400 oil pressure problem
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Joined: Feb 2003
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400 oil pressure problem
I have a somewhat recent rebuilt 400 that is just now starting to worry me with varrying oil pressures. When idling, it will drop down to no pressure. I know it will drop some, but it doesn't even register on the pressure guage. The oil level is correct, that was the first thing I checked. It comes up to normal when I accelerate. The engine doesn't sound or run any different than usual. I doubt it is the guage since it still varies from high to low and stays fairly regular when driving down the road at a constant speed.
What do you guys think I should do, check the sensor or just swap the oil pump? I'm wanting to swap the oil pump just to be on the safe side.
What do you guys think I should do, check the sensor or just swap the oil pump? I'm wanting to swap the oil pump just to be on the safe side.
Elder User
Joined: Jun 2003
Posts: 886
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From: Houston/Hope BC
400 oil pressure problem
I would start by installing a mechanical guage to verify the problem. (I run the stock and a mechanical and notice very little correlation between the two.)
If you do have to go back into the engine for the oil pump, check clearance on your rod bearings.
If you do have to go back into the engine for the oil pump, check clearance on your rod bearings.
Senior User
Joined: Jul 2002
Posts: 145
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400 oil pressure problem
Its a 351M/400 Block. These blocks were characterized by many things, one of which being an oil pressure issue. These engines are tough hogs and a drop in OP every once in a while shouldnt be alarming if no noise is present, just check the oil often and I agree with installing a mechanincal guage
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