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  1996 Merc. not holding trim ?

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Author Topic:   1996 Merc. not holding trim ?
reeltime2 posted 12-26-2001 08:53 AM ET (US)   Profile for reeltime2   Send Email to reeltime2  
The motor I just bought for my 1984 15SS is not holding trim position. If I trim it up it will drop down after about 5 min or so. Anyone have any idea what could be causing this?
reeltime2 posted 12-26-2001 08:54 AM ET (US)     Profile for reeltime2  Send Email to reeltime2     
Forgot to say its a 75 horse.
Peter posted 12-26-2001 09:12 AM ET (US)     Profile for Peter  Send Email to Peter     
If it is dropping gradually over the 5 minutes then you probably have a bad seal in the hydraulic ram. If it is quickly dropping at the 5 minute mark as though somebody pushed the trim switch, then I would guess you have an electrical issue.
hauptjm posted 12-26-2001 09:45 AM ET (US)     Profile for hauptjm    
I had a similar problem on an OMC unit. Turned out it was the seal on the "check" valve. On the OMC, it is near the top port side. It's used to fill/bleed the unit with fluid.
Bigshot posted 12-26-2001 10:41 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
It's your check valve. Cheap and easy to replace if you can get to it. On my Yamagucci you have to remove engine. Takes 5 mins to replace once accessible.
Clark Roberts posted 12-26-2001 08:51 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Adding a couple of ounces of "automatic transmission fluid conditioner" (from auto parts store) to the power trim fluid may swell up the seals and solve the problem.. like chicken soup ... can't hurt! And it has worked for me! Just a thought.. Clark.. Spruce Creek Navy
reeltime2 posted 12-27-2001 08:40 AM ET (US)     Profile for reeltime2  Send Email to reeltime2     
Thanks for the help guys I figured it had to be an internal seal because its not leaking any fluid. I guess im off to buy a repair manual & see what it takes to change the seal.
reeltime2 posted 12-27-2001 08:42 AM ET (US)     Profile for reeltime2  Send Email to reeltime2     
Its a 1996 merc. 75 horse anyone have a manual they want to sell?

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