SCREW 1071716 - Caterpillar

Illustration 1 g00988290
(1) End play of a new camshaft ... 0.10 0.25 mm (0.0039 0.0098 inch)Maximum permissible end play of a worn camshaft ... 0.30 mm (0.0118 inch) (2) Tighten the thrust plate bolts to the following torque. ... 10 to 13 N m (7 to 10 lb ft) (3) The diameters of the camshaft journals are given in the following table.
Table 1
Diameters of Camshaft Journals    
Camshaft Journals     Standard Diameter     Service Limit    
No. 1,2    
53.94 to 53.96 mm (2.123 to 2.124 inch)    
53.90 mm (2.122 inch)    
No. 3    
52.94 to 52.96 mm (2.084 to 2.085 inch)    
52.90 mm (2.083 inch)    
Illustration 2 g00987844
(A) Camshaft lobe liftNaturally aspirated engines Inlet lobe ... 6.722 mm (0.2646 inch) Exhaust lobe ... 6.720 mm (0.2645 inch)Turbocharged engines Inlet lobe ... 6.682 mm (0.2631 inch) Exhaust lobe ... 6.722 mm (0.2646 inch)The service limit for camshaft lobe lift is given below:Naturally aspirated engines Inlet lobe ... 6.222 mm (0.2450 inch) Exhaust lobe ... 6.220 mm (0.2449 inch)Turbocharged engines Inlet lobe ... 6.182 mm (0.2434 inch) Exhaust lobe ... 6.222 mm (0.2450 inch) (B) Camshaft lobe height (C) Base circleTo determine the lobe lift, use the procedure that follows:
Measure the camshaft lobe height (B) .
Measure the base circle (C) .
Subtract the base circle that is found in Step 2 from the camshaft lobe height that is found in Step 1. The difference is the camshaft lobe lift.If the camshaft lobe lift is less than the service limit, replace the camshaft.
Illustration 3 g01014070
(4) CamshaftDeflection over the full length of the camshaft Maximum at assembly ... 0.02 mm (0.0008 inch) Repair limit ... 0.05 mm (0.0020 inch)