HOUSING AS-PUMP 7N4756 - Caterpillar

Illustration 1 g01277351
Checking the end play of the camshaft
Table 1
End Play
Callout Quantity Part Specification Description
1 - - End play of a new camshaft 0.10 to 0.55 mm (0.004 to 0.022 inch)
1 - - Maximum permissible end play of a worn camshaft 0.60 mm (0.023 inch)
Illustration 2 g01277354
Typical camshaft
Table 2
Camshaft Specifications
Callout Quantity Part Specification Description
2 - Bolt Tighten the bolt to the following torque. 95 N m (70 lb ft)
3 - Camshaft thrust washer Thickness of the thrust washer 5.49 to 5.54 mm (0.216 to 0.218 inch)
- - - Depth of the recess in the cylinder block for the thrust washer 5.54 to 5.64 mm (0.218 to 0.222 inch)
- - - Tolerance of the thrust washer in cylinder block front face −0.154 to −0.003 mm (−0.0006 to −0.0001 inch)
Table 3
Camshaft Journal (4)
Camshaft Journal Number Quantity Part Specification Description
1 - - Diameter of the camshaft journal 50.71 to 50.74 mm (1.9965 to 1.9975 inch)
2 - - Diameter of the camshaft journal 50.46 to 50.48 mm (1.9865 to 1.9875 inch)
3 - - Diameter of the camshaft journal 49.95 to 49.98 mm (1.9665 to 1.9675 inch)
- - - Maximum wear on the camshaft journals 0.05 mm (0.0021 inch)
Illustration 3 g03342206
Table 4
Camshaft lobe lift
Callout Quantity Type of Engine Specification Description
A - Naturally aspirated Inlet lobe 7.382 to 7.482 mm (0.2906 to 0.2946 inch)
A - Naturally aspirated Exhaust lobe 7.404 to 7.504 mm (0.2914 to 0.2954 inch)
A - Turbocharged Inlet lobe 7.031 to 7.130 mm (0.2768 to 0.2807 inch)
A - Turbocharged Exhaust lobe 7.963 to 8.063 mm (0.3135 to 0.3174 inch) (B) Camshaft lobe height (C) Base circle To 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 actual camshaft lobe lift. Maximum permissible clearance between the actual lobe lift and the specified lobe lift of a new camshaft ... 0.05 mm (0.021 inch)