Isuzu KB P190. Manual — part 214
ENGINE MECHANICAL 6A – 51
10. Timing Gear Case Cover
The timing gear case is tightened together with the
injection pump at the 6 points indicated by the arrows in
the illustration.
11. Water Pump
12. Idle Gear B and shaft
Before removing the idle gear B, install bolt (M6,L=30) to
the hole marked with an arrow in the illustration to hold the
scissor gear in place.
13. Idler Gear "A"
1. Measure the camshaft timing gear backlash and the
crankshaft timing gear backlash before removing the
idler gear.
2. Measure the idler gear end play before removing the
idler gear.
NOTE:
Refer to the following items for details on the backlash
and end play measurement procedures.
Timing Gear Backlash Measurement
1. Set a dial indicator to the timing gear to measured.
Hold both the gear to be checked and the adjusting
gear stationary.
2. Move the gear to be checked as far as possible to
both the right and the left.
Take the dial indicator reading.
If the measured value exceeds the specified limit, the
timing gear must be replaced.
Timing Gear Backlash
mm (in)
Standard Limit
0.10 - 0.17 (0.0039 - 0.0067)
0.30 (0.012)
020L200006
020L200020
020RY00019
020RY00020
6A – 52 ENGINE MECHANICAL
RTW36ASH000801
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
RTW36ASH001301
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
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
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.
RTW36ASH001501
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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