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 TM 55-1905-223-24-5
CAUTION
The oil grooves on the thrust bearing must be toward the camshaft gear to
prevent bearing failure.
b. Install the thrust bearing (4) on the camshaft (3).
c. Install four camshaft pilots (1) over the outer base circle of the valve lobes between the camshaft
journals (FIGURE 3-69).
d. Use a rubber band (3) to hold the installation pilots (1) in place. The rubber band (3) must straddle the
valve lobes.
e. Apply a film of Lubriplate 105 or its equivalent to the camshaft journals and the camshaft bushings.
f. Rotate the camshaft slowly as it is being installed in the cylinder block.
g. Align the "O" mark on the camshaft gear with the "O" mark on the crankshaft gear (FIGURE 3-70).
h. After aligning the "O" marks, push the camshaft in the bore until the thrust bearing fits against the
cylinder block.
CAUTION
Do not allow the rubber bands to fall into the crankshaft cavity of the cylinder
block when removing the installation pilots.
i. Remove the camshaft installation pilots (1, FIGURE 3-69).
j. Use a dial indicator to check the backlash between the camshaft gear (1, FIGURE 3-71) and the
crankshaft gear (2).
(1) Put the tip of the dial indicator (1, FIGURE 3-72) against a tooth on the camshaft gear (2).
(2) Turn the camshaft gear by hand as far as it will freely move, and set the dial indicator at "O" (zero).
(3) Turn the camshaft gear (2) by hand in the opposite direction as far as it will freely move, and read
the dial indicator (1). Backlash between the camshaft and the crankshaft gears should be minimum
0.002 inch (0.05 mm); the maximum should be 0.02 inch (0.50 mm).
k. Install the gear cover and PTO housing assembly (paragraph 3-20).
l. Lubricate the valve and the injector lobes with engine lubricating oil, and install the cam follower
assemblies (paragraph 3-18).
m. Install the accessory drive pulley (paragraph 3-19).
3-111
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