Posted by John in La on May 26, 2013 at 16:08:50 from (184.38.192.146):
Trying to help out a friend but may have gotten in over my head. 10/97 build date F150 4.2 Motor hydro locked. Friend bought a rebuilt long block from a national rebuilder and installed in truck. Died in a car accident before he could finish it so I told widow I would try and get it running.
Got it all buttoned up. Ran good with no noise but had no oil pressure. Thought it was the sending unit so I put a mechanical gauge on it. 0 pressure at idle and 20 lbs. when revved up per mechanical gauge.
Thinking it might be sucking air I pulled the motor back out to check pickup tube. Looks good. Pumps plenty of oil when run with a drill as oil streams from the area of each piston. Put oil pan back on and removed gauge. Oil shoots out the fitting where the sending unit/ gauge installs about 2 or 3 ft. Put gauge back on and run with a drill and get no pressure reading.
This has me stumped. Only other thing I can think of is pressure relief valve is stuck open. Do not know if he installed the new one that would have come with the new oil pump.
Any ideas??????????? Any one know where you can get that little freeze plug that holds pressure relief valve in without buying a new oil pump?????
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