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 TM 55-1905-223-24-3
(c) Injection Timing Changes. Injection timing changes are accomplished by Advancing (1) or Retarding
(2) the cam follower action in relation to the piston position (Figure 3-26). This is accomplished by
changing the orientation of the camshaft lobe to the cam follower using different cam follower gasket
thicknesses or offset camshaft gear keys.
NOTE
Gear train timing (index mark alignment) always remains the same.
FIGURE 3-26. Cam Follower Action.
(d) Injection Timing Check. The injection timing check is a measurement which determines the injector
push rod travel in relation to the piston travel. Due to normal parts tolerances, it is necessary to check
one cylinder for each cam follower housing.
(2)
Measuring Injector Timing.
(a) Remove the rocker housing covers (paragraph 2-39).
NOTE
It is not necessary to remove all of the injectors; however, engine rotation will be easier
with all of the injectors removed.
(b) Remove the injectors from cylinders No. 1, No. 3, and No. 5. (paragraph 2-42).
NOTE
Injector timing tool can be installed without removing the rocker levers.
3-57
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