ENGINE AR 1G4086 - Caterpillar

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Illustration 1 g03113696
(1) Left-hand camshaft assembly
(2) Right-hand camshaft assembly
Table 1
Specification for 231-9123 Camshaft Gp
Item Qty Part Specification Description
A - - Thickness of the groove in a new camshaft assembly for the thrust washer is 8.75 0.05 mm (0.344 0.002 inch).
C 2 5B-5821 Dowel Extension of the dowel is 12.0 0.5 mm (0.47 0.02 inch).
D 2 7N-3218 Thrust Washer Thickness of a new thrust washer is 8.50 0.05 mm (0.335 0.002 inch).
E - - Diameter of bearing journals for a new camshaft is 91.88 0.02 mm (3.617 0.001 inch).
Bore in camshaft bearing after installation is 92.00 0.06 mm (3.622 0.002 inch).
- - - End play for a new camshaft assembly is 0.15 to 0.35 mm (0.006 to 0.014 inch).
3 16 5P-0076 Bolt Torque to 55 7 N m (41 5 lb ft).
F 2 4N-1650 Dowel Extension of the dowel is 22.0 0.5 mm (0.87 0.02 inch).
Illustration 2 g03113697
Table 2
Item Qty Part Specification Description
- - - Use the following procedure in order to determine the camshaft lobe lift:
1. Measure camshaft lobe height (H).
2. Measure base circle (J).
3. Subtract the base circle (J) from the camshaft lobe height (H). The difference is the actual camshaft lobe lift.
G - - Specified camshaft lobe lift:
Inlet lobe is 12.73 mm (0.501 inch).
Exhaust lobe is 13.10 mm (0.516 inch).
Injector lobe is 13.73 mm (0.541 inch).