Page 865 of 6020

6A – 60 ENGINE MECHANICAL
RTW36ASH001501
Disassembly
1. Connecting Rod Bearing
If the connecting rod bearings are to be reinstalled, mark
their fitting positions by tagging each bearing with the
cylinder number from which it was removed.
015RW041
2. Piston Ring
1. Clamp the connecting rod in a vise. Take care not to damage the connecting rod.
2. Use a piston ring replacer to remove the piston rings. Piston Ring Replacer
Do not attempt to use some other tool to remove the
piston rings. Piston ring stretching will result in
reduced piston ring tension.
3. Piston Pin Snap Ring Use a pair of pliers to remove the piston pin snap rings.
RTW36ASH001601
4. Piston Pin
5. Connecting Rod
6. Piston
Tap the piston pin out with a hammer and a brass bar.
If the pistons and piston pins are to be reinstalled, mark
their installation positions by tagging each piston and piston
pin with the cylinder number from which it was removed.
F06MV015
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Page 866 of 6020

ENGINE MECHANICAL 6A – 61
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
CYLINDER HEAD
Cylinder Head Lower Face Warpage
1. Use a straight edge and a feeler gauge to measure the four sides and the two diagonals of the cylinder head lower
face.
2. The cylinder head lower surface warpage is more than the limit, it should be replaced.
Cylinder Head Lower Face Warpage mm (in)
Standard Limit
0.05
(0.002) or less 0.20
(0.0079)
NOTE:
The cylinder head lower face cannot be reground.
Cylinder Head Height (
H) (Reference) mm (in)
Standard
91.95 – 92.05
(3.620 – 3.624)
Positive Crankcase Ventilation (PCV) Valve
1. Remove PCV valve assembly from cylinder head cover.
2. Inspect the diaphragm for broken.
3. Inspect the spring for broken or weaken.
4. If find any abnormal condition, replace the PCV valve assembly.
011RY00012
011RY00013011RY00014
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ISUZU KB P190 2007
Page 867 of 6020

6A – 62 ENGINE MECHANICAL
Manifold Fitting Face Warpage
Use a straight edge and a feeler gauge to measure the
manifold cylinder head fitting face warpage.
Regrind the manifold cylinder head fitting surfaces if the
measured values are greater than the specified limit but less
than the maximum grinding allowance.
If the measured values exceed the maximum grinding
allowance, the cylinder head must be replaced.
Manifold Fitting Face Warpage mm (in)
Standard Limit Maximum Grinding
Allowance
0.05
(0.002) or less 0.20
(0.008) 0.40
(0.016)
Exhaust Manifold Warpage
Use a straight edge and a feeler gauge to measure the
manifold cylinder head fitting face warpage.
If the measured values exceed the specified limit, the manifold
must be replaced.
Exhaust Manifold Warpage mm (in)
Standard Limit
0.05 (0.002) or less 0.20 (0.008)
Valve Stem and Valve Guide Clearance
Measuring Method-I
1. With the valve stem inserted in the valve guide, set the dial indicator needle to "0".
2. Move the valve head from side to side. Read the dial indicator.
Note the highest dial indication.
If the measured values exceed the specified limit, the valve
and the valve guide must be replaced as a set.
Valve Stem Clearance mm (in)
Standard Limit
Intake Valve 0.039 - 0.071
(0.0015 - 0.0028) 0.200
(0.008)
Exhaust Valve 0.064 - 0.096
(0.0025 - 0.0038) 0.250
(0.0098)
027RY00001
027RY00002
011RY00022
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ISUZU KB P190 2007
Page 868 of 6020

ENGINE MECHANICAL 6A – 63
Measuring Method-II
1. Measure the valve stem outside diameter. Refer to the Item "Valve Stem Outside Diameter".
2. Use a caliper calibrator or a telescoping gauge to measure the valve guide inside diameter.
Valve Guide Replacement
Valve Guide Removal
Use a hammer and the valve guide replacer to drive out the
valve guide from the cylinder head lower face.
Valve Guide Replacer: 9-8523-1212-0
Valve Guide Installation
1. Apply engine oil to the valve guide outer circumference.
2. Attach the valve guide installer to the valve guide.
3. Use a hammer to drive the valve guide into position from the cylinder head upper face.
Valve Guide Replacer: 9-8523-1212-0
4. Measure the height of the valve guide upper end from the
upper face of the cylinder head.
Valve Guide Upper End Height (H) (Reference) mm (in)
12.8-13.2 (0.50-0.52)
NOTE:
If the valve guide has been removed, both the valve
and the valve guide must be replaced as a set.
011LX029
011RY00024
011RY000025 011RY00023
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ISUZU KB P190 2007
Page 869 of 6020

6A – 64 ENGINE MECHANICAL
Valve Stem Outside Diameter
Measure the valve stem diameter at three points.
If the measured value is less than the specified limit, the valve
and the valve guide must be replaced as a set.
Valve Stem Outside Diameter mm (in)
Standard Limit
Intake Valve 7.946 - 7.961
(0.3128 - 0.3134) 7.880
(0.3102)
Exhaust Valve 7.921 - 7.936
(0.3119 - 0.3124) 7.850
(0.3090)
Valve Thickness
Measure the valve thickness.
If the measured value is less than the specified limit, the valve
and the valve guide must be replaced as a set.
Intake and Exhaust Valve Thickness mm (in)
Standard Limit
4JA1T (L) 1.8 (0.07) 1.5 (0.06)
Inlet 1.34 (0.054) 4JA1TC,
4JH1TC Exhaust 1.36 (0.055) 1.1 (0.045)
Valve Depression
1. Install the valve (1) to the cylinder head (2).
2. Use a depth gauge or a straight edge with steel rule to measure the valve depression from the cylinder head lowe
r
surface.
If the measured value exceeds the specified limit, the valve
seat insert must be replaced.
Valve Depression mm (in)
Standard Limit
4JA1T(L) 0.72 (0.029) 1.28 (0.050)
4JA1TC, 4JH1TC 1.17 (0.048) 1.67 (0.068)
011LX027
014RY00020 014RY00021
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ISUZU KB P190 2007
Page 870 of 6020
ENGINE MECHANICAL 6A – 65
Valve Contact Width
1. Check the valve contact faces for roughness and unevenness. Make smooth the valve contact surfaces.
2. Measure the valve contact width. If the measured value exceeds the specified limit, the valve
seat insert must be replaced.
Valve Contact Width mm (in)
Standard Limit
Intake 1.7 (0.067) 2.2 (0.087)
Exhaust 2.0 (0.079) 2.5 (0.078)
Valve Seat Insert Replacement
Valve Seat Insert Removal
1. Arc weld the entire inside circumference (1) of the valve seat insert (2).
2. Allow the valve seat insert to cool for a few minutes. This will invite contraction and make removal of the valve
seat insert easier.
3. Use a screwdriver (3) to pry the valve seat insert free. Take care not to damage the cylinder head (4).
4. Carefully remove carbon and other foreign material from the cylinder head insert bore.
014RY00027
011LX039
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ISUZU KB P190 2007
Page 871 of 6020

6A – 66 ENGINE MECHANICAL
Valve Seat Insert Installation
1. Carefully place the attachment (1) (having a smaller outside diameter than the valve seat insert) on the valve
seat insert (2).
NOTE:
The smooth side of the attachment must contact the
valve seat insert.
2. Use a bench press (3) to gradually apply pressure to the attachment and press the valve seat insert into place.
NOTE:
Do not apply an excessive amount of pressure with
the bench press. Damage to the valve seat insert will
result.
Valve Seat Insert Correction
1. Remove the carbon from the valve seat insert surface.
2. Use a valve cutter (15 °, 45 °, and 75 ° blades) to minimize
scratches and other rough areas. This will bring the
contact width back to the standard value.
Remove only the scratches and rough areas. Do not cut
away too much. Take care not to cut away unblemished
areas of the valve seat surface.
Valve Seat Angle Degree
45
NOTE:
Use an adjustable valve cutter pilot.
Do not allow the valve cutter pilot to wobble inside the
valve guide.
3. Apply abrasive compound to the valve seat insert surface.
4. Insert the valve into the valve guide.
5. Turn the valve while tapping it to fit the valve seat insert.
6. Check that the valve contact width is correct.
7. Check that the valve seat insert surface is in contact with the entire circumference of the valve.
011LX063
014RY00026
011LX037011LX038
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ISUZU KB P190 2007
Page 872 of 6020
ENGINE MECHANICAL 6A – 67
Valve Spring Free Height
Use a vernier caliper to measure the valve spring free height.
If the measured value is less than the specified limit, the valve
spring must be replaced.
Spring Free Height mm (in)
Standard Limit
4JA1T (L) 4JA1TC, 4JH1TC Single spring 48.0 (1.89) 47.1 (1.85)
Valve Spring Squareness
Use a surface plate and a square to measure the valve spring
squareness.
If the measured value exceeds the specified limit, the valve
spring must be replaced.
Spring Squareness mm (in)
Limit
4JA1T (L) 4JA1TC, 4JH1TC Single spring 1.7 (0.070)
Valve Spring Tension
Use a spring tester to measure the valve spring tension.
If the measured value is less than the specified limit, the valve
spring must be replaced.
Valve Spring Tension N (kg/lb)
Compressed
Height Standard Limit
4JA1T (L)
4JA1TC, 4JH1TC Single
spring 38.9mm
(1.53in) 296.0
(30.2/66.4) 257.7
(26.3/57.9)
011LX024
014RY00025
011LX026
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ISUZU KB P190 2007