1983 Mercruiser Sterndrive Trim Tilt Issue

[avbug]

My trim system does not hold pressure. Sterndrive will drop about 2 inches overnight and doesn't hold position when underway. I understand it could be the pump check valve or cylinder seals. Not sure where to start. No external loss of fluid.

Thank you, Bill

 

[achris]

Reseal the cylinders. If it still does it, it's the pump. Without a way to isolate each clyinder (special tools etc), no other way of doing it. But, it is very common for the older Prestolite pumps to have valve problems.

 

[avbug]

Great, thank you

 

[Hoosmatroos]

Rebuilding the Trim cylinders is an easy job. Costs are about $25 per cylinder. Most difficult is to get the end cap off. Use the proper tool and within 2 hours you can rebuild both.