C4.4 Engines for Caterpillar Built Machines Caterpillar

Crankshaft Pulley - Check

Usage:

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Table 1
Limits for Crankshaft Pulley Runout and Alignment (Total Indicator Reading)
-	Maximum Limit (Total Indicator Reading)
Runout	0.12 mm (0.005 inch)
Alignment	0.18 mm (0.007 inch)

The crankshaft pulley is installed on the front of the crankshaft.

Replace the crankshaft pulley if any of the following conditions exist:

There is movement of the crankshaft pulley.
There is a large amount of gear train wear that is not caused by lack of oil.
Analysis of the engine oil has revealed that the front main bearing is badly worn.
The engine has had a failure because of a broken crankshaft.

Check the areas around the holes for the bolts in the crankshaft pulley for cracks or for wear and for damage.

Use the following steps in order to check the alignment and the runout of the crankshaft pulley:

Remove any debris from the front face of the crankshaft pulley. Remove any debris from the circumference of the crankshaft pulley.

Mount the dial indicator on the front cover. Use the dial indicator to measure the outer face of the crankshaft pulley. Set the dial indicator to read 0.00 mm (0.00 inch).

The difference between the lower measurements and the higher measurements that are read on the dial indicator at all four points must not be more than the limit that is given in table 1.
If the reading on the dial indicator is more than the limit that is given in table 1, inspect the pulley for damage. If the pulley is damaged, use new parts for replacement.

Move the dial indicator so that the dial indicator will measure the circumference of the crankshaft pulley. Set the dial indicator to read 0.00 mm (0.00 inch).

Slowly rotate the crankshaft in order to measure the runout of the circumference of the crankshaft pulley. Use the highest reading and the lowest reading on the dial indicator. The maximum and the minimum readings on the dial indicator should not vary more than the limit that is given in table 1.
If the reading on the dial indicator is more than the limit that is given in table 1, inspect the pulley for damage. If the pulley is damaged, use new parts for replacement.