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Tilt&trim 1981 merc
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I have just replaced my tilt amd trim motor and valve assembly. I have all the lines on correct and have filled the pump and run the pump "it works" motor goes up and down "but" when it is in the up position it will drop to full down in about an hour. I would like to know if their is a trick to fill and bleed the pump and lines everything seals tight and I have no leaks. I used 20w oil like it says to with out detergent. The motor is a 1981 merc 115 the pump has 4 lines under it with 2 cylinders to raise the motor. Pump is used and worked when it was taken off other motor.
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