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 TM 55-1905-220-14-10
5-19. CAMSHAFT ASSEMBLY AND GEAR TRAIN - MAINTENANCE INSTRUCTIONS.
3. Each camshaft gear on the right hand rotation
engines are keyed to the shaft and held securely by a
nut, nut retainer, retainer bolts and lockwashers.
4. Camshaft gears used on 12V engines are not
interchangeable.
c. Idler gear
1.
The idler gear is mounted on a double row, tapered
roller bearing, which in turn is supported on a
stationary hub. This hub is secured directly to the
cylinder block by a bolt which passes through the
hub and rear end plate. A dowel in the hub correctly
positions the hub and prevents it
from rotating.
2.
The idler gear bearing consists of two cups, two
cones and an outer and inner spacer ring. 3. The
idler gear bearing cup(s) is a light press fit in the
gear and is held in place by a retainer which is
secured by six bolts. The bearing cones are
pressed onto the gear hub and do not rotate. The
spacer(s) separates the bearing cones.
4. The idler gear is pressure lubricated by oil from the
cylinder block rear cross oil gallery. Oil enters an
opening between the cylinder block and the idler
gear hub and circulates around the idler gear hub
bolt which has a smaller outside diameter than the
inside diameter of the gear hub bolt hole. The oil is
forced through a drilled passage in the gear hub to
the roller bearing.
5-318
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