Low oil pressure on rebuild - Dodge Cummins Diesel Forum
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post #1 of 20 (permalink) Old 12-28-2011, 10:13 PM Thread Starter
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Low oil pressure on rebuild

Just got my rebuilt engine out of the shop it's showing low oil pressure. I bought the mechanical oil gauge and its only showing about 4-6 psi. Ive already dropped the oil pan and the pickup tube looks good. I'm starting to think its the oil bypass? Anyone have a diagram or some advice to help me troubleshoot this problem?
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post #2 of 20 (permalink) Old 12-28-2011, 10:29 PM
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Check oil filter clogged, check oil pressure regulator, oil cooler clogged? Oil suction tube or transfer tube gasket or O-ring leaking, oil pump malfunction,

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post #3 of 20 (permalink) Old 12-28-2011, 10:37 PM Thread Starter
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Brand new oil filter and brand new oil pump. Can you tell me some more about the oil pressure regulator and oil cooler? Thanks again for the help.
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post #4 of 20 (permalink) Old 12-28-2011, 10:49 PM
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Right beside the oil filter on top of the housing is a cap, take it off and it's probably spring loaded. It's set at a predetermined height to allow proper oil pressure. Make sure the plunger moves freely in the bore. The oil cooler is behind all this bolts behind the oil filter, remove the filter and remove the cooler. I guess somehow check for restrictions through the cooler, air?

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post #5 of 20 (permalink) Old 12-28-2011, 11:26 PM Thread Starter
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Pulled the cap and checked the plunger and everything seems to be moving fine. Is it just a spring and plunger under the cap or is there a check ball or something underneath?
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post #6 of 20 (permalink) Old 12-28-2011, 11:35 PM
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Just spring and plunger, it looks like oil comes straight from pan to pickup tube to the pump. A crack in the tube ? Then it goes to cooler to the regulator, and eitherbgoes back to tank if pressures to high or continues to the filter. Where's your gauge hooked up at?

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post #7 of 20 (permalink) Old 12-28-2011, 11:52 PM Thread Starter
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Oh okay and my gauge is hooked up on top of the filter right next to the turbo oil line
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post #8 of 20 (permalink) Old 12-28-2011, 11:53 PM Thread Starter
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I'm beginning to to think its the cooler but I'll have to check that out in the morning
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post #9 of 20 (permalink) Old 12-28-2011, 11:58 PM
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That would definitely be my next suggestion! Ive been looking at the lube chart as we were back and forth and I would think it's possible. If not you would have to have an internal leak returning back to the pan before the cooler? Not very possible unless your pickup tube is sucking air and not priming? Good luck

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post #10 of 20 (permalink) Old 12-29-2011, 12:37 PM Thread Starter
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Do you have a link for for the lube chart?
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post #11 of 20 (permalink) Old 12-29-2011, 12:41 PM
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You should ask Moparman1973, all I have is ISB24v service manual!

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post #12 of 20 (permalink) Old 12-29-2011, 12:59 PM Thread Starter
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wow.... i didnt know he had his own website! ill leave a thread over there and see if i can find anything out.
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