power trim

dimitry

Cadet
Joined
Sep 8, 2002
Messages
7
i've noticed that over short period of time (10 minutes) my 115HP Mercury motor little-by-little tends to move down when trimmed up. Is there a problem with the hydraulic system? How do I fix it?<br />thanks guys
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: power trim

Merc. Troubles topic.
 

dimitry

Cadet
Joined
Sep 8, 2002
Messages
7
Re: power trim

Originally posted by dimitry:<br /> i've noticed that over short period of time (10 minutes) my 115HP Mercury motor little-by-little tends to move down when trimmed up. Is there a problem with the hydraulic system? How do I fix it?<br />thanks guys
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,449
Re: power trim

Dimitry, There are usually two causes for this. The most likely cause is a leaky piston seal in one of the trim cylinders. You may be able to get a rebuild kit to cure this, but it may require special tools to install the piston back into the cylinder, after you replace the seal. You will also need to isolate the problem to the correct cylinder (if you have two). The other cause is a defective control valve in the power trim pump. I do not know if this can be repaired, it may just need to be replaced.<br /><br />It would be helpful if you posted the year of your motor and described the trim/tilt system. It wll be easier to assist you.
 

timmathis

Lieutenant
Joined
Apr 24, 2005
Messages
1,295
Re: power trim

I had A looe fitting and mine would go down .Be carefull and don't overtighten.
 
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