Isuzu N-Series. Manual — part 819
7B-46 MANUAL TRANSMISSION (MSB)
• Wears or damages found on the clutch hub, the
sliding sections of the sleeve, the spline sec-
tions and insert grooves.
Block Ring and Dog Gear Teeth
Clearance
mm (in)
Gear
Standard
Limit
3rd/4th
1.0 (0.04)
0.5 (0.02)
1st/2nd
1.5 (0.06)
0.5 (0.02)
5th
1.5 (0.06)
0.5 (0.02)
N7A1203E
N7A1204E
Clutch Hub Spline Play
(At clutch hub outer cir-
cumference)
mm (in)
Standard
Limit
0 — 0.05 (0 — 0.002)
0.3 (0.01)
Block Ring Groove and
Insert Clearance
mm (in)
Standard
Limit
3.59 — 3.91 (0.141 —
0.154)
4.1 (0.16)
N7A0147E
N7A1206E
MANUAL TRANSMISSION (MSB) 7B-47
Shift Mechanism
Inspect all disassembled parts for wear, damage or oth-
er abnormal conditions.
• Check the shift rod for wear, bent and damage.
• Check the shift arm and shift block groove for
wear or deformation.
• Check the detent spring for weakening and de-
formation.
Clutch Hub Groove and
Insert Clearance
mm (in)
Standard
Limit
0.09 — 0.31 (0.004 —
0.012)
0.4 (0.02)
N7A0149E
N7A0150E
Shift Arm Thickness
mm (in)
Standard
Limit
10.0 (0.39)
9.0 (0.35)
Free Length of Detent
Spring
mm (in)
Standard
Limit
31.6 (1.24)
30.1 (1.19)
N7A0151E
N7A0152E
7B-48 MANUAL TRANSMISSION (MSB)
• The wear of the select lever, and the backlash
and awkward operation of the control box.
Reassembly
Notice:
Clean each part thoroughly.
When assembling parts, apply clean engine oil (SAE
5W-30) to their sliding and mating sections.
Counter Shaft Assembly
1. Spring
• Attach a backing plate to the vise, secure the
counter shaft rear end, and install the springs.
• The spring should be installed to the left of the
inside counter drive gear pin.
Notice:
When replacing the pin with a new one, hammer it in un-
til its height becomes 3 mm (0.12 in) from the gear end
face.
2. Anti-lash Plate
• Assemble the anti-lash plate to the drive gear
so that the drive gear hole (
φ7.7 mm/0.3 in)
comes roughly in line with the hole (
φ7.7 mm/
0.3 in) of the anti-lash plate.
N7A0153E
N7A0154E
N7A0156E
N7A0157E
MANUAL TRANSMISSION (MSB) 7B-49
• With the guide pin aligned with the drive gear
hole (
φ7.7 mm/0.3 in), set the installer to the
guide pin.
Anti-lash Plate Installer: 5-8840-2044-0
• Turn the installer clockwise. When the drive
gear pin comes to the position where it can be
seen fully, put the installer into the drive gear
side to fix the anti-lash plate to the drive gear.
3. Conical Washer
• Install the conical washer above the anti-lash
plate with the convex side (front side) up.
4. Snap Ring
• Use a new snap ring to fix the conical washer.
Notice:
Avoid the reuse of snap ring.
Check visually the anti-lash plate for a warp or curve af-
ter assembly.
Main Shaft Assembly
5. Needle Bearing
• Attach a backing plate to the vise, secure the
main shaft at the spline end.
N7A0158E
N7A0159E
N7A0160E
N7A0161E
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