Isuzu NHR 4J Series, Руководство по ремонту

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6A1 – 24 4JB1/4JB1T/4JB1TC/4JG2 - ENGINE
7. Noise Cover Spacer
8. Timing Gear Case Cover
9. Oil Pipe
10. Idler Gear
1) Measure the camshaft timing gear backlash and the
crankshaft timing gear backlash before removing the
idler gear.
2) Measure the idler gear end play before removing the
idler gear.
NOTE:
Refer to the following items for details on the
backlash and end play measurement procedures.
Timing Gear Backlash Measurement
1) Set a dial indicator to the timing gear to measured.
Hold both the gear to be checked and the adjoining
gear stationary.
2) Move the gear to be checked as far as possible to
both the right and the left.
Take the dial indicator reading.
If the measured value exceeds the specified limit, the
timing gear must be replaced.
Timing Gear Backlash mm (in)
Standard Limit
0.10-0.17 (0.0039-0.0067) 0.30 (0.012)
Idler Gear "A" End Play Measurement
Insert a feeler gauge between the idler gear and the thrust
collar to measure the gap and determine the idler gear
end play.
If the measured value exceeds the specified limit, the
thrust collar must be replaced.
Idle Gear End Play
mm (in)
Standard Limit
0.07 (0.0028) 0.2 (0.0079)
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