Re: Trim NIGHTMARE for 150HP Mercury Black Max
Clayjunky, 2 things about this type of trim pump control valve...the piece you are speaking of is a Plunger Solenoid...this solenoid receives Positive battery voltage when the ignition key is turn to the On position...this solenoid controls Down cycle hydraulic pressure....it is basically a pressure relief valve, if there is TOO much Down pressure, it will "pop" out and release the Down pressure....look at it like this, if you are raising the engine there is not too much that can go wrong, but if you are trimming the engine In, this creates a "crush" zone...so the solenoid plunger will kill Down pressure if it gets enough resistance...NOW, it can affect the Up pressure cycle too...BUT the manual release mechanism (it is to the right of that solenoid plunger) it has a little "tee" handle on it...that release mechanism must be turned clock-wise very tight...if it is not real tight, THAT will let the Up pressure bleed off...problems with the manual release mechanism is most likely the problem...i use a Mercury test gauge set to rebuild these pumps, it determines if the problem is in the release mechanism, or if it is a pump cavitation problem...gotta have a test gauge set to be able to determine the true cause of the Up pressure bleed-off...