Isuzu KB P190. Manual - part 1148

7B-28  MSG MODEL 

 

 

BALL BEARING PLAY 

Use a dial indicator to measure the ball bearing play. 
Ball Bearing Play 

mm(in)

Limit 

0.2 (0.0079) 

 
 

 

FRONT COVER OIL SEAL 

Oil Seal Replacement 
Oil Seal Removal 

Use a screwdriver to pry the oil seal from the front cover. 
 

 

 

 

 

Oil Seal Installation 

1. Use a oil seal installer to install the oil seal to the front 

cover. 

 

Oil Seal Installer : 5-8840-0026-0 (J-26540) 

2.  Apply engine oil to the oil seal lip. 
 

 
 

REAR COVER OIL SEAL 

Oil Seal Replacement 
Oil Seal Removal 

Use a screwdriver to pry the oil seal from the rear cover. 
 

 

 

 

 

Oil Seal Installation 

1.  Use a oil seal installer to install the oil seal to the rear cover.

 

Oil Seal Installer : 5-8522-0050-0 (J-29769) 

2.  Apply engine oil to the oil seal lip. 
 

 

MSG MODEL  7B-29 

  REASSEMBLY 

 

MAJOR COMPONENT 

INTERNAL PARTS

 

 

Reassembly steps 

 

1. Top & main gear shaft assembly 

 

2. Counter gear shaft assembly 

 

3. Rev. and 5th gear assembly 

 

 

 
 

4. Shift arm assembly & interlock pin 

 

5. Detent assembly 

 

 

7B-30  MSG MODEL 

  MINOR COMPONENTS 

 

TOP GEAR SHAFT, MAINSHAFT GEAR AND COUNTER GEAR 

 

 

Reassembly Steps 

 1. 

Mainshaft 

▲  2. Needle bearing 

▲  3. 2nd gear 
 

4. 2nd block ring 

▲  5. 1st-2nd synchronizer assembly 
 

6. 1st block ring 

▲  7. Needle bearing collar 

▲  8. Needle bearing 

▲  9. 1st gear 

▲10. 1st gear thrust washer 

▲11. Mainshaft ball bearing 

▲12. Needle bearing 

▲13. 3rd gear 
 

 

 
  14. 3rd block ring 
▲15. 3rd-4th synchronizer assembly 

▲16. Mainshaft snap ring 
  17. Needle bearing 
  18. 4th block ring 
▲19. Top gear shaft 

▲20. Ball bearing 
  21. Top gear shaft snap ring 
  22. Counter gear 
  23. Front ball bearing 
  24. Bearing snap ring 
▲25. Rear ball bearing 
 

 

MSG MODEL  7B-31 

 

 

 

 

Important Operations 

2. Needle Bearing 

3. 2nd Gear 

1)  Apply the engine oil to the 2nd needle bearing and the 2nd 

gear. 

2) Install the needle bearing and the 2nd gear to the

mainshaft. 

 

The dog teeth of the 2nd gear must be facing the rear side

of the transmission. 

 

 

 

5.  1st-2nd Synchronizer Assembly 

1)  Apply the engine oil to the clutch hub spline. 

2)  Install the synchronizer assembly to the mainshaft. 

 

The outside sleeve heavy chamfering must be facing the

rear of the transmission. 

1

  Chamfer Angle = 30

° 

2

  Chamfer Angle = 45

° 

 

 

 

 

 

7.  Needle Bearing Collar 
Use a bench press and a collar installer to install the needle 
bearing collar. 
Collar Installer : 5-8840-0178-0 (J-33851) 
 

 

 
 

8. Needle Bearing 

9. 1st Gear 

1)  Apply the engine oil to the 1st needle bearing and the 1st

gear. 

2)  Install the needle bearing and the gear to the mainshaft. 

 

The dog teeth of the 1st gear must be facing the front side

of the transmission. 

 

 

 

10. 1st Gear Thrust Washer 
Install the thrust washer to the mainshaft. 
The thrust washer oil groove must be facing the 1st gear side.