2007 ISUZU KB P190 engine oil

6A – 78 ENGINE MECHANICAL
Camshaft and Camshaft Bearing Clearance
Use an inside dial indicator to measure the camshaft bearing
inside diameter.

Crankshaft Bearing Inside Diameter mm (in)
Standard Limit
50.00 - 50.03
(1.968 - 1.970) 50.08 (1.972)
If the clearance between the camshaft bearing inside diameter
and the journal exceeds the specified limit, the camshaft
bearing must be replaced.

Camshaft Bearing Clearance mm (in)
Standard Limit
0.055 (0.0022) 0.12 (0.005)










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



014RY00034
014RY00035 014RY00036

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 79




CRANKSHAFT AND BEARING
Inspect the surface of the crankshaft journals and crankpins for
excessive wear and damage.
Inspect the oil seal fitting surfaces for excessive wear and
damage.
Inspect the oil ports for obstructions.

NOTE:
To increase crankshaft strength, tufftriding (Nitrizing
Treatment) has been applied. Because of this, it is not
possible to regrind the crankshaft surfaces.
Therefore, under size bearing are not available.























Crankshaft Run-Out
1. Set a dial indicator to the center of the crankshaft journal.
2. Gently turn the crankshaft in the normal direction of rotation.
Read the dial indicator as you turn the crankshaft.
If the measured value exceeds the specified limit, the
crankshaft must be replaced.

Crankshaft Run-Out mm (in)
Standard Limit
0.05 (0.002) or less 0.08 (0.003)















Bearing Spread
Use a vernier caliper to measure the bearing spread.
If the measured value is less than the specified limit, the
bearing must be replaced.

Bearing Spread mm
(in)
Limit
4JA1T (L), 4JA1TC 64.5 (2.54)
Creankshaft Bearing
4JH1TC 74.5 (2.93)
Connecting Rod Bearing 56.5 (2.22)


015LX061
015RY00007

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ISUZU KB P190 2007

6A – 82 ENGINE MECHANICAL




































9. Compare the width of the Plastigage attached to either the
crankshaft or the bearing against the scale printed on the
Plastigage container.
If the measured value exceeds the limit, perform the
following additional steps.
1. Use a micrometer to measure the crankshaft outside diameter.
2. Use an inside dial indicator to measure the bearing inside diameter.
If the crankshaft journal and bearing clearance
exceeds the limit, the crankshaft and/or the bearing
must be replaced.

Crankshaft Journal and Bearing Clearance mm (in)
Standard Limit
0.032 - 0.077
(0.0013 - 0.0030) 0.110 (0.0043)
































Crankpin and Bearing Clearance
1. Clean the crankshaft, the connecting rod, the bearing cap, and the bearings.
2. Install the bearing to the connecting rod and the bearing cap.
Do not allow the crankshaft to move when installing the
bearing cap.
3. Prevent the connecting rod from moving.
4. Attach the Plastigage to the crankpin. Apply engine oil to the Plastigage to keep it from falling.
5. Install the bearing cap and tighten it to the two step of anglar tihtening method.
Do not allow the connecting rod to move when installing
and tightening the bearing cap.

Connecting Rod Bearing Cap Bolt Torque
N·m (kg·m/Ib ft)
4JA1T (L), 4JA1TC 78-88 (8.0/57 – 9.0/65)
1st step ; 29.0–29.2 (3.00/22.0–3.01/22.2)4JH1TC
2nd step ; 45°-60 °
015LX129
015LX060

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 87

3. Use a feeler gauge to measure the piston ring gap. If the measured value exceeds the specified limit, the
piston ring must be replaced.

Piston Ring Gap mm (in)
4JA1T (L), 4JA1TC
Standard Limit
1st Compression Ring
2nd Compression Ring 0.3-0.3
(0.0118-0.0197)
Oil Ring 0.250-0.450
(0.0098-0.0177) 1.5
(0.059)


4JH1TC
Standard Limit
1st Compression Ring
2nd Compression Ring 0.3-0.5
(0.0118-0.0197)
Oil Ring 0.250-0.450
(0.0098-0.0177) 1.5
(0.059)


Piston Ring and Piston Ring Groove Clearance
Use a feeler gauge to measure the clearance between the
piston ring and the piston ring groove at several points around
the piston.
If the clearance between the piston ring and the piston ring
groove exceeds the specified limit, the piston ring must be
replaced.

Piston Ring and Piston Ring Groove Clearance mm (in)
4JA1T (L), 4JA1TC
Standard Limit
1st Compression Ring 0.09-0.125
(0.0035-0.0049)
2nd Compression Ring 0.05-0.085
(0.0020-0.0033)
Oil Ring 0.03-0.070
(0.0012-0.0028) 0.15
(0.0059)


4JH1TC
Standard Limit
1st Compression Ring 0.09-0.130
(0.0035-0.0051)
2nd Compression Ring 0.05-0.090
(0.0020-0.0035)
Oil Ring 0.03-0.070
(0.0012-0.0028) 0.15
(0.0059)

015RY00021
015LX025

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 91




IDLER GEAR SHAFT AND IDLER GEAR
Idler Gear "A" Shaft Outside Diameter
Use a micrometer to measure the idler gear shaft outside
diameter.
If the measured value is less than the specified limit, the idler
gear shaft must be replaced.

Idler Gear "A" Shaft Outside Diameter mm (in)
Standard Limit
44.945-44.975
(1.7695-1.7707) 44.845 (1.755)




Idler Gear "A" Shaft inside Diameter
1. Use an inside dial indicator or an inside micrometer to measure the idler gear inside diameter.

Idler Gear Inside Diameter mm (in)
Standard Limit
45.0-45.03
(1.7717-1.7718) 45.10 (1.7756)
If the clearance between the idler gear shaft outside diameter
and the idler gear inside diameter exceeds the limit, the idler
gear must be replaced.

Idler Gear Shaft and Idler Gear Clearance mm (in)
Standard Limit
0.025-0.085
(0.0010-0.0033) 0.200 (0.0079)















TIMING GEAR CASE COVER
Replace the crankshaft front oil seal if it is excessively worn or
damaged.

Crankshaft Front Oil Seal Replacement
Oil Seal Removal
Use a plastic hammer and a screwdriver to tap around the oil
seal to free it from the gear case cover.
Take care not to damage the oil seal lip surfaces.


020RY00025
014LX022
020R300004

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ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 93
REASSEMBLY
INTERNAL PARTS
MINOR COMPONENT
ROCKER ARM SHAFT AND ROCKER ARM


020RY00029

Reassembly Steps
1.
Rocker arm shaft 5.
Rocker arm
2.
Rocker arm shaft snap ring 6.
Rocker arm shaft spring
3.
Rocker arm 7.
Rocker arm shaft snap ring
4.
Rocker arm shaft bracket








Reassembly
1. Rocker Arm Shaft
1. Position the rocker arm shaft with the large oil hole (4φ) facing the front of the engine.
2. Install the rocker arm shaft together with the rocker arm, the rocker arm shaft bracket, and the spring.
2. Rocker Arm Shaft Snap Ring
3. Rocker Arm
4. Rocker Arm Shaft Bracket
5. Rocker Arm
6. Rocker Arm Shaft Spring
7. Rocker Arm Shaft Snap Ring

014RY00037

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ISUZU KB P190 2007

6A – 94 ENGINE MECHANICAL
CYLINDER HEAD




RTW 46ALF001301

Reassembly Steps
1.
Cylinder head 6.
Valve spring upper seat
2.
Valve spring lower seat 7.
Split collar
3.
Valve stem oil seal 8.
Intake manifold gasket
4. Intake and exhaust valve 9. Intake manifold
5.
Valve spring



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ENGINE MECHANICAL 6A – 95
















Reassembly
1. Cylinder Head
2. Valve Spring Lower Seat
3. Valve Stem Oil Seal
1. Apply a coat of engine oil to the oil seal inner face.
2. Use an oil seal installer to install the oil seal to the valve guide.
Oil Seal Installer: 5-8840-2033-0
4. Intake and Exhaust Valve
1. Apply a coat of engine oil to each valve stem before installation.
2. Install the intake and exhaust valves.
3. Turn the cylinder head up to install the valve springs.Take care not to allow the installed valves to
fall free.







5. Valve Spring
Install the valve spring with their fine pitched end (painted)
facing down.

6. Valve Spring Upper Seat









7. Split Collar
1. Use the spring compressor to compress the valve spring into position.
Spring Compressor: 9-8523-1423-0
2. Install the split collars to the valve stem.
3. Set the split collars by tapping around the head of the collar with a rubber hammer.





RTW 46ASH002301








8. Intake manifold gasket
9. Intake manifold
1. Install the manifold gasket with the end having the sharp corners facing the rear of the engine.
2. Install the intake manifold to the cylinder head.
3. Tighten the manifold bolt/nuts to the specified torque.

Manifold Bolt/Nut Torque N·m(kg·m/lbft)
Bolt 19 (1.9/14)
Nut 24 (2.4/17)

011RW 027
011LX055
014RY00039

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ISUZU KB P190 2007