trim pump on 1972 mercruiser 888

[ImaDirtyBoater]

I just finished a major rebuilding project on a 1972 peterborough with a mercruiser 888 outdrive with a ford 302. I had to remove the engine to get at the transom for repairs. Every thing went back together fine as I took alot of digital pics along the way for reference. My problem is with the trim. It works fine except for when the boat is in gear, it will not trim up. When it's in neutral, the trim operates perfectly. Up or down. When its in gear, it will not go up, only down. What should I be looking for?

 

[Bondo]

Re: trim pump on 1972 mercruiser 888

It's that Funky Looking Reverse-Lock Thingy mounted on the Transom, with the Light-Weight Tubing running to it.......

It's Either,.... Not Working Right,.... Or Out of Adjustment.........

 

[ziggy]

Re: trim pump on 1972 mercruiser 888

i guess there could be lots of reasons.

a-unit not in neutral or forward gear
b-internal resistance in cylinders
c-drive houseing interference with gimbal ring or tilt pin
d-low battery charge
e-improper wireing
f-proper switch not operated
g-solenoind inoperative
h-high resistance or broken or loose connection in wiring, grounds, or solenoid
i-defective key, push button, or rocker switch
j-oil level low
k-external leaks, (fittings, parts leaks)
l-too low or no pump pressure
m-pinched or broken hose

mecanical
a-improperly adjusted reverse lock valve
b-unit not in neutral or forward gear
c-drive houseing interferance with gimbal ring or tilt pin

electrical
a- limit switch open or disconnected
b- defective push button or rocker switch
c- defective trim motor solenoid
d-proper switch not operated

hydraulic

a-oil level low
b-external leaks (fitting and parts leak)
c-internal cylinder leaks
d-too low or no pump pressure
e-reverse lock valve inoperative
f-inter resistance in cylinders.

this info is out of mercruiser vol. 2 trouble shooting guide for tilt trim systems......

 

[Haut Medoc]

Re: trim pump on 1972 mercruiser 888

What Bondo said......
The reverse lockout switch......JK