TM 9-2320-280-34
This task covers:
a. Removal
c. Installation
b. Inspection
INITIAL SETUP:
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Manual_R_fe____es
General mechanic's tool kit:
TM 9-2815-237-34P
automotive (Appendix G, Item 1)
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Mat__ials/____s
Torsional damper removed (para. 3-7).
Gasket (Appendix E, Item 9)
Water pump and adapter plate removed
Three special keys (Appendix E, Item 45)
(para. 5-4).
Sealing compound
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(Appendix B, Item 45)
Direct support
Lubricating oil (Appendix B, Item 31)
a. Removal
NOTE
When measuring timing chain deflection, slack should be
removed from one side before measurement is taken on opposite
side.
In some cases, flanged head fasteners may be present instead
of standard fasteners and washers. In all cases, washers should
be used when replacing a flanged head fastener with a standard
fastener.
Perform step 1 for M997, M997A1, and M997A2 ambulance
vehicles only.
1.
Remove nut (5) and screw (7) from timing chain cover (6).
2.
Remove three capscrews (1) and driven gear (2) from injection pump (9).
3.
Remove two capscrews (18), nut (3), and baffle (4) from timing chain cover (6).
4.
Remove three nuts (11) and washers (10) from injection pump (9) and timing chain cover (6).
5.
Remove four capscrews (13) from timing chain cover (6) and oil pan (14).
6.
Remove five capscrews (16), four washers (15), timing chain cover (6), and gasket (8) from cylinder
block (12). Discard gasket (8).
7.
Using dial indicator, check timing chain (23) deflection midway between camshaft sprocket (22) and
crankshaft sprocket (29). Total deflection must not exceed 0.810 in. (20.6 mm). If deflection exceeds
specification, timing chain (23) must be replaced.
8.
Using dial indicator, check camshaft end play. Camshaft end play must not be more than 0.012 in.
(0.3 mm). If end play exceeds specification, camshaft sprocket (22) and thrust plate (26) must be
inspected for wear after removal.
9.
Remove capscrew (19), washer (20), pump drive gear (21), and camshaft sprocket (22) from
camshaft (24).
10.
Remove crankshaft sprocket (29), camshaft sprocket (22), and timing chain (23) as an assembly.
NOTE
Cover oil pan opening to prevent special keys from falling into oil
pan.
11.
Remove two special keys (27) from crankshaft (28) and special key (25) from camshaft (24). Discard
special keys (27) and (25).
Change 2
