Isuzu KB P190. Manual - part 1149

7B-32  MSG MODEL 

 

 

 

 
 

11. Mainshaft Ball Bearing 

1) 

Apply the engine oil to the ball bearing inside 

circumference. 

2) Use a bench press and a bearing installer to install the 

bearing. 

 

The bearing snap ring groove must be facing the front of

the transmission. 

 

Bearing Installer : 5-8840-0015-0 (J-22912-01) 

 

 

 

 

 
 

12. Needle  Bearing 

13. 3rd  Gear 

1)  Apply the engine oil to the 3rd needle bearing and the 3rd

gear. 

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

 

The dog teeth of the 3rd gear must be facing the front side

of the transmission. 

 

 

 

 

 

 
 

15. 3rd-4th Synchronizer Assembly 

1)  Apply the recommended lubricating oil to the clutch hub

spline. 

2)  Install the synchronizer assembly to the mainshaft. 

  The sleeve light chamfering 

1

 and the clutch hub heavy 

boss 

2

 must be facing the rear of the transmission. 

 

 

 

 

 

16. Mainshaft Snap Ring 

1) Select the snap ring which will provide the minimum

clearance between the mainshaft and the snap ring. 

 

There are four snap ring sizes available. 

 

The snap rings are numbered to indicate their thickness. 

Mainshaft and Snap Ring Clearance 

mm(in)

Standard 

0 - 0.05 (0 - 0.002) 

 

 

 

Snap Ring Availability 

mm(in)

Thickness

Identification Number

1.50 (0.059)

1

1.55 (0.061)

2

1.60 (0.063)

3

1.65 (0.065)

4

2)  Use a pair of snap ring pliers to install the snap ring to the 

mainshaft. 

MSG MODEL  7B-33 

 

 

 

 

19. Top Gear Shaft 

20. Ball  Bearing 
Use a bench press and a installer to install the ball bearing to 
the top gear shaft. 
The snap ring groove must be facing the front of the 
transmission. 
Bearing Installer : 5-8840-0015-0 (J-22912-01) 
 

 

 

 

 
 

25. Rear Ball Bearing 
Use a bench press and a bearing installer to install the bearing 
to the counter gear. 
Bearing Installer : 5-8840-0015-0 (J-22912-01) 
 

 

7B-34  MSG MODEL 

  REVERSE GEAR AND 5TH GEAR 

 

 

 

Reassembly Steps 

▲  1. Intermediate plate 

▲  2. Reverse idler shaft 
 

3. Bearing snap ring 

 

4. Bearing snap ring 

 

5. Thrust washer 

▲  6. Reverse idler gear 
 

7. Thrust washer 

▲  8. Counter reverse gear lock nut 

▲  9. Thrust washer 
  10. Needle bearing collar 
  11. Needle bearing 
  12. Reverse gear 
▲13. Rev.-5th synchronizer assembly 

▲14. Mainshaft lock nut and washer 
 

 

 
  15. Needle bearing 
  16. 5th block ring 
  17. 5th gear 
▲18. Thrust washer and lock ball 
  19. Counter reverse gear 
  20. Counter 5th gear 
  21. Counter end ball bearing 
▲22. Counter reverse gear nut and washer 

▲23. Thrust washer thrust ring 

▲24. Thrust ring snap ring 
  25. Mainshaft end ball bearing 
  26. Bearing spacer 
  27. Speedometer drive gear and lock ball 
  28. Bearing snap ring 
 

 
 

MSG MODEL  7B-35 

 

 

Important Operations 

1. Intermediate Plate 

2.  Reverse Idler Shaft 

1)  Install the reverse idler shaft to the intermediate plate. 

2)  Tighten the reverse idler shaft bolt to the specified torque. 

Idler Shaft Bolt Torque 

N

⋅m(kgf⋅m/lb⋅ft)

19 (1.9 / 14) 

 

 

 

 

 

3) Set the mainshaft with gear assembly 

1

 and the counter 

gear assembly 

2

 to a holding fixture 

3

. 

 

Holding Fixture : 5-8840-2001-0 (J-29768) 

4)  Place the holding fixture (with the mainshaft and the counter

shaft) in a vise. 

5)  Mesh the 3rd-4th synchronizer to the 3rd gear. 

 

Mesh the 1st-2nd synchronizer to the 1st gear. 

6) Install the intermediate plate to the mainshaft and the

counter gear ball bearings. 

 

 

 

 

 

6.  Reverse Idler Gear 

8.  Counter Reverse Gear Lock Nut 

1)  Apply the engine oil to the idler shaft and the reverse gear

inside circumference. 

2)  Install the reverse gear to the idler shaft. 

3)  Install a new counter reverse gear lock nut. 

 

Never reinstall the old lock nut. 

4)  Tighten the reverse gear lock nut to the specified torque. 

Lock Nut Torque 

N

⋅m (kgf⋅m/lb⋅ft)

108 (11 / 80) 

 

 

 

 

 

9. Thrust Washer 

1)  Apply the engine oil to both sides of the thrust washer. 

2)  Install the thrust washer to the mainshaft. 

 

The thrust washer oil groove must be facing the reverse

gear side.