Question about 1999 Dodge Grand Caravan

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Oil pump pressure reading on gauge

What is the correct oil pressure when checking with a master gauge. Believe we need to replace oil pump.
1999 Dodge Grand Caravan LE 3.8 6cyl engine

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Any engine that cannot produce at least 15psi pressure at idle likely has a pressure loss at the crank bearings (most commonly connecting rod bearings) You can check the clearance by using plasti-gage on them once you have the pan removed.
Most times the pump is blamed for the loss of pressure but actually the pump likely has some scoring inside the housing and on the gear ends that has been caused by bearing material getting in there.
If you replace the pump alone, some pressure will be restored but that will go away quickly as more bearing material is ingested.
The pump should be replaced along with the failing bearing shells (actually best to replace all). If main bearings are worn (rare) engine will need to be removed for that service.
Always re-check bearing clearances before re assembling the engine. If any are still out of clearance, you may want to use an oversize bearing there. After checking or replacement, always re-torque anything that was removed.
Clearance specifications can be found in any good manual.

Posted on Jun 03, 2010

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The oil pressure sould be 5 psi at idle speed. And the oil pressure should be between 30 psi and 80 psi at 3000 rpm's. Hope this will help you.

Posted on Jun 03, 2010

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