Isuzu KB P190. Manual - part 357

6A-68  ENGINE MECHANICAL (4JK1/4JJ1) 

Removal 

1.  Remove the cylinder head. 

 

Refer to “Cylinder Head”. 

2.  Remove the split collar. 

•  Use a replacer to compress the valve spring to

remove the split collar. 

 Special 

tool 

 

Valve spring replacer: 5-8840-2818-0 (1) 

 

Pivot assembly: 5-8840-2819-0 (2) 

 

 
 

 

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3.  Remove the spring upper seat. 

•  Remove the special tool to remove the upper 

seat. 

4.  Remove the valve spring. 

  Put the removed valve springs in order by

cylinder number. 

5.  Remove the valve stem oil seal. 

•  Use pliers to remove the oil seal. 

 

 
 
 

 

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Note: 
Do not use the removed oil seal again. 

6.  Remove the spring lower seat. 

ENGINE MECHANICAL (4JK1/4JJ1)  6A-69 

Inspection 

Inspect the valve spring 

Note: 
Check the valve spring visually and if there is clear
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) 

 
 

 
 
 

 

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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) 

 

 

 

 
 

 

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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) 

 
 

 
 
 
 

 

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6A-70  ENGINE MECHANICAL (4JK1/4JJ1) 

Installation 

1.  Install the spring lower seat. 

2.  Install the valve stem oil seal. 

•  Apply engine oil over the peripheral part of the

valve guide and install the oil seal by using a

valve stem seal installer. 

Note: 
After installing the valve stem oil seal, check if it is
inserted nice and deep and the oil seal is not tilted or
the garter spring has not come off. 

Special tool 

Valve stem seal installer: 5-8840-2817-0 

 

 
 
 

 

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3.  Install the valve spring. 

4.  Install the spring upper seat. 

5.  Install the split collar. 

 

•  Use a replacer to compress the valve spring 

and install the split collar. 

 

 

 Special 

tool 

 

Valve spring replacer: 5-8840-2818-0 (1) 

 

Pivot assembly: 5-8840-2819-0 (2) 

 

 
  

 

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Note: 
Move it up and down to check if it moves smoothly. 

6.  Install the cylinder head. 

 

Refer to “Cylinder Head”. 

 

ENGINE MECHANICAL (4JK1/4JJ1)  6A-71 

Special Tools 

ILLUSTRATION 

PART NO. 

PART NAME 

 

 

 

 

5-8840-2818-0 

Valve spring replacer 

 

 

 

 

5-8840-2819-0 

Pivot assembly 

 

 

 

 

5-8840-2817-0 

Valve stem seal installer