1985 Ford F350 No oil pressure

TERLUX

MEMBER
1985 FORD F-350
V8
2WD
AUTOMATIC
48,000 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.

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

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.

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Monday, June 14th, 2010 AT 10:53 PM

TERLUX

MEMBER
2 POSTS

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.

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Monday, June 14th, 2010 AT 11:11 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

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?

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Monday, June 14th, 2010 AT 11:39 PM