knocking sound in engine - Diesel Truck Forum -
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post #1 of 5 (permalink) Old 10-12-2010, 10:07 PM Thread Starter
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knocking sound in engine

Does anyone have any advise about a knocking coming from the lower end in my 5.9 cummins. It is real noticeable when starting but quiets down when the oil pressure builds. This only recently started probably because the turbo had failed and I lost oil pressure. Do you think I could get away with pulling the oil pan and just replacing the main and rod bearings ? Thanks for any help.
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post #2 of 5 (permalink) Old 10-13-2010, 01:51 AM
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Loss of oil pressure does cause bearing failure. You will more than likely need to turn the crank as well, and that mean pulling the engine so while you have it out. You get the picture.

Start out checking everthing else, no need in pulling the engine unless it is required. How long did you run it without oil pressure?
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post #3 of 5 (permalink) Old 10-14-2010, 01:53 AM Thread Starter
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Thanks for the advise Later, It was operating off and on for about three months with low oil; pressure. The driver would notice the pressure had dropped and then add oil to bring it back up. Do you think it would work at least for a low cost solution if I pull the mains and rods and replace just the bearings? It looks like it would be a quick and easy job!
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post #4 of 5 (permalink) Old 10-14-2010, 03:42 AM
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post #5 of 5 (permalink) Old 10-14-2010, 04:16 AM
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I have never had good luck with just changing the bearings, too often some of the bearing material is stuck to the crank and needs to be cleaned off or the crank is scared by operating without proper lube. It could be just as inexpensive to get a good used engine and change it out. You can allways sell the one you have for a use able core and get about half of your money back.
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