'86 Johnson GT150 Tilt/Trim problem

[mak747]

I have a 1986 Johnson GT150 model J150STLCDC which the tilt and trim quit working on. The electric motor works but the unit will will not raise or lower the motor. The problem started with the tilt no working but the trim working fine but has now progressed to where neither work. I tried filling the reservoir with fluid and cycling the unit to bleed the system but to no avail. I removed the tilt/trim unit from the motor to try and diagnose the problem. I drained the fluid from the reservoir and found it to be very milky indicating water intrusion. I removed the electric motor and found a milky sludge blocking the screen filter for the units oil pump. I cleaned the screen and removed the oil pump to flush it out. My question is can the oil pump be tested individually to see if it is defective? The manual states that ATF fluid was an acceptable alternative to the OMC power tilt/trim fluid. I tried submerging the oil pump in ATF and then turning the pump with a drill motor but see no fluid being drawn in or expelled from the pump, is this a valid test? If not is there a way to test the pump? Thanks in advance for any advice.

[ChampioNman]

There are a myriad of check valves in the unit, being that old and with water intrusion a complete rebuild is probably in order. Or look for a good used assembly.

[316jughead]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by ChampioNman &raquo;</td></tr><tr><td class="quote"> There are a myriad of check valves in the unit, being that old and with water intrusion a complete rebuild is probably in order. Or look for a good used assembly.</td></tr></table>

[mak747]

Thanks for the quick reply. I have checked Ebay and found a few units that should work for around $250 which is cheaper than just a new oil pump. I am probably going to go that route but was just trying to test the oil pump before making a final decission. Do you know if this would be a valid test as to whether the pump is opperational or not? "I tried submerging the oil pump in ATF and then turning the pump with a drill motor but see no fluid being drawn in or expelled from the pump, is this a valid test?" Thanks

[ChampioNman]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by mak747 &raquo;</td></tr><tr><td class="quote">Thanks for the quick reply. I have checked Ebay and found a few units that should work for around $250 which is cheaper than just a new oil pump. I am probably going to go that route but was just trying to test the oil pump before making a final decission. Do you know if this would be a valid test as to whether the pump is opperational or not? "I tried submerging the oil pump in ATF and then turning the pump with a drill motor but see no fluid being drawn in or expelled from the pump, is this a valid test?" Thanks</td></tr></table>

NO the unit must be sealed, and ready for testing.

[mak747]

ChampioNman, thanks for the advice. I have located a used unit and it is on the way to me.