Isuzu N-Series. Manual — part 821
7B-54 MANUAL TRANSMISSION (MSB)
19. Snap Ring
• Install the built-in snap ring and measure the
clearance between the snap ring and the clutch
hub.
• When the clearance is out of the reference val-
ue, select a snap ring with the maximum thick-
ness that can be inserted from among the
following three types, and built it in.
20. Needle Bearing
• Attach a backing plate to the vise, secure the
main shaft at the top end.
21. Reverse Gear
• Install with the taper cone side turned upward
(rear of transmission).
22. 5th/Reverse Synchronizer Assembly
• Mate the clutch hub and the sleeve so that the
smaller diameter side of the clutch hub boss
and the chamfer of the sleeve outer circumfer-
ence point to the same direction.
• Put the inserts into the clutch hub groove so
that the smaller catch of the insert should be
positioned toward the reverse gear (larger di-
ameter side of the clutch hub boss), and install
the insert spring.
Clutch Hub and Snap Ring Clearance
mm (in)
0 — 0.09 (0 — 0.004)
Snap Ring
mm (in)
Color
Thickness (Reference)
Pink
1.75 — 1.80 (0.069 — 0.071)
White
1.80 — 1.85 (0.071 — 0.073)
Yellow
1.85 — 1.90 (0.073 — 0.075)
N7A0172E
N7A0022E
N7A0021E
N7A0173E
MANUAL TRANSMISSION (MSB) 7B-55
• Assemble the insert springs so that the distanc-
es (A and B) between inserts and the opening
of the spring can be nearly equal, and also this
opening may not be the same direction on both
side.
• Face of the clutch hub with larger boss should
be positioned toward reverse gear (front of
transmission).
• Align the insert with the insert groove of the
block ring.
• Tap the clutch hub boss section with a plastic
hammer to press it in until it contacts closely
with the main shaft stepped section.
• When it is difficult to engage the clutch hub
boss with the main shaft spline, heat the clutch
hub boss section to a temperature between 80
and 120
°C (176 and 248°F) with the piston
heater before assembling.
• Check to see if the reverse gear rotates
smoothly.
23. Snap Ring
• Install the built-in snap ring and measure the
clearance between the snap ring and the clutch
hub.
Legend
1. Larger
2. Smaller
3. Chamfer
N7A0174E
N7A0165E
Legend
1. Chamfer
2. Larger
3. Reverse gear
N7A0175E
N7A0176E
7B-56 MANUAL TRANSMISSION (MSB)
• When the clearance is out of the reference val-
ue, select a snap ring with the maximum thick-
ness that can be inserted from among the
following three types, and built it in.
24. Block Ring
• Align the insert groove of the block ring with the
insert.
25. 5th Gear
• Install with the taper cone side turned reverse
gear side (front of transmission).
26. Thrust Washer
Top Gear Shaft Assembly
27. Ball Bearing
• Install the ball bearing to the top gear shaft and
press it in so that the outer circumference snap
ring side turns to the outside (in the direction
opposite to the gear).
Clutch Hub and Snap Ring Clearance
mm (in)
0 — 0.09 (0 — 0.004)
Snap Ring
mm (in)
Color Thickness
(Reference)
Pink
1.75 — 1.80 (0.069 — 0.071)
White
1.80 — 1.85 (0.071 — 0.073)
Yellow
1.85 — 1.90 (0.073 — 0.075)
N7A0019E
N7A0018E
N7A0017E
MANUAL TRANSMISSION (MSB) 7B-57
28. Snap Ring
N7A0177E
N7A0178E
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