3500B and 3500C Marine Engines Camshaft Caterpillar


Camshaft
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Illustration 1g02582277
Typical example

Table 1
Specification for 281-7849 Camshaft Gp and 281-7848 Camshaft Gp 
Item  Qty  Part  Specification Description 
Dimension of groove in a new camshaft for the thrust washer assembly is 8.75 ± 0.05 mm (0.344 ± 0.002 inch)
4N-1650 Dowel  Extension of the dowels between the camshafts is 22.0 ± 0.5 mm (0.87 ± 0.02 inch)
5B-5821 Dowel  Extension of the dowel from the camshaft assembly is 12.0 ± 0.5 mm (0.47 ± 0.02 inch)
128-5993 Thrust Washer  Thickness of a new thrust washer is 8.40 ± 0.05 mm (0.331 ± 0.002 inch)
Diameter of bearing journal 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)
16  5P-0076 Bolt  Torque to 55 ± 7 N·m (41 ± 5 lb ft)


Illustration 2g02582338

Table 2
Specification for 281-7849 Camshaft Gp and 281-7848 Camshaft Gp 
Item  Qty  Part  Specification Description 
Use the following procedure in order to determine the actual 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. 
Specified camshaft lobe lift for
Inlet lobe is 12.73 mm (0.501 inch).
Injector lobe is 13.7313 mm (0.54060 inch).
Exhaust lobe is 13.1 mm (0.52 inch)

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