3-72. INJECTION TIMING (Contd)
b. Injection Timing Cylinder No.
Injection timing for No. 1 cylinder requires that No. 1 piston be set at TDC. TDC will occur
during both compression stroke and exhaust stroke. Injection timing is performed when
piston is at TDC on compression stroke.
Adjustments to injection timing are made by altering thickness of cam follower assembly
Injection timing may be advanced or retarded by adding or removing cam follower
Use cylinder Nos. 1, 3, and 5 to check injection timing.
Dial indicators used in injection timing must have a total travel of at least 0.25 in. (6.350
Ensure camshaft is pushed in every time crankshaft is rotated.
Use only the crankshaft to rotate engine. The use of gears will result in false
measurements. Gear lash must be closed up in the direction of normal rotation
(crankshaft rotating clockwise when facing crankshaft front pulley).
Two screws (18)
Install on threaded holes on front
The two screws (18) will be used
of crankshaft (17). See view A.
for turning crankshaft (17) to
locate TDC (19).
Rotate clockwise to TDC (19)
TDC can be determined when
on compression stroke, using a
both rods (9) and (11) start
suitable bar between two screws
moving upward. Continue
(18). Refer to view B.
rotating until piston follower rod
(11) reaches its uppermost travel
position. When TDC (19) is
determined, remove two screws
(18) and install on locations shown
in view A.
Piston dial indicator (16)
Adjust as follows:
and pushrod dial indicator
a. Move both downward until
seated on piston follower rod (11)
in their fully compressed position.
b. Raise both approximately
0.02 in. (0.508 mm).
c. Lock in place with piston dial
indicator setscrew (1) and push-
rod dial indicator setscrew (4).