2390 low oil pressure

Thad · Mar 24, 2012

Ive got a 2390 motor we just pulled out and stuck in a 970. Motor runs great but we put a guage in it and well its only got 25lbs. The light didnt come on in the 2390 so i didnt think there would be a problem. I have tried 2 oil pumps and it still drops when it gets hot down to 15 lbs. I have plastic guaged a rod and a main. They were both around .003 or so. I have air pressured the oil system thru the sender port and found no big gusher leak anywhere. I feel like a fool this thing runs so smooth no noise in the lower end. Im going to pull down all the brgs and check them. What does the oil sensor line do on the pump exactly? Everything looks so good and it was overhauled not long ago. Im missing something any ideas? Just frustrated and looking for ideas. thanks

JW · Mar 24, 2012

How many pounds does it have at rated rpm?

jon f mn · Mar 24, 2012

Did you try a different gage? It's posible the gage or sender, if it's electric, is bad.

Thad · Mar 24, 2012

I tried 2 guages and took both oil pumps apart and they look great. At 2000 rpm hot maybee 25lbs. Its just like its got a huge leak that i cant find. Im going to pull all brgs down on monday to be sure its not there. Oil pan was clean no metal or anything. Thad

D G Wells · Mar 24, 2012

The oil gauge may not be telling the truth. The line going to the gauge could be plugged with gunk and the back of the gauge full of old sludge. Try another gauge and line before going too far. I have seen it make a difference. ---Derrol in Texas---

D G Wells · Mar 24, 2012

Might need to file the base of the oil pump where it attaches to the block. Normally there is no gasket there.

Thad · Mar 24, 2012

This one has the flat ring that seals that area. I use a shim when putting the pump into place then pull it out so i dont cut the ring. Thad

casecollectorsc · Mar 24, 2012

Not familiar with oil sensor line on 2390 but sensor line from pump to oil galley on N-14 Cummins was told controls oil pressure. Had $15000 spent on N-14, and got 10 miles on it and went to 18 lbs oil pressure. Sensor line got plugged after overhaul and lowered pressure. New line and all was great!!

Brokengun · Mar 25, 2012

Thad its your Cam bearings.

If everything else checks out its your cam bearings.

Been down this road myself.

2390 low oil pressure

Thad

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JW

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jon f mn

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Thad

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D G Wells

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D G Wells

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Thad

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casecollectorsc

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Brokengun

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