Trim works, but engine lifts in reverse

[Blue Bomb]

I have a 79 IMP with 228 Mercruiser. The trim runs up and down. There is fluid in the trim reservoir. My problem is when I shift to reverse the thrust lifts the sterndrive and when I shift to neutral, it clucks back down. On the trailer, I can shift the engine into FWD or RVS and I can lift the motor, but I can't push it down past the set point. I filled the reservoir and ran unit up and down many times without improvement. Do I need to do a full bleed or is there some other part I need to address.

 

[Bt Doctur]

Either air in the rams or worn O rings in the rams

 

[Starcraft5834]

any oil leaking? from the trim motor out to the connection point to the rams? pressure loss

 

[wahlejim]

Seals in the ram or I believe you have the MC-1 Drive, check the manual for calibrating the reverse lock valve. On the 228, it is the port side, by the DC. Shift cable is attached to it.

 

[Blue Bomb]

Thanks. I'll try the reverse lock adj first to see if I can get it sorted out. If not I'll rebuild that cyl.