OMC Outdrive drifts down

[High Bidder]

My OMC outdrive drifts slowly down. Takes about 6 hrs to go all the way. Should I replace the O rings on the check valves or is it more likely to be the cylinders leaking past the internal seals? No visible oil on either the pump. lines or cylinders.

[Fishnut]

Have the cylinder repacked, their leaking by.


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[High Bidder]

Last time I changed a cylinder it was so corroded I broke the hydraulic line. This isn't going to be easy. Maybe I'll wait until winter since I'll probably have to disassemble most of the transom mount.