Power tilt creeping/motor sinking.

[ILLaViTaR]

Hey guys.

Just trying to fix my power tilt, it's a 1972 Evinrude 100HP. It's the older power tilt type (not tilt/trim). Basically if I tilt the motor up it'll slowly drop/creep back down in a space of 10 seconds.
Now the rams work beautifully, the motor tilts up and down great however the hydraulic side of it seems to be failing, I can't spot any oil leaks.

The manual release valve is confusing, it doesn't completely screw in or out, I feel some resistance then it just keeps turning like a stripped bolt, unless it's directional?? It's always best in the diagonal position anywhere else and the motor instantly drops.

Finally I took out the oil filler plug out and red fluid (looked like 95le transmission fluid to me) came out, I ran the tilt up and down a few times and it actually takes far longer (a couple of minutes compared to 10 seconds) to creep down now. Seems as though I bled some air out or something.

Do I have air in the system or something similiar??? I'd keep tilting it up and down but I'm not sure if that's the right way to bleed it. I don't want to damage it now I see it might actually be repairable!!

Anyone know what the next step is??

Thanks.

 

[Faztbullet]

Re: Power tilt creeping/motor sinking.

Now the rams work beautifully,

When you say "rams" that is a tilt/trim unit as a tilt only has 1 ram. Bad news is there are very few parts available and what is are quite expensive.

 

[ILLaViTaR]

Re: Power tilt creeping/motor sinking.

Sorry mate I could be reffering to the wrong thing, it's the older power tilt (apparently tillt and trim came out in 73), it has 2 rams/hydraulic strut like thing that tilt the motor up and down, then to the side of the motor there's a hydraulic pump/canister thing that holds the power tilt oil (has a manual release valve), which I think is the problem as there's no oil leaks and the struts/rams operate up/down perfectly.