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.