002 Mercury 90 hp ELPTO. Tell tale stream seemed weak and it was time anyway.Surprise findings when I got it out!

[@tuber5129]

I'm going to comment here so that another "home mechanic" researching this topic doesn't have to go through the pain that I did. First of all, thanks for making this video. I watched several videos before trying my impeller change for the first time. So long story short, nowhere in the the service manual or owner's manual does it say to drain the engine oil before dropping the lower unit. To my surprise, I had a flood of engine oil pouring out when I removed the shaft and dropped the gear box. I tried to research the problem on line and found a few people who had the same problem, but what they were being told was they had a costly engine oil leak and would need major repairs. This just didn't sound right to me, because I could see a hole at the top of the opening where the drive shaft stops, and my motor wasn't leaking before, so I started to do more research. I won't go into detail, but the bottom line is that at least on my 2013 115EFI Four Stroke, you need to drain the engine oil before removing the gear case. I confirmed this with three different Mercury certified mechanics and called Mercury customer service. I realize that a 2002 90hp may be different than a 2013 115, but I just wanted to mention this so someone else doesn't make a mess like I did.

[@MrJockoDundee]

There's no engine oil in a 2-stroke. That's what the ELPTO is.

[@RetrieverTrainingAlone]

No need to drain the engine oil on my 2008 60HP EFI Four Stroke...simply remove the 4 bolts and lower unit slides right off.

[@theTECHYnewb282]

Lol same with my 2014 90HP. Was quite a surprise to do an oil change. Easy $60 mistake

[@SylvainFluet]

Thanks a lot for the video ! Boat newbie here that need a video like yours to understand how to do it. I don't have the history of the outboard so I will change the impeller. Your video was clear, simple and well made. Thanks again !

[@mako021]

Thank you for making this video. I have a 2001, 90hp, getting ready to change the lower unit seals as well as the impeller . Huge help!

[@baymocatman]

Great video. No bull, straight to the point. Thank you.

[@richarddiaz8248]

Thank you for your knowledge and expertise

[@Prokastrynator]

I bought an 2006 pontoon with this exact engine. Thank you for showing me all this.

[@TheFritz423]

Hope it helps!

[@christollefson1527]

Thank you for showing what rtv and 2-4-c grease and where I should put it when reassembling. Time to hit some waves!

[@Waltsobchak]

Best video on how to do this by far.

[@bigrainbow25]

There's a seal on top of the water pump that is missing...WTH...NOT GOOD

[@RogersFixItBarn]

Good job bro and saved the service fee for some shop.

[@TheFritz423]

Not to mention waiting a month or more. Thanks!

[@TheVisionGreen]

Thanks for information and the steps to do this procedure :-)

[@MalcoDude]

Spot on, thank you for this and most clear video I've seen done on it! Perfect 👌👍

[@davidwhite2029]

If your engine is overheating and you want to check the water pump use a tub of water not a pressure hose---dont ask me how I know--the first thing you should do any way is change the W Pump

[@MRgnargnargnome]

Thanks for the video? Should it be in forward or neutral?

[@urbraveheart48]

The kit came with a few other washers you never showed where they go ?

[@cmack003]

Really good tutorial

[@metisrick5946]

Great video, thanks!

[@TimE-wz5dd]

Great to the point video !

[@craiggouthro3752]

Thank you very much!

[@ESPPsycho]

Thank you for sharing this awesome video. The manual you’re referring to sounds much better than the Seloc I have. Does mercury sell a service manual at a good price? Thanks again!

[@kevinvoyson3028]

Hello, I’m doing my water pump now, it was put together by someone and forgot to put in a few parts, Where do the other orings that came in the kit?

[@TheFritz423]

With mine there were extra o-rings that I believe went below the water pump base.

[@hunkydoryangling8200]

Great video, will help a lot. Need to do mine this year. Not done on a merc before, what position do you leave the throttle in, in or out of gear before removing. Thanks

[@TheFritz423]

The book says forward

[@norcaloutdoor5462]

I like the mounting design. Why forward gear and not Nutral?

[@TheFritz423]

No particular reason other than it's certain you're in forward when the throttle is forward. Neutral can be iffy.

[@AzMovieMom]

other videos suggest using white lithium grease spray...inside the impeller housing. Can I just use that on the bolts too?

[@djpitr]

cool mopeds on the back :)

[@TheFritz423]

Another project...

[@plwaldelap123]

An excellent video.

[@anthonydale4158]

Not so good he forgot top seal

[@PeterMLauer]

I got the same outboard, can you list the part number of the impeller? There are many knockoffs, they all kist only the original p/n for comparison.

[@flmanusa]

Excellent Video. Thanks for sharing. I have a Mercury 90 HP 2 cycle 3 cylinders 2008 engine. Would the Quicksilver part no. you show, be the same for my engine?

[@TheFritz423]

Doubt it. Look up the part number by engine serial number or model and year at marineengine.com. There are schematics there, of course look under lower unit.

[@drcoffee5588]

Question. In your packet of o-ring seals, there a large black o-ring. Where does that used? I done this service twice, always get the o-ring but never found a place to install it.

[@TheFritz423]

I believe you refer to the face seal. kzbin.info/www/bejne/bKmkYZhvos6HqMk

[@ladislavlapin5416]

Thank you

[@dallasbd123]

What propeller is that . I see it has a 18 inch pitch. What brand of propeller.

[@davisghigs6544]

Hello jist saw you video thanks question there's a rubber tube on the outside of motor in the back do you know what that is

[@TheFritz423]

Probably the old speedometer line

[@4spdragtop]

Thanks for great video, I have a.2006 90 4stroke, can anyone answer a couple questions Do I need to drain engine oil? Does shift linkage need disconnecting? Thanks Steve

[@RetrieverTrainingAlone]

No need to drain the engine oil on my 2008 60HP EFI Four Stroke...simply remove the 4 bolts and lower unit slides right off. I put it in neutral before dropping the lower unit.

[@sanekp8526]

Hi. Tell me how to put forward. In what direction to turn the rod on the gearbox. And I for not knowing took it to neutral. Which way the propeller is spinning when you turn forward when viewed from the propeller?

[@TheFritz423]

Clockwise

[@Fxkthisshit]

How do you resynchronize the gear selector on the lower leg with the forward throttle on the helm if they have been altered

[@TheFritz423]

1. put boat control lever into forward gear 2. Twist shift pin on lower unit into the position in which the propeller ratchets in clockwise direction and locks in counterclockwise. (If propeller freely spins both directions it is in neutral, if locked in both directions it is in reverse.)

[@donpeat7707]

any guidance or comments on the torque settings when re-tightening the 10mm bolts and 15mm nuts?

[@TheFritz423]

I don’t use a torque wrench, don’t know anyone who does. After 20 years nothings fallen off…

[@donpeat7707]

All good with that, cheers. Will now get on with the job!@@TheFritz423

[@Firecapttc]

I was doing fine until the 10mm. Anyone have one that I can borrow?

[@Mikeycraddock]

Hello Why do you put it in gear? Does this make it easier to remove the lower unit? I have a 115hp and the lower unit will not come off. I’m wondering if I put it in forward gear will it help.....? Thanks!

[@anthonydale4158]

just watched other video it said if grease is on top of shaft it can get into crank housing area..

[@anthonydale4158]

You put into a gear so you can align the cogs on the shaft to lower end cog by turning the prop when slipping drive shaft fully up into top housing. so you dont need to turn the fly wheel on the motor to make slight adjustment .

[@lancesoltoggio8802]

Do you have to disconnect shift rod before removing lower unit? Thanks

[@TheFritz423]

Not on this model

[@njs97]

No shift linkage disconnecting required?

[@thestruggler3338]

can someone please explain how a USA made Eltpto has all metric fixings?

[@garrettriley3654]

What would happen if you did get Grease on the top of the drive shaft?

[@TheFritz423]

@Theoretically hydro lock the shaft so it can't be removed again.

[@avsky95]

My lower end still come come out after all nuts remove and rubber mallet taps. Any suggestions? Tap harder?

[@RetrieverTrainingAlone]

There is a fifth bolt to remove besides the four 5/8inch bolts....

[@joverly6124]

Sim, próximo do anodo de sacrifício do leme.

[@demetresichinava5088]

👍👍👍👍👍

[@davidremache4105]

How do you know when to replace it

[@stevendevries4186]

You forgot the top shaft seal

[@anthonydale4158]

Did you see there was no top seal on impela cover when he took it apart. And he did not put new one on .same question Why???

[@TheFritz423]

@@anthonydale4158 The "face seal" is pretty much considered an insignificant part. Most people don't mess with it.

[@TheFritz423]

The "face seal" isn't considered very important. But it has since been replaced.

[@morgancure1604]

you only did half the job...why not replace the plate with the seal under impeller?

[@TheFritz423]

I don't believe the plate contributes much unless there is severe damage. Replacing just the impeller is more cost effective. In this case the issues I was having were due to a broken water pipe clamp and exhaust plate corrosion.

[@morgancure1604]

@@TheFritz423 when looking for the impeller all i found was the "kits"...they had all the parts...it gave me the chance of looking at the seal..it looked fine but seeing how it was "new"i figure just replace it in case it might have been worn...it's a well i have the part just do a thorough lob deal

[@morgancure1604]

@@TheFritz423 there are many videos on fixing the impeller and i just watched the one where you rebuilt the mid section of your 90..did you ever do the next one where you installed the lower unit to the build..ive went to ur channel and didnt see the follow up on it...im curious to know what the slide shaft position should be of the shaft under the powerhead..if the lower unit is in neutral when installing...the shaft has to be in alignment with lower unit

[@TheFritz423]

@@morgancure1604 You determine neutral by turning the shaft until the propeller does not ratchet or stop in either direction.

[@morgancure1604]

@@TheFritz423 theres a notch on the top of the shaft that go's to the lower unit...thats where i put it.. then i shifted the lower till i found neutral..i mated them together and it seems to be correct

[@quincypryor2277]

after i put lower unit back on, throttle was stuck in forward do i need to take lower unit back off to fix?

[@TheFritz423]

Yes

[@nikokarac6577]

Why no grease on top of the shaft

[@TheFritz423]

Grease on top of the shaft can cause a hydrolock making it very difficult to remove the lower unit next time.

[@nikokarac6577]

Thanks bud

[@anthonydale4158]

from other video it said grease can get into crank housing area from top of shaft.

[@wbryant11]

Grease will keep the shaft from seating in place, ok on sides, excess will just slide off. Grease on end will get trapped

[@classicbikerx3588]

LOL, book said so but it doesn't sound right so... efit!

[@gerhardscholtz]

Tuber dick... this is for a two stroke or two cycle if you want. There is no engine oil my bud.

[@richardtemby4358]

It ain’t a “ Woodruff key” it’s just a key. Just sayin!!!

[@davidclarke4343]

Thank you!