I'm looking for a way of testing a merc trim pump to see if it is holding pressure correctly... I spent most of last season replacing the seals in the trim ram
(offshore type) which seemed to stop the engine trimming in under load/ when parked up on the trailer overnight temporarily (for a couple of weeks) but I'm starting to think this was just a coincidence...? There is no pitting on the trim ram/ internal wall of the cylinder and none of the seals have had any visible damage before replacement. The oil in the cylinder is also free of water/air when I drain it down.
So....... is there any way of testing the trim pump to see if it is holding pressure? It is one of the old versions with the steel reservoir.