Isuzu A-4BG1 Workshop Manual page 39

MAINTENANCE 2-13
Notchled fines
Coupling bolt
q CI)
c l
*c
lzl
IBI
a
Kl
a
4
5 .
6 .
7 .
8 .
Do a fine injection pump position
adjustment, while
continue the pumping operation to
feed the fuel,
and stop to pivot the injection
pump when the
fuel
stop to flow out from the No.
1
delivery valve
holder.
Tighten the four injection pump fixing nuts.
Once remove the No.
1
delivery valve holder, and
reinstall
the delivery valve, spring
and the valve
holder with the specified torque.
Install the No. 1 injection pipe and tighten it to the
specified torque.
COUPLING DRIVEN INJECTION PUMP TIMING ADJUST-
MENT
The coupling driven injection pump is installed at the
middle of the cylinder body. It is driven by the injection
pump drive shaft.
1. Injection timing is initially adjusted by aligning the
notched line 5 on the crankshaft damper pulley with
the pointer 6.
Fine adjustment is made by rotating the injection
pump drive coupling.
Rotating the injection pump drive coupling counter-
clockwise will
advance the
injection
timing.
Rotating
the
injection pump drive
coupling clock-
wise will
retard the injection timing.
2. Loosen the two coupling bolts on the injection pump
drive coupling.