I’m going to replace the rubber impeller in the water pump inside my old 1980’s Mercury 90 HP outboard boat motor. This involves removing the lower unit, taking it apart a little bit, then re-installing it back on the motor. This maintenance will help insure your boat motor runs nice and cool as designed.
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Hey mate any chance i could ask you a few questions? I have the same motor just the 115 model
When the lower unit does not go all the way up, slowly bump-bump-bump it softly up as you barely turn the prop just a little until it slips all the way up. Something turned the prop just a little, probably the garbage can, if NOTHING moves, they usually slip right in. When it doesn't, just a small fraction of a turn, and pop, it goes in. Motor should be in reverse in this process. Also, next time antiseize the bolts.
Just Curious, how long did the job take??
Do you have a link for the impeller kit you used
I am currently struggling to get the lower unit off.. its in neutral – does it has to be in gear ? Did you touch the linkages at all ? Thanks
P.s. use soap not grease.
I’m still looking,but I’m pretty sure it has to be in a gear or neutral, can’t remember which that’s the reason why I’m watching videos. I don’t remember why it’s important.
That’s impeller is shot. Compare it to the new one. Once the vanes stay curved then it’s pretty much spent.
No grease on top!
It can cause the shaft not to completely seat properly
I wonder if the shaft key came off the impeller and that caused it to not spin and suck water. – Thank you for the video
Do you think this will fix the water not coming out of the hole?
Yea no… that impeller is not perfect. It's old.
You forgot the housing/shaft seal.
I have an 1989 mercury 80hp, can't find anyone who sells the impeller, where may I ask did you get yours, thanks
For the love of boats and all that floats…I've watched 6 videos about removing lower unit on merc outboards and absolutely none of them explain getting the shift linkage off…
is the prop on your boat the "Stock Prop" if it is, what pitch
Marine grease? Do you mean lithium grease?
Did you have to drain the 90w from the lower unit first?
Curious if you were to twist the prop a little to align the gear/shaft, if that would have made it slip in easier?