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.