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 TM 55-1905-223-24-5
(a) Tighten to 180 in-lb torque.
(b) Tighten to 35 ft-lb torque.
d.
Check the injection timing:
(1)
Injection Timing Code. The injection timing code appears on the engine data plate.
Codes are alphabetic letters that relate to a numerical specification.
(2)
Advanced and Retarded Timing. Advanced timing (1, FIGURE 3-30) means the fuel is
injected earlier into the cylinder during the compression stroke. Retarded timing (2)
means the fuel injection occurs closer to top dead center (TDC) in the cylinder.
FIGURE 3,-35. Advanced and Retarded Timing .
(3)
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-
36). 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.
(4)
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.
3-52
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