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Old 21 April 2012, 11:23   #1
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Impeller replacemt

Hi I'm about to replace my impeller on my 1991 25hp mercury. This will be my first attempt to work on an outboard motor, I work on cars for a living and hope this job won't be too much to take on. Anyone have any suggestion or tips on the repair, I was able to look up and find the repair manual online and it seem pretty straight forward
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Old 21 April 2012, 11:31   #2
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watch what you are doing, it is easier than you think, the hard part is thinking about it, team tip use marine grease on all the fixings as it makes it easier to strip down next time , and NEVER run the obm on dry land always make sure it is in water also there are lots of posts on here on how to do as well

good luck
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Old 21 April 2012, 11:36   #3
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Sounds good but don't run the motor on dry land??? I have a snorkel/muffs for the motor wont these be ok to first test the motor before taking it out on the water
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Old 21 April 2012, 11:42   #4
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run it on muffs ok , but i have heard people run them without muffs that is what i was trying to warn you about, some people say its ok for a few seconds to run without muffs ITS NOT OK
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Old 21 April 2012, 11:45   #5
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i use muffs, just make sure there is a tell tale from outboard!

oh and make sure you turn the tap on........you may laugh...........ive done it!
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Old 21 April 2012, 14:38   #6
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Lol thanks everyone will keep those things in mind. How bout when actually doing the job any tips or tricks to help it go through smoothly, I've read that some ppl put it into gear before they put the leg back on so it's easier to line up the splines?? Do I put it in gear before I take it out or right before I put the leg back on
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Old 21 April 2012, 16:15   #7
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Can't remember how yours selects gears, but if it's a bolted together shift shaft you unbolt halfway down the front of the leg there's usually only one position it'll go back in.

If it's a twist type selector and you've got remotes ,I do it in neutral as both the splined shafts won't have enough potential to move to get one spline out in. You'll need the cowl off and long arms if you do though as you'll probably need to turn the flywheel slightly to line up the splines on the driveshaft.

Don't overgrease the end of the driveshaft either, it'll airlock and you'll be wondering why it won't go all the way in.
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Old 22 April 2012, 00:15   #8
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when the others posted earlier they mentioned using Marine grease ! it's important,
Just that as you said that you repaired cars for a living don't be tempted to use any Copper based grease on the engine especially anything to do with the water side of things as it can cause galvanic corrosion or be tempted to wipe over the zinc trim tab with any excess grease .
Mart,.
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Old 22 April 2012, 00:23   #9
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Yes I'm planing to use 2-4 c with Teflon as recommended for my engine.
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Old 25 April 2012, 19:35   #10
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Hi just got into the job and found out the guy at the boat shop gave me the wrong part, I guess I have the international engine, so now I have to wait for a few days for the part to be order. Other then that are there any other things I should service or look hike in doing work in the motor. Any recommended service, so far I have changed the lower leg oil, both spark plugs and fuel filter. Anything else I should look into
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