TOPIC: power trim issue

So my 65 Merc 1000 seems to be running well now thanks to all the great people on this site. However I have been having a problem with the power trim that I have neglected in favor of spending time on the beast of a motor. It lowers the engine fine but doesnt want to raise her. I have added fluid (brake ) and "bled" a few times . It hums like its working , just no action. I have noticed that the ram on the starboard side has had some putty applied near one of the connections, but doesnt seem to leak to much from there. maybe a drop or two here and there. Lifting the 300 plus pound motor by hand is starting to annoy me. Also I cant adjust tilt during operation which is a downer. Any Ideas where I can start /

make sure the knob on the pump is in the correct position out or in. cant remember it has been a long time. and make sure the rams are not rusted or corroded on the pivot points at each end.just for a start.

Wait, did you say you put brake fluid in the power trim system?

I recently worked on my TT for my 1400, probably same dual pistons.

My right piston had a leak and it did the same: would run but the single piston wouldn't push it up.

When you run it after bleeding it do you see any fluid leaking anywhere?

If you take the bleed hose and run it you should see fluid squirt out I think.

Yes, check the knob also (probably first).

not the knob. tried both directions. yep , brake fluid, hydro fluid is non exsistant up here in the mountains. When i say I bled , I left the fill screw off and attempted to operate the trim up and down. Is that not right ? did not use a hose ...

If you can manually tilt the motor up with the trim system installed you either have the relief knob turned the wrong way, the brake fluid is too thin to operate the pump, or an o-ring may have failed in the manifold.
NEVER open any of the allen head set-screws, little screws holding the base of the reservour to the pump's to the tank, or anything else other than the (4) 1/4 x 20 cap-screws that hold the manifold assembly together.
These pumps work well on 10w-30 motor oil, but you will need to purge out the brake fluid first.
Fill the pump with oil when tilted up & temporarily secured on the tilt stop lever assembly.
Once full, (not a problem leaving the fill hole open) release the tilt stop lever, manually tilt (push) the motor down. It should only lower less than a foot +/-. Then attempt to tilt the power trim UP until it stalls. The angle of the Merc may not change, but the pump should stall (lug down).
Thom

Thank you Thom,

I have been releasing the relief valve to raise by hand, then I re engage while operating. Can you PLEASE tell me how to purge the system of the brake fluid so I can refill with oil ? Would love to get this sorted before my september Lake Powell trip.
Jay

disconnect the lines and run it and add oil to flush do it a few times and it should be good.

Thanks dave, Turned out its transmission fluid not brake fluid. not sure if thats any better tho ....

do I want to disconnect all four lines ??

yes then hook up 1 on each cyl to flush out the cyl's

so is the tranny fluid any better off than the brake fluid ? should I still purge and refill with 10w-30 ?

i would and then you can see if it is pumping at all.