3044C Industrial Engine and Engines for Caterpillar Built Machines Gear Group - Inspect Caterpillar

Inspect the Gear Group

Illustration 1	g00987777
Exploded view of the front timing group (1) Camshaft gear (2) Upper idler gear (3) Oil pump gear (4) Crankshaft gear (5) Fuel injection pump gear

Inspect the gears for wear or for damage. If the gears are worn or damaged, use new parts for replacement.

Note: If one or more of the gears need to be removed for repair, refer to Disassembly and Assembly in order to properly remove the gears.

Measure Backlash and End Play

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Illustration 2	g00987788
Measuring backlash

1. Install the dial indicator in Illustration 2, as shown.

2. Measure the backlash of the gears. Refer to Specifications, "Gear Group (Front)" for the values of the backlash.

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Illustration 3	g00987800
Measuring end play of the idler gear

1. Install the dial indicator in Illustration 3, as shown.

2. Measure the end play of the idler gear. Refer to Specifications, "Gear Group (Front)" for the values of the end play.

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Illustration 4	g00996060
Measuring end play of the camshaft

1. Install the dial indicator in Illustration 4, as shown.

2. Measure the end play of the camshaft. Refer to Specifications, "Camshaft" for the values of the end play.

   Note: The end play is controlled by the camshaft thrust washer. If the end play is not within specifications, replace the thrust washer.