Isuzu NHR 4J Series, Workshop Manual

Page: 300 / 406

ENGINE FUEL 6C - 41
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.
• 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 BTDC 14°, BTDC 12° (’91/
542A)
4JB1T BTDC11°
4JB1TC BTDC4°
4JG2 (Belt Drive Type) ATDC 1° (’91/ 542A)
TDC 0° (’91/ 542B)
" (Gear Drive Type) ATDC 2° (’91/ 542A)
Measuring Device's Indication mm (in)
Standard 0.5 (0.0197)
• 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 N ∙ m (Kg ∙ m/lb ∙ ft)
24 (2.4/17)
Adjust bolt N ∙ m (Kg ∙ m/lb ∙ ft)
19 (1.9/14)
• Remove the measuring device and tighten the
distributor head plug to the specified torque.
N ∙ m (Kg ∙ m/lb ∙ ft)
17 (1.7/12)
CAUTION
• When installing the distributor head plug, be sure to
use new copper washer.
• Connect injection pipe.
• Fit pipe clip where specified.
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