03 Ram 5.9 HO knocking noise - Dodge Cummins Diesel Forum
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Old 05-17-2011, 09:24 PM   #1 (permalink)
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Smile 03 Ram 5.9 HO knocking noise

I recently bought this 03 Quad cab dually with a 5.9 HO engine. It had 206,000kms on it & I know nothing about it's past. When I first went to look at it according to the owner it had sat a few months. I had to boost it to start it. It then started right up but I noticed a knocking sound on top of the engine. I previously had a a 96 12 valve so I was unsure how the common rail was to sound. I took it for a drive & everything appeared fine. I bought it & drove it home 500kms. Truck ran fine. Changed the oil when I got it home & can say the knocking isn't always there. It is heard at idle & not too sure if it goes up with rpms. It's been 2 months now & it still knocks. What I am concerned with now is the noise. A guy came by this weekend & bought a tonneau cover off me. He showed up in the same truck, same year. No knock. His had 266,000kms & nothing down to his. I don't know if this is valve related or an injector knock. This week I could feel a slight vibration, like a miss in the pedal that wasn't there before. The tach seems steady & no obvious signs of anything. Mileage is roughly 20 Canadian miles per gallon checked with the odometer not the lie-o-meter. Any ideas?
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Old 05-17-2011, 09:39 PM   #2 (permalink)
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You could block off each injector individually, to try and isolate to a specific cylinder. Worse case scenario in my mind would be a dropped exhaust valve seat... pull the valve cover and look to see if the rockers are all evenly aligned as far as height when exhaust valves are closed.

Injector block off tool is about $20.

Read this:Got my valves adjusted today...
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Last edited by jjpage; 05-17-2011 at 09:51 PM.
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Old 05-17-2011, 10:13 PM   #3 (permalink)
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Thanks I think I'll pull the valve cover off on the weekend.
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Old 05-20-2011, 11:01 PM   #4 (permalink)
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Well I got it done today. I took it in to a truck mechanic who was refereed as the best with Cummins engines around here. Well he was. Truck runs MUCH better now. No knock. He said that the #6 was worst. Looked as if it was not adjusted since new. Lots of response from the pedal now.
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