ALTERNATOR GP-CHARGING 3400707 - Caterpillar

Probable Causes
Accessory equipment
Valve train components
Pistons
Crankshaft
Gear trainRecommended Actions
Accessory Equipment
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. Check the following items for damage: camshaft, valve rotocoil, valve springs, camshaft followers, rocker shaft, bridges and injectors. Thoroughly clean the valve train components. If the camshaft is being replaced, also replace the valve lifters. Ensure that all of the valves move freely. Replace any damaged parts.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. Replace any damaged parts.Inspect the flywheel and the flywheel bolts. Inspect the engine oil filters for nonferrous material. Flaking of nonferrous material could indicate worn gear train bearings.