TM-9-2320-280-20-2

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 2 OF 3

JANUARY 1996
TM-9-2320-280-20-2

  TM-9-2320-280-20-2 - Page 124 of 951

3-56. LEFT EXHAUST MANIFOLD REPLACEMENT
This task covers:
a. Removal
b. Installation
WARNING
Do not touch hot exhaust system components with bare hands.
Severe injury will result.
1.
Remove three locknuts (8), washers (9), capscrews (11), and washers (9) from crossover pipe (7) and
exhaust manifold (4). Discard locknuts (8).
NOTE
Some vehicles may have a socket-head screw in place of stud to
secure alternator support bracket and exhaust manifold to
cylinder head.
2.
Remove locknut (14), washer (15) and alternator support bracket (1) from exhaust manifold (4) and
stud (2). Discard locknut (14).
3.
Remove stud (2) and washer (3) from exhaust manifold (4) and cylinder head (6).
4.
Using hex-head driver, remove seven socket-head screws (12) and washers (13) from exhaust
manifold (4) and cylinder head (6).
WARNING
• Vehicles with serial numbers USBL Eff. 1 through 118767 have
manifold gaskets containing asbestos fibers. When performing
manifold maintenance, place used gaskets in a plastic, leakproof,
sealed bag or container and contact the local health and safety
department for further disposal instructions.
• Failure to observe above warning may result in an environmental
hazard.
5.
Remove exhaust manifold (4), gasket (5), and manifold seal (10). Discard gasket (5) and manifold
seal (10).
6.
Clean all gasket material from head mounting surface and manifold mating surface.
a. Removal
INITIAL SETUP:
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Special Tools
Hex-head driver, 8mm, (Appendix B, Item 156)
Materials/Parts
Gasket (Appendix G, Item 50)
Four locknuts (Appendix G, Item 128)
Manifold seal (Appendix G, Item 197)
Manual References
TM 9-2820-280-24P
Equipment Condition
• Engine access cover removed (para. 10-15).
• Oil dipstick tube removed (para. 3-2).
• 60 ampere alternator removed (para. 4-2).
• 100 ampere alternator removed (para. 12-23
or 12-24).
• 200 ampere alternator removed (para. 4-109
or 4-110).
General Safety Instructions
• Do not touch hot exhaust system components
with bare hands.
• Place used gaskets in a plastic, leakproof, sealed
bag or container.
TM 9-2320-280-20-2
3-102
Change 3


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