Quote:
Originally Posted by Brian Lesemann
I have a friend who just replaced a rod bearing on his 300SD. The motor starts fine and has good pressure, but as it warms up a knocking sound increases and pressure drops. We suspect the main bearing might be going bad. Does anyone know any other causes for this?
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My first thought is did your friend find out and fix what caused the rod bearing to go bad in the 1st place? Next is why the main bearings were not inspected while the crankcase was open? Last thought what was the condition of the crank journal and the inside diameter of the Connecting rod when the new bearings were installed?