2007 ISUZU KB P190 height

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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 69
3. Check that the rocker arm oil port is free of obstructions. If necessary, use compressed air to clean the rocker arm
oil port.




Rocker Arm Correction
Inspect the rocker arm valve stem contact surfaces for step
wear (1) and scoring (2).
If the contact surfaces have light step wear or scoring, they
may be honed with an oil stone.
If the step wear or scoring is severe, the rocker arm must be
replaced.



CYLINDER BODY
Cylinder Body Upper Face Warpage
1. Remove the cylinder body dowel.
2. Remove the cylinder liner. Refer to "Cylinder Liner Replacement".
















3. Use a straight edge (1) and a feeler gauge (2) to measure
the four sides and the two diagonals of the cylinder body
upper face.
If the measured values exceeds the limit, the cylinder body
must be replaced.

Cylinder Body Upper Face Warpage mm (in)
Standard Limit
0.05 (0.002) or less 0.20 (0.008)


Cylinder Body Height (H) (Reference) mm (in)
Standard
4JA1T(L), 4JA1TC : 244.945-245.055 (9.6435-9.6478)
4JH1TC : 269.945-270.055 (10.6277-10.6320)
4. Reinstall the cylinder liner. Refer to "Cylinder Liner Replacement".
5. Reinstall the cylinder body dowel.


014RY00024
012R100001
012RY00009 014RY00023

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6A – 70 ENGINE MECHANICAL





















Cylinder Liner Bore Measurement
Use a cylinder indicator to measure the cylinder bore at
measuring point (1) in the thrust (2-2) and axial (3-3) directions
of the crankshaft.
Measuring Point (1): 20 mm (0.79 in)
If the measured value exceeds the specified limit, the cylinder
liner must be replaced.


Cylinder Liner Bore mm (in)
Standard Limit
4JA1T(L), 4JA1TC 93.00 (3.6614) 93.08 (3.6646)
4JH1TC 95.40 (3.7559) 95.48 (3.7590)
NOTE:
The inside of the dry type cylinder liner is chrome
plated. It cannot be rebored or honed.
If the inside of the cylinder liner is scored or
scorched, the cylinder liner must be replaced.




















Cylinder Liner Projection Inspection
1. Hold a straight edge along the top edge of the cylinder liner
to be measured.
2. Use a feeler gauge to measure each cylinder liner projection.

Cylinder Liner Projection mm (in)
Standard
0-0.1 (0-0.004)
The difference in the cylinder liner projection height
between any two adjacent cylinders must not exceed 0.03
mm (0.0012 in).












Cylinder Liner Replacement
Cylinder Liner Removal
1. Insert the cylinder liner remover (1) into the cylinder body (from the lower side of the cylinder body) until it makes firm
contact with the cylinder liner.
Cylinder Liner Remover : 5-8840-2039-0 (4JA1L/TC)
: 5-8840-2304-0 (4JH1TC)
2. Use a bench press (2) to slowly force the cylinder liner from the cylinder body.


NOTE:
Take care not to damage the cylinder body upper face
during the cylinder liner removal procedure.
3. Measure the cylinder body upper face warpage. Refer to "Cylinder Body Upper Face Warpage".
012RY00010
012LX016
012RY00012

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE MECHANICAL 6A – 77


CAMSHAFT
Visually inspect the journals, the cams, the oil pump drive gear,
and the camshaft bearings for excessive wear and damage.
The camshaft and the camshaft bearings must be replaced if
these conditions are discovered during inspection.














Camshaft Journal Diameter
Use a micrometer to measure each camshaft journal diameter
in two directions (1 and 2). If the measured value is less than
the specified limit, the camshaft must be replaced.

Camshaft Journal Diameter mm (in)
Standard Limit
49.945 - 49.975
(1.9663 - 1.9675) 49.60 (1.953)














Cam Height
Measure the cam height (H) with a micrometer. If the
measured value is less than the specified limit, the camshaft
must be replaced.

Cam Height (H) mm (in)
Standard Limit
42.016 (1.6542) 41.65 (1.640)



















Camshaft Run-Out
1. Mount the camshaft on V-blocks.
2. Measure the run-out with a dial indicator. If the measured value exceeds the specified limit, the
camshaft must be replaced.

Camshaft Run-Out mm (in)
Standard Limit
0.02 (0.0008) 0.10 (0.004)

014RY00032
014RY00033 014LX092

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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)


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE MECHANICAL (4JK1/4JJ1) 6A-69
Inspection
Inspect the valve spring
Note:
Check the valve spring visually and if there is clea
r
damage or wear, replace it.
1. Free length • Measure free length of the spring and if it is
shorter than the prescribed limit, replace the
spring.

Free length of the valve spring
mm (in)
Inlet / Exhaust
Standard 49.04 (1.93)
Limit 48.15 (1.89)






LNW 21BSH017001
2. 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.
Valve spring squareness mm (in)
Limit 2.1 (0.083)





LNW 21BSH017101
3. Tension
• Use a spring tester to compress the spring to
the installation height. Measure tension of the
compressed spring. If the measurement is
lower than the limit, replace the spring.
Tension of the valve spring N (kg / lb)
Inlet / Exhaust
Installation length mm (in) 37.80 (1.488)
Standard 213 (21.7 / 47.8)
Limit 188 (19.2 / 42.3)







LNW 21BSH056701


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE MECHANICAL (4JK1/4JJ1) 6A-83
Inspection
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is
discovered during inspection.
Cylinder Head Lower Face Warpage
1. Use a straight edge and a thickness gauge to
measure the four sides and the two diagonals o
f
the cylinder head lower face.
2. The cylinder head lower surface warpage is more than the limit, it should be replaced.




RTW 56ASH008901
Cylinder Head Lower Face W arpage mm (in)
Standard 0.05 (0.002) or less
Limit 0.20 (0.0079)
NOTE:
The cylinder head lower face cannot be regrind.









011RY00013
Cylinder Head Height (H) (Reference) mm (in)
Standard 143.4 (5.646)





RTW 56ASH017401
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.



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007