Question about Jeep Grand Cherokee

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After starting vehicle, oil pressure will start to drop after running for about a minute and motor will start knocking.

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When you first start your engine the oil is cold and somewhat thicker, therefore oil pressure is a bit higher. If your bearings are worn, as the oil gets warmer and thins out, they will begin to knock. If you don't drive it and have caught the condition early, sometimes you can just replace the rod bearings, and it will be OK. However, after removing the oil pan and inspecting the damage, if you find that the main bearings are also worn, the engine will need to be removed and all bearings must be changed.(use "plastigage" to determine bearing wear) I strongly recommend that you change the oil pump as well, to ensure that new parts get a good oil supply. NOTE: some people attempt to just replace the oil pump when this condition exists...It is a total waste of time, and will not work. I know that this is not what you wanted to hear, but its a fact!

Posted on Apr 15, 2009

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