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 94 of 951

3-37. FUEL DRAIN BACK TUBE REPLACEMENT
This task covers:
a. Removal
b. Installation
INITIAL SETUP:
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Materials/Parts
Lockwasher (Appendix G, Item 191)
Manual References
TM 9-2320-280-10
TM 9-2320-280-24P
Equipment Condition
Air horn removed (para. 3-14).
General Safety Instructions
Do not perform this procedure near fire, flames, or
sparks.
WARNING
Diesel fuel is highly flammable. Do not perform this procedure
near fire, flames, or sparks. Severe injury or death will result.
CAUTION
Cover or plug all hoses and connections immediately after
disconnection to prevent contamination. Remove all plugs prior to
reconnection.
1.
Remove nut (17), lockwasher (18), and engine wiring harness clamp (15) from stud (19). Discard
lockwasher (18).
2.
Remove stud (19) fuel drain back tube (5), clamp (20) fuel supply line (14), and clamp (16) from
cylinder head (23).
3.
Loosen two clamps (10) and disconnect two hoses (11) from fuel drain back tube (5).
4.
Loosen clamp (22) and disconnect fuel return hose (21) from fuel drain back tube (5).
5.
Loosen clamp (4) and disconnect fuel drain back hose (3) from fuel drain back tube (5).
6.
Remove nut (7), washer (8), clamp (9), and fuel drain back tube (5) from valve cover stud (6).
7.
Remove capscrew (1), washer (24), and clamp (12) from front engine cover (13).
8.
Remove drain back tube (5).
1.
Position fuel drain back tube (5) in front of injection pump (2).
2.
Connect fuel return hose (21) to fuel drain back tube (5) with clamp (22).
3.
Connect two hoses (11) to fuel drain back tube (5) with two clamps (10).
4.
Connect fuel drain back hose (3) to fuel drain back tube (5) with clamp (4).
5.
Install fuel drain back tube (5) on valve cover stud (6) with clamp (9), washer (8), and nut (7).
Tighten nut (7) to 13-20 lb-ft (18-27 N
•
m).
6.
Install fuel drain back tube (5) on front engine cover (13) with clamp (12), washer (24), and
capscrew (1). Tighten capscrew (1) to 40 lb-ft (54 N
•
m).
7.
Install fuel supply line (14), clamp (16), fuel drain back tube (5), and clamp (20) on cylinder
head (23)
with stud (19).
8.
Install wiring harness clamp (15) on stud (19) with lockwasher (18) and nut (17).
b. Installation
a. Removal
TM 9-2320-280-20-2
3-72
Change 3


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