TM 10-4320-344-24
b .
Using dry, filtered, compressed air blow out lubricating passages on two
rocker arm shafts (Figure 3-36,
1) and twelve rocker arms (4).
c .
Inspect two rocker arm shafts (1) for cracks, burrs, dents, distortion, wear,
scoring,
or shoulders and ridges due to action of rocker arms (4).
Inspect
each rocker arm shaft (1) for the following dimensions:
Table 3-2.
Rocker Arm Shaft Dimensions, Model 609-A.
Shaft
Minimum
Maximum
Length
13.699 (347.95 mm)
13.739 (348.97 mm)
Diameter
0.8560 (21.7424 mm)
0.8600 (21.8440 mm)
d.
Inspect center shaft support (2), center spacer (3), twelve rocker arms (4),
22 spacers (6), and six shaft supports (7) for cracks, burrs, or damage.
Adjusting screws are self-locking and take a minimum of 3 ft-lbs (4 N•m) of
torque to turn into rocker arms.
e .
Check for damaged threads on all adjusting screws (10) and rocker arms (4).
f .
Inspect each rocker arm (4) for worn shaft bore diameter.
Minimum/maximum
bore diameter: 0.8625/0.8665 in. (21.9075/22.0091 mm).
g .
Inspect six spacer springs (5) for damaged ends and misaligned coils.
Using a
10 lb load, test compression of each spacer spring (5).
Each spacer spring
(5) should compress with load to 1 inch.
h.
Replace all damaged, defective or worn components.
3.8.17.4 Assembly.
a.
Lightly coat rocker arm shaft (Figure 3-37, 1) with clean engine oil.
b .
Install plug (7) and retaining ring (8) on end of each rocker arm shaft (1).
To avoid improper lubrication, refer to tags and install parts on rocker arm
shaft in same order as removed.
c .
Slide following parts on each rocker arm shaft (1):
• 3 shaft supports (2)
• 11 spacers (3)
• 3 shaft springs (4)
• 6 rocker arms (5)
• 1 center spacer (6)
Remove and discard tags from all components after installation.
d .
Ensure that spacers (3) are installed on rocker arm shaft (1) as indicated in
Figure 3-37.
(Quantities are in parenthesis under callout.)
e .
Carefully install two rocker arms shafts (1) in center shaft support (9).
3-85
NOTE
