C7 Engines for Caterpillar Built Machines Caterpillar


Camshaft

Usage:

12M B92


Illustration 1g02529376
(2) Inlet lobe
(3) Exhaust lobe

Table 1
Specification for
212-4285 Camshaft Gp 
Item  Qty  Part  Specification Description 
107-7694 Thrust Plate  Thickness is 4.70 mm (0.185 inch)
212-4284 Camshaft As  End play of a new camshaft is 0.13 ± 0.08 mm (0.005 ± 0.003 inch)
Maximum permissible end play of a worn camshaft is 0.45 mm (0.018 inch).
Diameter of the new camshaft journal is 65.126 ± 0.013 mm (2.5640 ± 0.0005 inch).
Total distance between the shoulder of the camshaft and the shoulder of the gear is 4.83 ± 0.05 mm (0.190 ± 0.002 inch)
Specified camshaft lobe lift :
1. For exhaust lobe is 7.707 mm (0.3034 inch).
2. For Inlet lobe is 7.970 mm (0.3138 inch)
Use the following procedure to find the actual lobe lift:
1.Measure the camshaft lobe height (D).
2. Measure the base circle (E).
3. Subtract the base circle measurement in step 2 from the camshaft lobe height in step 1. The difference is the actual lobe lift.
The maximum permissible difference between the actual lobe lift in step 3 and the specified camshaft lobe lift of a new camshaft is ± 0.10 mm (0.004 inch).

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