PLATE 3450331 - Caterpillar

Illustration 1 g00950089The crankshaft vibration damper is located at the rear end of the engine compartment.Damage to the vibration damper or failure of the vibration damper will increase torsional vibrations. These vibrations will result in damage to the crankshaft and to the other engine components. A deteriorating vibration damper will cause excessive gear train noise at variable points in the speed range.Caterpillar recommends replacing the vibration damper for any of the following reasons:
The engine has had a failure because of a broken crankshaft.
The S O S oil analysis detected a worn crankshaft front bearing.
The S O S oil analysis detected a large amount of gear train wear that is not caused by a lack of oil.
The alignment marks on the hub and on the outer ring are not in alignment because the rubber seal has separated.The vibration damper can be used again if none of the above conditions are found and the damper is not damaged.Note: Some wobble on the outer ring of the vibration damper is normal.Reference: Refer to Disassembly and Assembly, SENR1013, "3408E & 3412E Engines For Caterpillar Built Machines" for more information.