Mercury Mariner Tilt / Trim

[captainron19]

Dual 150 Mercury Mariners (1989)

Power trim on starboard engine does not raise to the same height as the port engine.

Seems like the 2 smaller pistons are moving it up but then I hear a clunking sound (almost like the unit is being caught on something but it does not appear to be)

I can see on port engine that the 2 small pistons raise it up until the point where the center larger piston takes over into more of a "trailering position" i believe.

Just picked the boat up yesterday..... although it did raise up enough to safely trailer the boat i would like to get it up as high as the port engine.

looks like the 2 smaller pistons are extending fully but the larger center piston isnt taking it up the rest of the way.... checked the hydraulic fluid and level appears ok

Any ideas?

 

[guyjg]

Seems like the 2 smaller pistons are moving it up but then I hear a clunking sound

Cylinder seals may be leaking.

 

[captainron19]

Thanks will look into it.... a few people have told me they believe it may also be in the check valve for the 2 smaller pistons not allowing the fluid to move the tilt piston up