ALTERNATOR GP-CHARGING 1178046 - Caterpillar

Side Clearance of Camshaft
Illustration 1 g02809459
Set a dial indicator with its point on the camshaft.
Move the cam gear to the front and rear to measure the side clearance.
Table 1
Side clearance of camshaft Factory specification 0.070 to 0.22 mm (0.0028 to 0.0086 inch)
Allowable limit 0.30 mm (0.012 inch) Camshaft Alignment
Illustration 2 g02914358
Hold the two end journals of camshaft with V blocks on the surface plate.
Set a dial indicator with its point on the middle journal.
Turn the camshaft slowly and read the variation on the indicator. (Half of the measurement)
Table 2
Camshaft alignment Allowable limit 0.01 mm (0.0004 inch)
If the measurement is more than the allowable limit, replace the camshaft. Camshaft Height
Illustration 3 g02914359
Measure the height of the cam at its highest point with an external micrometer.
Table 3
Camshaft height Factory specification Intake Valve 37.63 mm (1.481 inch)
Exhaust Valve 38.96 mm (1.534 inch)
Allowable limit Intake Valve 37.13 mm (1.462 inch)
Exhaust Valve 38.46 mm (1.514 inch)
If the measurement is less than the allowable limit, replace the camshaft. Oil Clearance of Camshaft Journal
Illustration 4 g02914360
Measure the camshaft journal outside diameter with an external micrometer.
Illustration 5 g02914361
Measure the cylinder block bore inside diameter for the camshaft with a cylinder gauge.
Calculate the oil clearance.
Table 4
Oil clearance of camshaft journal Factory specification 0.050 to 0.091 mm (0.0020 to 0.0035 inch)
Allowable limit 0.15 mm (0.0059 inch)
Table 5
Camshaft journal outside diameter Factory specification 45.934 to 45.950 mm (1.8085 to 1.8090 inch)
Camshaft bearing bore inside diameter Factory specification 46.000 to 46.025 mm (1.8111 to 1.8120 inch)