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TM 55-1905-221-14-3
a. Camshaft.
The camshaft and the balance shaft are located near the top of the cylinder block and each may be located
on either side of the engine depending upon engine rotation. The camshaft actuates the valve and injector
operating mechanism.
The accurately ground cams on the camshaft ensure efficient, quiet, cam follower roller action, and are
heat treated to provide a hard wear surface.
Both ends of the cam and balance shaft are supported by a bearing assembly which consists of a flanged
housing and two bushings. In addition, intermediate two-piece bearings support the camshafts at uniform
intervals throughout their length. The intermediate bearings are secured to the camshaft by lock rings,
thus permitting them to be inserted in the cylinder block with the shafts. Each intermediate bearing is
secured in place, after the camshafts are installed, with a lockscrew threaded into a counterbored hole in
the top of the cylinder block.
On both the cam and balance shafts the gear thrust load is absorbed by two thrust washers one on each
end of the rear end shaft bearings of "D" basic engines and at the front of the "B" engines. The thrust
washers bear against thrust shoulders.


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