Distributor Type Injection Pump; Pump Fixing Bolt - Isuzu A-4JA1 Workshop Manual

2.

Distributor 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 injector pump distributor head plug.
3) Fit a dial gauge and set lift to 1 mm (0.039 in).
4) Set crankshaft damper pulley Top Dead Center mark
about 45° before Top Dead Center from the pointer.
5) Set dial gauge in the "0" position.
Measuring device: 5-8840-0145-0
6) Turn the crankshaft a little rightwise and leftwise
and see if the pointer is stable in the "0" position.
7) Turn the crankshaft in the normal direction and read
the measuring device's indication at TDC.
Starting Timing
080ES002
8) If the injection timing is outside the specified range,
continue with the following steps.
9) Loosen the injection pump fixing nuts and bracket
bolts.
10) Adjust the injection pump setting angle.
• If injection timing will be advanced, move the
• If injection timing will be retarded, move the
Tighten the pump fixing nut, adjust bolt and pump
distribution head plug to the specified torque.

Pump Fixing Bolt

080ES003
Injection Pump
Distributor Head Plug
0.5 (0.02)
injection pump away from the engine.
injection pump toward the engine.
1.9 (13.7/18.6)
1.7 (12.3/16.7)
MAINTENANCE
mm(in.)
kgf·m(lb.ft/N·m)
kgf·m(lb.ft/N·m)
25