Isuzu NHR 4J Series Workshop Manual page 200

4a. Timing Belt (Belt Drive Model)
1) Cooling fan assembly
2) Crankshaft damper pulley
3) Timing pulley upper cover
4) Timing pulley lower cover
5) Flange: camshaft pulley
6) Flange: injection pump pulley
7) Timing belt
Above works refer to "TIMING BELT (Belt Type)"
Section in this manual.
8) Camshaft timing pulley
• Use a dial indicator to measure the camshaft end play.
This must be done before removing the oil pump.
If the camshaft end play exceeds the specified limit,
the camshaft and/or the driven gear must be replaced.
Camshaft End Play
6A1-65-1.tif
• Install the stopper bolt
prevent the pulley from turning.
• Loosen the center bolt.
6A1-65-2.tif
• Use the timing pulley puller
Timing Pulley Puller: 5-8840-0086-0
• Remove the stopper bolt.
6A1-65-3.tif
4JB1/4JB1T/4JB1TC/4JG2 – ENGINE 6A1 – 65
Standard
0.08 (0.003)
!
to the timing pulley to
mm(in)
Limit
0.20 (0.008)
"
to remove the pulley.