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 126 of 951

3-57. RIGHT EXHAUST MANIFOLD REPLACEMENT
This task covers:
a. Removal
b. Installation
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)
Three locknuts (Appendix G, Item 128)
Manifold seal (Appendix G, Item 197)
Manual References
TM 9-2820-280-24P
Equipment Condition
• Air horn and elbow removed (para. 3-14).
• Right exhaust manifold heat shield removed
(para. 3-55).
General Safety Instructions
• Do not touch hot exhaust system components
with bare hands.
• Place used gaskets in a plastic, leakproof, sealed
bag or container.
WARNING
Do not touch hot exhaust system components with bare hands. Severe
injury will result.
1.
Remove three locknuts (10), washers (7), capscrews (6), and washers (7) from exhaust
manifold (3) and crossover pipe (9). Discard locknuts (10).
2.
Using hex head driver, remove eight socket-head screws (5) and washers (4) from exhaust manifold (3)
and cylinder head (1).
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.
3.
Remove exhaust manifold (3), gasket (2), and manifold seal (8). Discard gasket (2) and manifold
seal (8).
4.
Clean all gasket material from head mounting surface and manifold mating surface.
CAUTION
Alternate screw tightening. Flanges often break when each screw is
tightened completely before others are snugged up.
NOTE
Ensure replacement gasket has a silver, shiny surface, not a dull,
dark surface, which is characteristic of a gasket containing asbestos.
1.
Install gasket (2) and exhaust manifold (3) to cylinder head (1) with eight socket-head screws (5) and
washers (4). Tighten socket-head screws (5) to 25-33 lb-ft (34-45 N
.
m).
2.
Install exhaust manifold (3) to crossover pipe (9) with manifold seal (8), three washers (7), capscrews
(6), washers (7), and locknuts (10). Tighten locknuts (10) to 37 lb-ft (50 N
.
m).
b. Installation
a. Removal
TM 9-2320-280-20-2
3-104
Change 3


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