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Old 01-24-2006, 09:04 AM
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I have a 1997 Mariner 115 hp outboard. I have a problem with my trim and tilt and my mechanic is stymied. My problem is as follows-- The pump motor runs fine. The trim portion of the trim tilt operation work fine. When you try to tilt the engine the engine will move through the trim portion of the operation with no problem but when it reachs the tilt range the motor just runs and the engine will not go up any futher. If you pull up on the lower unit with some force while the tilt motor is running it will come up. The same holds true when lowering the engine from the up position downward. I have check the obvious and the unit has fluid. Also when the "bleed down" screw is backed out the engine will not come down by itself. The motor is obviously pumping in the proper direction but appears to be bypassing the fluid internally and has a minimal pressure. Help?
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Old 01-24-2006, 04:40 PM
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It could be valves in shock piston in tilt cylinder, gear pump or relief valves. I would probably start with piston in tilt cylinder.
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Old 02-01-2011, 09:48 PM
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Old 02-11-2011, 08:02 PM
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The 115 trim unit is not very powerful, especially in the down mode.
I would suspect the tilt tube is stuck, try loosening the nuts on either side, raise the motor, then applying heat and see if the motor tilts down by itself with the manual relief valve open.
If not pull the TNT unit and take it apart, try running the pump (valve body) in mineral spirits. Maybe some debris lodged in it. Also pull the manual relief valve completely out. it could be broken off inside of the valve body or have broken O ring/s.
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