Trim and tilt dropping on '86 135hp merc

AndrewB

Seaman Apprentice
Joined
Nov 3, 2002
Messages
39
Just wondering where should I go from here, my trim and tilt drops on my 135hp black max merc. It a 1986 model, Ive had the end cap and supposably all o rings replaced and the thing still drops. (Right down, just not to the trim prods) Twice Ive been told that its the o rings on the manual override but they look fine and is as tight as it gets. The system has been drained, filled and bled but still drops. It must be a slight leak though, I just had the lower unit off and basically didnt drop at all, but with the extra weight of the l/u it does. I was just wondering what the next step would be, seeing I constantly am using the trim, on one hand I think its not even worth persuing, on the other hand Ive spent all this money with no result, any ideas???
 

clanton

Rear Admiral
Joined
Jul 9, 2001
Messages
4,876
Re: Trim and tilt dropping on '86 135hp merc

Its the pilot check valves in the hyd pump body, Mercury does not service these valves,but there is a fix. Try search. If you have a manual it shows the valves, but not to scale. Only need about 20.00US for seals.
 

AndrewB

Seaman Apprentice
Joined
Nov 3, 2002
Messages
39
Re: Trim and tilt dropping on '86 135hp merc

Thanks Clanton, you sound pretty definite about that, will give it a go, sorry bout the late reply, I've been out of town
 
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