SEAL 7B2174 - Caterpillar

Illustration 1 g03099021
(1) Left-hand camshaft assembly
(2) Right-hand camshaft assembly
Table 1
Specification for 7W-1256 Camshaft Gp
Item Qty Part Specification Description
A - - Thickness of the groove in a new camshaft assembly is 8.75 0.05 mm (0.344 0.002 inch).
B 2 7N-3218 Thrust Washer Thickness of a new thrust washer is 8.50 0.05 mm (0.335 0.002 inch).
C - - Diameter of bearing journals in a new camshaft assembly is 85.88 0.02 mm (3.381 0.001 inch).
Bore in camshaft bearing after installation is 86.00 0.06 mm (3.386 0.002 inch).
- - - End play for a new camshaft assembly is 0.15 to 0.35 mm (0.006 to 0.014 inch).
Illustration 2 g03099022
Table 2
Specification for 7W-1256 Camshaft Gp
Item Qty Part Specification Description
- - - Use the following procedure in order to determine the camshaft lobe lift:
1. Measure camshaft lobe height (E).
2. Measure base circle (F).
3. Subtract the base circle (F) from the camshaft lobe height (E). The difference is the actual camshaft lobe lift.
D - - Specified camshaft lobe lift:
Inlet lobe is 9.314 mm (0.3667 inch).
Injector lobe is 13.731 mm (0.5406 inch).
Exhaust lobe is 9.078 mm (0.3574 inch).