Leaking tilt-trim on 1991 Mariner Motor

Golleysocker

Recruit
Joined
Mar 23, 2002
Messages
4
I have a 1991 Mercury Mariner that the trim slowly leaks down. You can lift it all the way up and the use it.It will work for a while after while going down the lake.
 

clanton

Rear Admiral
Joined
Jul 9, 2001
Messages
4,876
Re: Leaking tilt-trim on 1991 Mariner Motor

If the engine is a V6, most likely problem is pilot check valve inside pump body. You have to take the pump apart to get to these two valves. Inside the pump is a toggle/ seesaw/ rocker arm, that opens and closes these valves, when you remove the toggle count the number of turns to remove nut, reinstall same numbers of turns. All o-rings reinstall from same groove as removed they are all not the same.
 
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