Isuzu A-4JB1 Repair Manual

MAINTENANCE
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 kgf·m(lb.ft/N·m)
4.0 – 4.5 (28.9 – 32.5/39.2 – 44.1)
1
2
3
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)
14°
TDC 17
24
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 kgf·m(lb.ft/N·m)
2.0 – 4.0 (14.4 – 28.9/19.6 – 39.2)
11) Operation to air breeding.
1
2
3

Isuzu A-4JB1 Specifications

General

Brand	Isuzu
Model	A-4JB1
Category	Engine
Language	English