engine noise ? 390 diesel

case310350

New User
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.
 
(quoted from post at 11:36:27 01/04/15) 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.

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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