[Brett]

It's a hydraulic piston. As seals wear they leak.
The factory shop manual shows how to do the rebuild.
Includes pictures and tools needed to complete job correctly.

 

[cutrunner]

You will need the right size spanner wrench. One seal and one wiper.
Also inspect piston for pitting or scratches, as those are what hurt the seal 90% of the time, and will destroy new seals as well. Also a decent understanding of the trim system is needed when filling it back up, or you can burn it up.

 

[swaddict]

Thanks guys, what size spanner wrench and is that something I can get at an auto parts store

 

[cutrunner]

Honestly i dont know what size spanner wrench it needs cuz i have the yamaha tool..
And ive never seen a spanner wrench at any auto parts store. I think you might have to get it off of a snap on truck.

 

[Creek Runner]

I'm going to say take it to a shop, Trim and Tilt systems can be very difficult to work on. I am a factory trained marine technician and I probably hate trim systems the most.

 

[cutrunner]

Oh come on.. Trim systems are fun! Especially showas!

 

[swaddict]

decided to drop it off, the spanner wrench was going to run me $70 - 80 (for the 4 prong), ended up costing me $123 to get both pistons serviced with new seals/o rings, thx for the advice