Isuzu NHR 4J Series, Workshop Manual

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6A – 26 GENERAL ENGINE MECHANICAL
Rocker Arm Shaft Run-Out
1. Place the rocker arm shaft on a V-block.
2. Use a dial indicator to measure the rocker arm shaft
central portion run-out.
If the run-out is very slight, correct the rocker arm shaft
run-out with a bench press. The rocker arm must be at
cold condition.
If the measured rocker arm shaft run-out exceeds the
specified limit, the rocker arm shaft must be replaced.
Rocker Arm Shaft Run-Out mm (in)
Limit
4JB1 / 4JB1T / 4JB1TC
4JG2
0.2 (0.008)
REASSEMBLY
7. Rocker Arm Shaft
• Apply a light coat of engine oil to the rocker arm
shafts.
• Position the rocker arm shaft with the large oil hole
(4ø) facing the front of the engine.
• Install the rocker shaft together with the rocker arm,
the rocker arm shaft bracket, and the spring.
6. Rocker Arm Shaft Spring
5. Rocker Arm
4. Rocker Arm Shaft Bracket
3. Rocker Arm
2. Rocker Arm Shaft Snap Ring
1. Rocker Arm Shaft Assembly
• Install the rocker arm shaft assembly in cylinder head.
• Tighten the rocker arm shaft fixing bolts to the
specified torque.
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