Leaky o-rings are usually only fixed by being replaced which is a pain at the time but think how good it will be when it works properly again.
Or you could do it the old fashioned way
s-l500.jpg
Matt
So I have a Mercury 60 Bigfoot the hydraulic ram for the trim and tilt folds under pressure which from my research is a fairly common problem. I can also see that the most common cause is old o rings on the system.
Is there any cure apart from taking the system apart and replacing those O-rings.
I took the plug out refilled to just overflowing and put the bung back in but that hasn't helped at all. I can still take it outoutline the water but it drops pretty quickly over 2 or 3 minutes down to the lowest position.
Sent from my SM-T580 using Ausfish mobile app
Leaky o-rings are usually only fixed by being replaced which is a pain at the time but think how good it will be when it works properly again.
Or you could do it the old fashioned way
s-l500.jpg
Matt
If you intend keeping the motor for some time Sheik, look into getting a factory service manual. I don't have experience with the Merc ones but if they are anything like the OMC/BRP ones, they are basically "How to rebuild an outboard in steps your first year apprentice can understand". It should cover a full trim and tilt rebuild.
http://boatinfo.no/lib/mercury/manua...-55-60.html#/2
Section 5 if the link works.
The trim units are pretty simple, but, most require a pin spanner to remove the caps, and they can be damn tight, there's also a couple of ball valves in the bottom that will fall out if you're not careful, but basically it's simple.
Here's a link to the front page, drill down from there.
http://boatinfo.no/lib/library.html