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2
5
4
3
4
TM 9-4940-568-34
5-99
This task covers:
a. Timing
b. Follow-On Maintenance
INITIAL SETUP
5-19. FUEL INJECTION PUMP TIMING.
Equipment Condition
FRS unloaded, (TM 9-4940-568-10)
Disconnect batteries, (TM 9-4940-568-10)
Remove front gear cover (if necessary),
(Para 5-14)
Remove fuel injection pump (if necessary),
(Para 5-17)
Tools and Special Tools
Tool Kit, General Mechanic’s
(Item 67, Appendix F)
Socket Set, 3/8 in. (Item 52, Appendix F)
Tool, Engine Turnover (Item 66, Appendix F)
Wrench, Torque, 3/8 in. (0 to 60 N.m)
(Item 85, Appendix F)
a.
Timing.
NOTE
Pump-to-pump timing is
extremely critical. Pump timing
that is off by only a few
crankshaft degrees causes poor
performance – starting, lack of
power, excessive smoke,
excessive emissions and poor
fuel economy.
(1)
Engine pump timing begins with timing of
the fuel injection pump drive gear (1) to the
camshaft gear (2).
(2)
Locate TDC of compression stroke for
Cylinder No. 1.
(3)
Remove cover (3) from engine (4).
(4)
Install engine turnover tool (5) on engine
(4).
NOTE
Engine model 4B3.9 with
Standyne injection pump will
have the letter “A” on the fuel
injection pump drive gear.
(5)
The letter “A” on the gear must be aligned
with the “O” mark on the camshaft gear.
