Page 1417 of 6020

ENGINE MECHANICAL (4JK1/4JJ1) 6A-57
6. Remove the M6 bolt from the idle gear A.
7. Install the gear case cover. • Apply the liquid gasket (ThreeBond TB-1207B
or equivalent).
RTW 56ASH020101
Legend
1. Apply the liquid gasket
• Install the gasket in slot of the gear case cover.
• Tighten the bolts to the specified torque.
Tightening torque: 8 N ⋅
⋅⋅
⋅
m (0.8 kg ⋅
⋅⋅
⋅
m / 69 lb in)
RTW 56ASH012101
8. Install the vacuum pump.
Tightening torque: 25 N ⋅
⋅⋅
⋅
m (2.5 kg ⋅
⋅⋅
⋅
m / 18 lb ft)
• Install the oil pipe (feed side and return side) o
f
vacuum pump.
• Install the vacuum pipe bracket and vacuum
pipe.
9. Install the power steering pump. • Tighten the nuts to the specified torque.
Tightening torque: 25 N ⋅
⋅⋅
⋅
m (2.5 kg ⋅
⋅⋅
⋅
m / 18 lb ft)
• Connect the bracket (1) of power steering oil
hose.
LTW 56ASH000101
10. Install the crank pulley.
Tightening torque: 294 N ⋅
⋅⋅
⋅
m (30.0 kg ⋅
⋅⋅
⋅
m / 217 lb ft)
11. Install the A/C compressor drive belt and fan belt.
Refer to drive belt tension check procedure fo
r
Heating and air conditioning and Engine cooling in
this manual.
12. Install the cooling fan.
13. Install the fan guide.
14. Install the radiator upper hose.
15. Replenish the engine coolant.
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Page 1418 of 6020
6A-58 ENGINE MECHANICAL (4JK1/4JJ1)
Torque Specifications
LNW 76ALF000601
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ISUZU KB P190 2007
Page 1419 of 6020
ENGINE MECHANICAL (4JK1/4JJ1) 6A-59
Camshaft Assembly
Components
RTW 56ALF000901
Legend 1. Snap Ring
2. Sub Gear
3. Knock Pin
4. Damper Spring 5. Camshaft Gear and Camshaft
6. Camshaft Bearing Cap
7. Bolt
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Page 1420 of 6020
6A-60 ENGINE MECHANICAL (4JK1/4JJ1)
Removal
1. Rotate the crankshaft to make the No. 1 cylinder
meet the compression TDC.
RTW 76ASH001301
Legend
1. TDC
2. Remove the engine cover.
3. Remove the cylinder head cover.
Refer to "Cylinder Head Cover".
4. Install the M5 lock bolt of fixing sub gear.
RTW 56ASH007101
5. Remove the baffle plate (1).
RTW 56ASH006301
6. Remove the camshaft bearing cap and camshaft.
• Check the engraved making on the camshaft
bearing caps.
RTW 56ASH018401
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Page 1421 of 6020
ENGINE MECHANICAL (4JK1/4JJ1) 6A-61
RTW 56ASH013801
Disassembly
1. Remove the sub gear assembly.
• Clamp the camshaft in a vise. Insert soft metal
protectors (aluminum) between the vise
surfaces and the camshaft.
• Use 5-8840-2591-0 to turn sub gear to right
direction to remove the M5 bolt.
RTW 56ASH006801
• Use a pair of snap ring pliers to remove the
scissor gear assembly.
Note:
Take care not to damage the camshaft cams and
journals.
RTW 56ASH006401
2. Remove the camshaft gear.
• Use a press (1) and socket (2) to remove the
camshaft gear (3).
RTW 56ASH006501
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Page 1422 of 6020

6A-62 ENGINE MECHANICAL (4JK1/4JJ1)
3. Remove the dowel pin.
4. Inspect the camshaft visually. • Check if the journal and cam parts of the
camshaft are worn or damaged, if so, replace
it.
LNW 21BSH020201
5. Inspect an end clearance of the camshaft.
• Use a thickness gauge to measure an end
clearance of the camshaft gear and the
camshaft bracket.
• If the measurement exceeds the limit, replace
the camshaft gear or the camshaft.
End clearance of the camshaft mm (in)
Standard 0.085 − 0.205 (0.003 − 0.008)
Limit 0.25 (0.010)
Note:
Measure an end clearance of the camshaft before
disassembling.
RTW 56ASH013901
6. Check if the cam lobe is worn.
• Use a micrometer to measure the height of the
cam lobe.
• If the height of the cam lobe is at the limit o
r
less, replace the camshaft.
Height of the cam lobe mm (in)
Inlet Exhaust
Standard 40.6 (1.60) 40.6 (1.60)
Limit 39.6 (1.56) 39.6 (1.56)
LNW 21BSH020401
7. Check if the camshaft journal is worn.
• Use a micrometer to measure wear which is
not even with a diameter of the camshaft
journal.
• If the measured uneven wear exceeds the limit,
replace the camshaft.
External diameter of the camshaft journal part
mm (in)
Standard 29.909 − 29.930
(1.1775 − 1.1783)
Limit 29.809 (1.1736)
Partial wear of the camshaft journal part mm (in)
Limit 0.05 (0.0020)
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Page 1423 of 6020

ENGINE MECHANICAL (4JK1/4JJ1) 6A-63
LNW 21BSH020501
8. Check if the camshaft is runout.
• Place the camshaft on a V block to measure a
runout with a dial gauge.
• Rotate the camshaft slowly to measure ho
w
much the dial indicator shook. If it exceeds the
limit, replace the camshaft.
Runout of the camshaft mm (in)
Limit 0.05 (0.0020)
LNW 21BSH020601
9. Measure a camshaft journal oil clearance.
a. Measure an inside diameter of the camshaft bearing with a dial gauge.
b. Read the difference between the inside diameter of the camshaft bearing and the
diameter of the camshaft journal.
If the measured oil clearance exceeds the limit, replace the camshaft bearing.
Clearance of the journal part mm (in)
Standard 0.025
− 0.087
(0.0010 − 0.0034)
Limit 0.15 (0.0059)
LNW 21BSH054601
Reassembly
1. Install the dowel pin.
2. Install the camshaft gear. • Align the knock pin with the slot in the camshaft
gear. Use a press to install the camshaft gea
r
to the camshaft.
RTW 56ASH006601
Legend
1. Camshaft
2. Dowel Pin
3. Camshaft Gear
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Page 1424 of 6020

6A-64 ENGINE MECHANICAL (4JK1/4JJ1)
3. Install the sub gear assembly.
• Clamp the camshaft in a vise. Insert soft metal
protectors (aluminum) between the vise
surfaces and the camshaft. Press against the
pin on the left side of the camshaft gear spring
(3) to make a gap on the right side of the
spring. Push the spring into place.
• Align the sub gear pin (2) with the hole in the
right side of the camshaft gear damper spring
(3). Press the sub-gear into place.
RTW 56ASH006701
Legend
1. Snap Ring
2. Sub-gear
3. Damper Spring
4. Camshaft Gear
• Use a pair of snap ring pliers to snuggly install
the snap ring.
4. Tighten sub gear setting bolt.
• Use 5-8840-2591-0 to turn sub gear to right
direction until it aligns with the M5 bolt hole
between camshaft driven gear and sub gear.
• Tighten the M5 bolt to a suitable torque to
prevent the sub-gear from moving.
RTW 56ASH006801
Installation
1. Check the crankshaft to make the No. 1 cylinder
meet the compression TDC.
RTW 76ASH001301
Legend
1. TDC
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