Isuzu engine 4j series. Manual — part 20
6A – 16
GENERAL ENGINE MECHANICAL
REASSEMBLY
6. Valve Guide
•
Apply engine oil to the outside of the valve guide.
Using special tool, drive in a new valve guide from the
rocker arm shaft side.
Valve guide replacer: 9-8523-1212-0
5. Valve Guide Oil Seal
•
Using special tool, drive in a new oil seal
Oil special tool, drive in a new oil seal
Oil seal installer: 5-8840-2033-0
4. Valve
•
Apply engine oil to the outside of the valve stem.
3. Valve Spring
•
Attach the valve seat to the upper spring seat. The
painted area of the valve spring should be facing
downward.
2. Split Collar
•
Use a spring compressor to push the valve spring into
position.
•
Install the spring seat split collar.
•
Set the split collar by tapping lightly around the head of
the collar with a rubber hammer.
Valve spring compressor: 9-8523-1423-0 (J-29760)
1. Rocker Arm Assembly
N∙m (kg∙m/lb∙ft)
54 (5.5/40)
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GENERAL ENGINE MECHANICAL 6A – 17
CAMSHAFT, TAPPET
DISASSEMBLY
1. Cylinder Head Assembly
2. Flywheel
3. Cylinder Block Rear Plate
4. Oil Pan Assembly
5. Oil Pump Assembly
6. Camshaft Timing Gear (Gear Drive Model)
•
Remove the camshaft timing gear bolt from the
camshaft.
NOTE:
Hold the camshaft stationary to prevent the camshaft
from turning.
•
Use the universal puller
!
to pull out the camshaft
timing gear
"
.
•
Universal Puller: 5-8521-0002-0
Remove the thrust plate
#
.
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6A – 18
GENERAL ENGINE MECHANICAL
6a. Camshaft Timing Pulley (Belt Drive Model)
•
Use the timing pulley puller
"
to remove the pulley.
Timing Pulley Puller: 5-8840-0086-0
•
Remove the stopper bolt.
7. Camshaft Thrust Plate (Gear Drive Model)
7a. Camshaft Pulley Center (Belt Drive Model)
8. Camshaft
9. Tappet
INSPECTION AND REPAIR
Make the necessary adjustment, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.
1. Measure the Camshaft Thrust Clearance
•
Use a dial indicator to measure the camshaft end play.
This must be done before removing the camshaft
gear.
If the camshaft end play exceeds the specified limit,
the thrust plate must be replaced.
Camshaft End Play
mm (in)
Standard
Limit
0.08 (0.0031)
0.2 (0.0079)
2. Camshaft Journal Diameter
•
Use a micrometer to measure each camshaft journal
diameter in two directions
!
and
"
. If the measured
value is less than the specified limit, the camshaft
must be replaced.
Journal Diameter
mm (in)
Standard
Limit
49.945 - 49.975 (1.9663 - 1.9675)
49.60 (1.9528)
3. Cam Height
•
Measure the cam height
H
with a micrometer. If the
measured value is less than the specified limit, the
camshaft must be replaced.
Cam Height
mm (in)
Standard
Limit
42.02 (1.6543)
41.65 (1.6398)
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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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