Injection Timing; Injection Timing Confirmation Procedure; In-Line Type Injection Pump - Isuzu A-4JA1 Workshop Manual

MAINTENANCE
1
3
24
2
3
2
1
Rotate the crankshaft 360°.
Realign the crankshaft damper pulley TDC line with the
timing pointer.
Adjust the clearances for the remaining valves as shown
in the illustration. (At TDC on the compression stroke of
the No. 4 stroke)

INJECTION TIMING

Injection Timing Confirmation Procedure

1.

In-line type injection pump

1) Rotate the crankshaft clockwise to align the cam-
shaft gear timing mark "O" with the timing gear
case cover pointer.
The No. 1 cylinder will now be at the point where
nearly injection timing.
2) Remove the No. 1 fuel injection pipe.
3) Remove the delivery valve holder 1 , the delivery
valve spring 2 , and the delivery valve 3 .
4) Tighten the delivery valve holder to the specified
torque.
Delivery Valve Holder Torque
4.0 – 4.5 (28.9 – 32.5/39.2 – 44.1)
5) Operate the injection pump priming pump while
slowly rotating the crankshaft until fuel stops flow-
ing from the delivery valve holder.
6) Conform that the crankshaft damper pulley notched
line is aligned with the timing gear case cover
pointer.
Injection Timing (Static BTDC)
7) Remove the delivery valve holder.
8) Install the delivery valve 1 , the delivery valve
spring 2 , and the delivery valve holder 3 .
9) Tighten the delivery valve holder to the specified
torque.
10) Install the fuel injection pipes and tighten them to
the specified torque.
Fuel Injection Pipe Torque
2.0 – 4.0 (14.4 – 28.9/19.6 – 39.2)
11) Operation to air breeding.
kgf·m(lb.ft/N·m)
14°
kgf·m(lb.ft/N·m)