Injection Timing Adjustment - Isuzu NHR 4J Series Workshop Manual

INJECTION TIMING ADJUSTMENT

• Set No. 1 cylinder to top dead center.
• Remove injection pump distributor head plug.
• Cancel wax CSD with the handle of a screw driver.
• Fit a dial gauge and set lift to 2 mm.
Measuring device: 5-8840-0145-0
• Set crankshaft damper pulley top dead center mark
about 45° before top dead center from the pointer.
6C-40-1.tif
• Set dial gauge in the "0" position.
• Turn the crankshaft a little right wise and left wise and
see if the pointer is stable in the "0" position.
• Turn the crankshaft in the normal direction and read
the measuring device's indication at as follows.
4JB1
4JB1T
4JB1TC
4JG2 (Belt Drive Type) ATDC 1° ('91/ 542A)
6C-40-2.tif
" (Gear Drive Type)
Measuring Device's Indication
• If it reads abnormal, loosen injection pump fixing nut
and pump bracket adjust bolt, make adjustment by
changing the pump mounting angle, and tighten the
nut and bolt to the specified torque where the dial
indicates the specified valve.
Pump fixing nut
6C-40-3.tif
Adjust bolt
• Remove the measuring device and tighten the
distributor head plug to the specified torque.
CAUTION
6C-40-4.tif • When installing the distributor head plug, be sure to
use new copper washer.
• Connect injection pipe.
• Fit pipe clip where specified.
BTDC 14°, BTDC 12° ('91/
542A)
BTDC11°
BTDC4°
TDC 0° ('91/ 542B)
ATDC 2° ('91/ 542A)
Standard
24 (2.4/17)
19 (1.9/14)
17 (1.7/12)
ENGINE FUEL 6C - 41
mm (in)
0.5 (0.0197)
N∙m (Kg∙m/lb∙ft)
N∙m (Kg∙m/lb∙ft)
N∙m (Kg∙m/lb∙ft)