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Isuzu NKR 4J Series - Camshaft Bearing Replacement

Isuzu NKR 4J Series
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GENERAL ENGINE MECHANICAL 6A – 19
4. Camshaft Run-Out
Mount the camshaft on V-blocks.
Measure the run-out with a dial indicator.
If the measured value exceeds the specified limit, the
camshaft must be replaced.
Run-Out mm (in)
Standard Limit
0.02 (0.008) or less 0.10 (0.0039)
5. Camshaft and Camshaft Bearing Clearance
Use an inside dial indicator to measure the camshaft
bearing inside diameter.
Camshaft Bearing Inside Diameter mm (in)
Standard Limit
50.00 - 50.03
(1.9685 - 1.9696)
50.08 (1.9716)
Camshaft Bearing Clearance mm (in)
Standard Limit
0.025 - 0.085
(0.0010 - 0.0033)
0.12 (0.005)
If the clearance between the camshaft bearing inside
diameter and the journal exceeds the specified limit,
the camshaft bearing must be replaced.
Camshaft Bearing Replacement
Camshaft Bearing Removal
1. Remove the cylinder body plug plate.
2. Use the bearing replacer to remove the camshaft
bearing.
Bearing Replacer: 5-8840-2038-0
Camshaft Bearing Installation
1. Align the bearing oil holes with the cylinder body oil
holes.
2. Use the replacer to install the camshaft bearing.
Bearing Replacer: 5-8840-2038-0
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