Isuzu N-Series. Service manual - part 883

7C-8 CLUTCH (FOR MZZ TRANSMISSION)

COMPONENT PARTS REPLACEMENT

Clutch Assembly

Remove or Disconnect

1. Transmission assembly.

Refer to TRANSMISSION.

2. Pressure plate assembly.
3. Clutch disc assembly.

4. Return spring.

Legend

1. Clutch disc assembly

6. Needle bearing

2. Pressure plate assembly

7. Dust cover

3. Shift block and release bearing

8. Transmission assembly

4. Return spring

9. Clutch shaft

5. Shift fork

10. Set bolt

N7A0545E

N7A0546E

CLUTCH (FOR MZZ TRANSMISSION) 7C-9

5. Shift block and release bearing.

• Use suitable puller to remove the release bearing.

6. Set bolt.
7. Clutch shaft.

•  Use a brass bar to remove the clutch shaft.

8. Shift fork.

9. Dust cover.

10. Needle bearing.

Inspect

• Pressure plate cover for cracks or distortion.
• Diaphragm spring for heat distortion.
• For loose or bent rivets.

• Release bearing for roughness or noise by rotating

the bearing race under light pressure.

• Shift fork for wear or damage.
• Pilot bearing on the crankshaft for roughness by ro-

tating the bearing race under light pressure.

• Replace all parts that would effect proper operation

of the clutch release assembly.

• Replace the flywheel, pressure plate assembly, or

driven plate if found to be scored, burned, warped,
or worn. Do not machine the flywheel or the pres-
sure plate to eliminate these conditions.

Measure

• Pressure plate wear.

If the wear exceeds the limit 0.3 mm (0.012 in), the
pressure plate assembly must be replaced.

• Pressure plate clamping force. Invert the pressure

plate and position an 9.2 mm (0.36 in) thick plate A
over the pressure plate with hydraulic press. Then
observe the load gauge reading when the dimen-
sion B becomes 19 mm (0.75 in) as indicated in the
figure. Replace the pressure plate assembly if the
clamping force is less than 970 kg (2,139 lb).

Legend

1. Key
2. Shift fork
3. Clutch shaft

N7A0547E

N7A0557E

N7A0549E

7C-10 CLUTCH (FOR MZZ TRANSMISSION)

• The depression of the rivet head (1) on the driven

plate (2). 
Replace the clutch disc assembly if the thickness
of the friction material is less than 0.2 mm (0.008
in).

• Clutch Disc warpage.

Limit: 0.6 mm (0.024 in).
Clutch Size: 325 mm (12.80 in).

• Height of the diaphragm spring fingers. Position an

9.2 mm (0.36 in) thick plate under the pressure
plate. Compress the diaphragm spring until the
spring touches the table. Measure the height of the
diaphragm spring fingers. They must be 61.8 —
63.8 mm (2.43 — 2.51 in) high.

• Check the surface of the shift block (1) for wear or

damage.

• Check the surface of the shift fork (2) for wear or

damage.

N7A0216E

N7A0494E

N7A0551E

N7A0552E

CLUTCH (FOR MZZ TRANSMISSION) 7C-11

• Clutch shaft diameters as shown in the figure. If the

diameter is less than 24.5 mm (0.96 in), replace the
clutch shaft and needle bearing.

Install or connect

1. Needle bearing.

• Use a 32 mm (1.26 in) diameter bar to drive the

needle bearing from the marked side of bearing
and install it specified depth as shown in illustra-
tion.

2. Dust seal.

• Before installing the new bearing, apply MoS

2

 con-

tained type grease to the bearing surfaces and the
clearance area between the bearing and the dust
seal.

3. Shift fork.
4. Clutch shaft and key.
5. Set bolt.

• Install the clutch shaft to the clutch housing.
• Key and shift fork onto the clutch shaft assembly.
• Tighten the set bolt.

Tighten:
Set bolt to 13 N

⋅m (1.3 kg⋅m / 113 lb⋅in)

N7A0553E

N7A0554E

N7A0555E

N7A0556E