COWLING AS 1669217 - Caterpillar

Illustration 1 g01411978 (1) Maximum permissible temperature of the camshaft gear for installation on the camshaft ... 250 °C (482 °F)
Do not use a torch to heat the gear. A torch can unevenly heat the gear causing warpage. The hardness of the gear may also be changed with the use of a torch.
(A) Diameters of camshaft journals
Table 1
Number of Journal Standard Diameter Service Limit(1)
1, 2, 3 53.94 to 53.96 mm (2.124 to 2.124 inch) 53.90 mm (2.122 inch)
4 52.94 to 52.96 mm (2.084 to 2.085 inch) 52.90 mm (2.083 inch)
(1) The service limit is the maximum dimension or the service limit is the minimum dimension that is specified for a part. Replace the part if the service limit is reached. (2) Torque for two bolts ... 12 2 N m (105 18 lb in)
Illustration 2 g01411984Use the following procedure in order to determine the camshaft lobe lift:
Measure the camshaft lobe height (C).
Measure the base circle (D).
Subtract the base circle measurement in Step 2 from the camshaft lobe height in Step 1. The difference is the actual camshaft lobe lift (B). (B) Specified camshaft lobe lift Exhaust lobe ... 7.463 mm (0.2938 inch)Inlet lobe ... 6.154 mm (0.2423 inch)Service limit for lobe lift for exhaust ... 6.963 mm (0.2741 inch)Service limit for lobe lift for inlet ... 5.654 mm (0.2226 inch)Note: Replace the camshaft if the service limit for the lobe lift is reached.
Illustration 3 g01357419Note: Use a dial indicator and blocks in order to determine the runout of the camshaft. Take one half of the dial indicator reading as the runout. (3) Maximum permissible runout for camshaft ... 0.04 mm (0.002 inch)
Illustration 4 g01357422 (4) Measure the camshaft bearing with a dial indicator. Subtract the diameter of the camshaft journal in order to give bearing clearances. Refer to Table 4 for the clearance between the camshaft journals and the bushings.
Table 2
Number of Journal Standard Diameter Repair Limit(2)
1, 2, 3 0.04 to 0.09 mm (0.002 to 0.004 inch) 0.15 mm (0.006 inch)
4 0.040 to 0.119 mm (0.0016 to 0.0047 inch) 0.15 mm (0.006 inch)
(2) The repair limit is the maximum dimension or the repair limit is the minimum dimension that is specified for a part. Repair the part if the repair limit is reached.