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engine noise ? 390 diesel

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case310350

01-04-2015 10:36:27




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what is the best way to determine if a bearing is going on a diesel engine. I here a faint knock but engine is noisy. so is it wrist pin, piston slap, rod bearing. Less noise at higher rpm. if I open a injector and it is a rod bearing it should become much louder??? would replacing the bearings extend the time before rebuild.




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steven meckstroth

01-04-2015 12:28:04




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 Re: engine noise ? 390 diesel in reply to case310350, 01-04-2015 10:36:27  
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If you have a mechanics stethoscope, you can listen to the block at the main bearing locations. If you don't have a stethoscope, a long handle screwdriver will work. Put the blade of the screwdriver against the block and your ear on the other end. If you have a rod bearing going bad, you will likely hear a ticking noise at the main bearing locations on both sides of the bad rod. The sound level on both sides should be the same.

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