How Do You Troubleshoot A Main Bearing Engine Noise?
Main-bearing noise is caused by worn main bearings that are oversized or loose on the crankshaft, or lack oil pressure. The main bearings can become worn from age or mileage. If diagnosed at the first occurrence and the engine is shut down shortly thereafter, new bearings can be installed and the problem solved. If oil pressure is the cause, it is possible to replace the oil pump or correct the oil-pressure problem and still save the crank. If the engine is driven for any amount of time with bearing noise, the crankshaft journals will be harmed, thus requiring a new or machined crankshaft to accomplish a repair. Check the oil dipstick and make sure that the vehicle has enough oil. Look in the valve cover, through the oil filler cap, and see if there is an inordinate amount of sludge. This won’t be necessary if you are familiar with the servicing of the vehicle since new and the oil has been changed on a regular basis. Many times the oil changes were not done on a regular basis and slud
