Page 857 of 6020

6A – 52 ENGINE MECHANICAL
RTW 36ASH000801
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 mm (in)
Standard Limit
0.07 (0.0028) 0.2 (0.0079)
4JA1T(L)
040R300009
14. Idle Gear Shaft
15. Crankshaft Timing Gear
4JA1TC/4JH1TC RTW 36ASH001301
16. Injection Pump
1. Remove the injection pump cover (4JA1TC/4JH1TC only).
2. Remove the injection pump bracket.
3. Pull the injection pump along with the injection pump timing gear free toward the rear of the engine.
NOTE:
Plug the injection pump delivery ports with the caps to
prevent the entry of foreign material.
17. Flywheel
Loosen the flywheel bolts in numerical order a little at a
time.
Use the gear stoper to stop the flywheel gear.
Gear stoper: 5-8840-0214-0
18. Crank Case
19. Oil Pump With Oil Pipe
015RY00001
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Page 858 of 6020

ENGINE MECHANICAL 6A – 53
20. Camshaft Timing Gear
1. 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
0.050 - 0.114
(0.002 - 0.0044) 0.20
(0.008)
2. Remove the camshaft timing gear bolt from the
camshaft.
Note:
Hold the camshaft stationary to prevent the camshaft
from turning.
3. Remove the sensor rotor plate.
4. Use the universal puller to pull out the camshaft timing gear.
Universal Puller: 5-8521-0002-0
5. Remove the thrust plate.
21. Camshaft Thrust Plate
22. Camshaft
Jiggle the camshaft with your hand as you pull it free from
the front of the engine.
23. Timing Gear Case
24. Cylinder Body Rear Plate
25. Piston Cooling Oil Jet The oiling jet uses thin steel tubing which is easily bent.
Accidental contact between the oiling jet and the cylinder
body, piston, or a tool will damage the oiling jet.
Never attempt to repair a damaged oiling jet. Replace it
with a new one.
014RT0001
901R100008
014RY00019
052RY00001
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ISUZU KB P190 2007
Page 859 of 6020

6A – 54 ENGINE MECHANICAL
26. Connecting Rod Bearing Cap with Lower Bearing
If the connecting rod lower bearings are to be reinstalled,
mark their fitting positions by tagging each bearing with the
cylinder number from which it was removed.
27. Piston and Connecting Rod with Upper Bearing
1. Remove carbon deposits from the upper portion of the cylinder wall with a scraper before removing the piston
and connecting rod.
2. Move the piston to the top of the cylinder and tap it with a hammer grip or a similar object from the
connecting rod lower side to drive it out.
RTW 36ASH001501
If the connecting rod upper bearings are to be reinstalled,
mark their fitting positions by tagging each bearing with the
cylinder number from which it was removed.
28. Crankshaft Bearing Cap with Lower Bearing
1. Measure the crankshaft end play at the center journal of the crankshaft.
Do this before removing the crankshaft bearing caps.
If the measured value exceeds the specified limit, the
crankshaft thrust bearing must be replaced.
Crankshaft End Play mm (in)
Standard Limit
0.10 (0.004) 0.30 (0.012)
014LX056
015LX018
015RY00002
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Page 860 of 6020
ENGINE MECHANICAL 6A – 55
2. Loosen the crankshaft bearing cap bolts in numerical order a little at a time.
If the crankshaft bearings are to be reinstalled, mark
their fitting positions by tagging each bearing with the
cylinder number from which it was removed.
29. Crankshaft Thrust Bearing
30.Crankshaft
31. Crankshaft Upper Bearing If the crankshaft upper bearings are to be reinstalled, mark
their fitting positions by tagging each bearing with the
cylinder number from which it was removed.
32. Tappet
If the tappets are to be reinstalled, mark their fitting
positions by tagging each tappet with the cylinder number
from which it was removed.
33. Crankshaft Rear Oil Seal
• W ith the oil seal pushed in deep, install the special
tool as shown in the illustration and remove the oil
seal.
Oil Seal Remover: 5-8840-2360-0
34. Cylinder Body
015RY00003
015RY00004
015RY00005
015LV002
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ISUZU KB P190 2007
Page 861 of 6020
6A – 56 ENGINE MECHANICAL
MINOR COMPONENTS
ROCKER ARM SHAFT AND ROCKER ARM
Disassembly Steps
1. Rocker arm shaft snap ring 5. Rocker arm shaft spring
2. Rocker arm 6. Rocker arm shaft snap ring
3. Rocker arm shaft bracket 7. Rocker arm shaft
4. Rocker arm
Disassembly
1. Rocker Arm Shaft Snap Ring
2. Rocker Arm
3. Rocker Arm Shaft Bracket
1. Use a pair of pliers to remove the snap rings.
2. Remove the rocker arms.
3. Remove the rocker arm shaft brackets. If the rocker arms and rocker arm shaft brackets are to
be reinstalled, mark their installation positions by
tagging each rocker arm and rocker arm shaft bracket
with the cylinder number from which it was removed.
4. Rocker Arm
5. Rocker Arm Shaft Spring
6. Rocker Arm Shaft Snap Ring
7. Rocker Arm Shaft
011RY00009
011RY00010
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Page 862 of 6020
ENGINE MECHANICAL 6A – 57
CYLINDER HEAD
RTW46ALF001201
Disassembly Steps
1.
Intake manifold 6.
Intake and exhaust valve
2.
Intake manifold gasket 7.
Valve stem oil seal
3.
Split collar 8.
Valve spring lower seat
4.
Valve spring upper seat 9.
Cylinder head
5.
Valve spring
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ISUZU KB P190 2007
Page 863 of 6020
6A – 58 ENGINE MECHANICAL
Disassembly
1. Intake Manifold
2. Intake Manifold Gasket
3. Split Collar
1. Place the cylinder head on a flat wooden surface.
2. Use the spring compressor to remove the split collars. Do not allow the valve to fall from the cylinder head.
Spring Compressor: 9-8523-1423-0
4. Valve Spring Upper Seat
5. Valve Spring
6. Intake and Exhaust Valve
If the intake and exhaust valves are to be reinstalled, mark
their installation positions by tagging each valve with the
cylinder number from which it was removed.
If the intake and exhaust valves are to be replaced, the
valve guides must also be replaced.
7. Valve Stem Oil Seal
8. Valve Spring Lower Seat
9. Cylinder Head
011RY00011
011LX022
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Page 864 of 6020
ENGINE MECHANICAL 6A – 59
PISTON AND CONNECTING ROD
RTW46ALF000301
Disassembly Steps
1.
Connecting rod bearing 4.
Piston pin
2.
Piston ring 5.
Connecting rod
3.
Piston pin snap ring 6.
Piston
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ISUZU KB P190 2007