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tilt/trim problems

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My 1990 mercury mariner 115 will trim up and down but when you trim it up the motor slowly falls back down to the tilt tabs. Anyone ever had this problem before. The reservoir is full of hydraulic fluid.
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Re: tilt/trim problems
no mechanic at all!!!! seems like if you have no fluid leaking anywhere, its got to be something electrical allowing the motor to trim back down on its own???? like a short in a switch or whatever???? good luck!!!
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Re: tilt/trim problems
most probable causes would be a blow piston seal , loose nut that holds piston on end of shaft or the emergency bleeder needle valve not seating properly ----
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Re: tilt/trim problems
There usually is a screw on the side that allows you to drop the motor if your trim ever gets stuck. That could be loose
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Re: tilt/trim problems
When I had this problem, on more than one motor, it was a bad seal. Older motors, like yours, tend to develop this problem. It ain't gonna get better with time.
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