3508B Industrial Engines Caterpillar


Camshaft

Usage:

3508B LD7


Illustration 1g03327351
(1) Left-hand camshaft assembly
(2) Right-hand camshaft assembly

Table 1
Specification for 381-1967 Camshaft Gp 
Item  Qty  Part  Specification Description 
Thickness of groove for the thrust washer in a new camshaft assembly is 8.75 ± 0.05 mm (0.344 ± 0.002 inch)
5B-5821 Dowel  Extension of the dowel is 12.0 ± 0.5 mm (0.47 ± 0.02 inch)
7N-3218 Thrust Washer  Thickness of a new thrust washer is 8.50 ± 0.05 mm (0.335 ± 0.002 inch)
Diameter of bearing journals in a new camshaft assembly is 91.88 ± 0.02 mm (3.617 ± 0.001 inch)


Illustration 2g03327356

Table 2
Item  Qty  Part  Specification Description 
Use the following procedure in order to determine the camshaft lobe lift: 
1. Measure camshaft lobe height (F).
2. Measure base circle (G).
3. Subtract the base circle (G) from the camshaft lobe height (F). The difference is the actual camshaft lobe lift.
Specified camshaft lobe lift: 
Inlet lobe is 13.250 mm (0.5217 inch).
Injector lobe is 13.731 mm (0.5406 inch).
Exhaust lobe is 13.250 mm (0.5217 inch).

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