Oil Pressure

NISSAN PATHFINDER

PRICEMR

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I have a 1987 Nissan Pathfinder, 4X4, vg30 engine, automatic trans. The motors were swaped with another vg30 engine with 94000 miles. After driving it for 2 days the oil pressure drops to 10 after it warms up. It has a new oil pressure sending unit, and just had a new oil pump put in it at the shop and still doing the same thing, oil pressure dropping off. I was wondering what else could cause this, The head gasket was changed, heads milled, and new timing belt pror to the engine change.

Aug 13, 2007 at 5:44 AM

RASMATAZ

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[quote:4fa5474a69="pricemr"]I have a 1987 Nissan Pathfinder, 4X4, vg30 engine, automatic trans. The motors were swaped with another vg30 engine with 94000 miles. After driving it for 2 days the oil pressure drops to 10 after it warms up. It has a new oil pressure sending unit, and just had a new oil pump put in it at the shop and still doing the same thing, oil pressure dropping off. I was wondering what else could cause this, The head gasket was changed, heads milled, and new timing belt pror to the engine change.[/quote:4fa5474a69]

The only way to tell is to hook-up an oil pressure gauge and read off. Remember oil pressure increases when engine rpm increases.

@ 2K rpm it should read atleast 40lbs or better.

Did they prime the pump?

If its not the pump or sending unit its coming from bad engine bearings rod/crank

Aug 13, 2007 at 6:23 AM