Crankshaft Damper Pulley With Dust Seal; Idler Gear; Timing Gear Backlash Measurement; Idler Gear “A” End Play Measurement - Isuzu A-4JA1 Workshop Manual

ENGINE ASSEMBLY ( 1 )
36

11. Crankshaft Damper Pulley with Dust Seal

1) Block the flywheel with a piece of wood to pre-
vent it from turning.
2) Use the damper pulley remover to remove the
damper pulley.
Damper Pulley Remover
16. Idler Gear "A"
Measure the camshaft timing gear backlash, the
crankshaft timing gear backlash, and the idler gear
"A" end play before removing the idler gear "A"
and shaft.

Timing Gear Backlash Measurement

1) Set a dial indicator to the timing gear to be mea-
sured.
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
Standard
0.10–0.17 (0.0039–0.0067)
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.
Idler Gear End Play
Standard
0.07 (0.0028)
mm(in.)
Limit
0.30 (0.012)
mm(in.)
Limit
0.30 (0.012)