Mechanics

F350 NO OIL PRESSURE

1985 Ford F-350

Engine Mechanical problem
1985 Ford F350 V8 Two Wheel Drive Automatic 48000 miles

I recently purchased a 1985 Ford motorhome. It sat in the persons yard for approximately 3 years. It has a 460 motor. I got it home it ran okay on the way home and had oil pressure, I cleaned it up and changed the oil. Now I have no oil pressure. I have changed the oil pump and checked the sending unit. Someone said that in changing the oil I have to prime the oil system, can this be? If so how do I do this reprime? If not true do you have any suggestions on what might have happened when I changed the oil to cause no oil pressure.
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Terlux
June 14, 2010.



Are you positive you have the right filter? Is the drive rod between the distributor and oil pump installed and working? I have never seen one drop oil pressure from changing it, as far as losing prime goes.

Tiny
Jack42
Jun 14, 2010.
I put a drill on the drive rod and still no pressure. I dont know about the oil filter. Don't understand why know pressure after changing the oil. Any other suggestions.

Tiny
Terlux
Jun 14, 2010.
Like I said, I have never seen one drop pressure from an oil change, check the filter. If it is the wrong one it can cause a no oil pressure situation. Sounds as if that is the only thing you havent changed back out since the oil change. Did you prime the new oil pump before you installed it?

Tiny
Jack42
Jun 14, 2010.