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 TM 55-1905-220-14-10
5-19. CAMSHAFT ASSEMBLY AND GEAR TRAIN - MAINTENANCE INSTRUCTIONS.
a. Camshaft
1.
The contrarotating camshafts are located near the top of the
cylinder block. A left cylinder bank and a right cylinder bank
camshaft is provided to actuate the exhaust valve and
injector operating -mechanism.
2.
The accurately ground cams ensure efficient, quiet, cam
follower roller action, and are heat treated to provide a hard
wear surface.
3.
The engine is equipped with a low velocity, low lift injector
cam lobe and a long closing ramp exhaust cam lobe design
camshaft. Former engines were equipped with a high lift
injector cam lobe camshaft. The two camshafts are
interchangeable and only the current camshaft, which can
be identified by the numeral "7" stamped on one end of the
camshaft, is serviced.
4.
Both ends of each camshaft 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 lock screw threaded into a counter- bored
hole in the top of the cylinder block.
5. The camshaft gear thrust load is absorbed by two thrust
washers, one on each end of the rear camshaft end bearing,
on each shaft.
5-316
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