TM-9-2320-272-24-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998
TM-9-2320-272-24-1

  TM-9-2320-272-24-1 - Page 428 of 1015

TM 9-2320-272-24-1
3-19. FUEL INJECTOR TUBE (M939A2) MAINTENANCE (Contd)
b. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para. 2-15.
3.
Inspect fuel injection tubes (11) for cracks or dents. If cracked or dented, replace fuel injection
tubes (11).
4.
Inspect fuel manifold (5) for cracks or dents. If cracked or dented, replace fuel manifold (5).
5.
Replace all parts failing inspection.
c. Installation
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
CAUTION
l
Injector tubes deliver fuel at high pressure causing them to
expand and contract. Ensure injector tubes are securely
clamped and routed so they do not come in contact with each
other or any engine component. Failure to do so may result in
premature injector tube failure.
l
Injector tubes must be installed in correct positions as tagged.
Failure to do so may result in damage to tubes and engine
malfunction.
Install four isolators (19), brace (20), and two tube braces (18) on six fuel injector tubes (11) with
four washers (17) and screws (16). Finger tighten screws (16).
Install two isolators (14) and tube braces (13) on fuel injector tubes (11) with four washers (15) and
screws (12). Finger tighten screws (12).
Install two isolators (23) and tube braces (22) on fuel injector tubes (11) with washer (24) and screw
(21). Finger tighten screw (21).
Install two isolators (27) and tube braces (26) on injector tubes (11) with two washers (28) and
screws (25). Finger tighten screws (25).
Install six fuel injector tubes (11) on cylinder head (8) with washer (2) and screw (1).
Position six fuel injector tubes (11) on fuel injection pump (9) and fuel injectors (6).
Connect six fuel tube nuts (10) to fuel injection pump (9).
Connect six fuel tube nuts (10) to fuel injectors (6).
Tighten two screws (25), screw (21), four screws (12), and screws (16).
NOTE
Banjo seals must face toward fuel injectors to allow installation of
valve cover.
Install fuel manifold (5) and seven new banjo seals (4) on six fuel injectors (6) and fuel supply
tube (7) with seven screws (3).
3-64


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