I have noticed over the past several years that my motor (Yamaha C60 (99-00 vintage) Remote Steer) will "leak down" and you have to hold the up tilt button for quite a while before it will actually move the motor up. Usually this is only an issue if the boat has been unused for a while (I do use a lower unit brace when trailering and storing) but here lately I have also noticed that when running on plane I have to continually "bump" the trim button to keep the motor raised up as far as I would like. It is "leaking down" when on plane.

My question is, is the piston rebuildable in the T/T unit? I have to think I have a seal or O-ring(s) that the fluid is going past in order for it not to hold pressure. I have attempted to add fluid and bleed air in the past only to find that I cannot add more fluid. So seals/o-rings is what I am thinking have gone bad. I have attempted to attach a diagram of the unit. I really do not want to spend $500+ to buy the whole piston sub assembly (20) and would rather replace whatever the wear items (18, 19, 21-26) that will help stop the loss of pressure that leads to the motor falling down. POWER TRIM TILT ASSEMBLY - 1999 Yamaha Outboard 60hp C60TLRX | Crowley Marine

Name: tilt trim diagram.jpg Views: 1321 Size: 73.7 KB

Thanks in advance.