RETAINER AS 3S1748 - Caterpillar

Probable Causes
Accessory Equipment
Isolate the source of the noise.Internal Engine Components
Valve train components
Pistons
Crankshaft
Gear trainRecommended Actions
Isolate the Source of the Noise
Isolate the source of the noise. Remove the suspect engine accessory. Inspect the suspect engine accessory. Repair the engine accessory and/or replace the engine accessory, if necessary.Valve Train Components
Remove the valve mechanism cover and the camshaft covers. Check the following items for damage: camshaft, valve springs, lifters, pushrods and bridges. Thoroughly clean the valve train components. Ensure that all of the valves move freely. Replace any damaged parts.During engine operation at rated speed, the valve rotation can be observed and measured.Pistons
Inspect the pistons for damage and wear. Replace any damaged parts.Crankshaft
Inspect the crankshaft and the related components. Inspect the connecting rod bearings and the bearing surfaces on the crankshaft. Make sure that the bearings are in the correct position. Look for worn thrust plates and wear on the crankshaft. Check the counterweight bolts. Replace any damaged parts.Gear Train
Inspect the condition of the gear train. Inspect the engine oil filters for nonferrous material. Replace any damaged parts.