Isuzu KB P190. Manual - part 224

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

6A – 92  ENGINE MECHANICAL 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oil Seal Installation 

Use the special tool to install the front oil seal. 

Front Oil Seal Installer: 5-8840-2361-0 

1.  With the oil seal attached to the sleeve, insert it into the 

front end section of the crankshaft. 

2.  With the oil seal end section attached securely to the 

crankshaft, tighten up the center bolt until the sleeve hits 
the front end reference plane of the crankshaft securely. 

3.  Remove the sleeve. 

4.  With the seal pressed in, check the dimension of the oil 

seal section. 

Standard Dimension = 1.0 

±

 0.03mm 

 

NOTE: 

Install the oil seal after assembling the timing pulley 
housing. The oil seal lip section is applied with oil. 

Take notice of the press-in direction of the oil seal. 

 

020R300005

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 (4

φ) 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

6A – 94  ENGINE MECHANICAL 

CYLINDER HEAD 

 

 
 

 

 

RTW46ALF001301 

 

 

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