Isuzu N-Series. Manual - part 818

7B-42 MANUAL TRANSMISSION (MSB)

26. Conical Washer

27. Anti-lash Plate

• Insert a flat-end screwdriver between the anti-

lash plate and the counter drive gear, and re-
move the anti-lash plate.

Warning:

WARNING:
THE ANTI-LASH PLATE SHOULD BE REMOVED
VERY SLOWLY WITH SPECIAL CARE OTHERWISE
SOME SPRINGS INSTALLED INSIDE THE PLATE
COULD POP OUT AND CAUSE INJURY.

28. Spring

• Remove the 3 springs that are assembled to

the counter drive gear side.

Inspection and Repair

Make the necessary adjustment, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Bearings
Check each bearing, and replace in either of the follow-
ing cases.

• Rotation is not smooth.
• Abnormal sound is generated.
• There is extreme damage or rust.
• Rolling element or rolling contact surface of

needle roller bearing is discolored, extremely
worn or pitted.

N7A0031E

N7A0032E

N7A0033E

N7A0034E

MANUAL TRANSMISSION (MSB) 7B-43

Gears
Check each gear for the following points. Correct a slight
stepped wear or surface roughness with an oil stone or
pencil grinder, or replace the gear if unrecoverable dam-
age is found.

• Break or damage of tooth.
• Roughness or damage of taper cone (contact

surface with block ring).

• Extreme wear of tooth.
• Inspect the dog gear teeth, and replace if hard

contact is found on the force receive side (coast
side) during engine braking.

Ball Bearing Run-out

mm (in)

Limit

0.2 (0.01)

N7A0133E

N7A0134E

Gear Inside Diameter

mm (in)

Gear

Standard

Limit

3rd Gear

42.0 (1.654)

42.1 (1.657)

2nd Gear

54.0 (2.126)

54.1 (2.130)

1st Gear

61.0 (2.402)

61.1 (2.406)

Reverse Gear

54.0 (2.126)

54.1 (2.130)

N7A0135E

N7A0136E

7B-44 MANUAL TRANSMISSION (MSB)

• Wear or damage of the vehicle speed sensor

drive gear and driven gear bushing.

Counter 5th Gear Spline 
Play (At counter 5th gear 
outer circumference)

mm (in)

Standard

Limit

0.18 — 0.43 (0.007 — 

0.017) 

0.45 (0.018)

N7A0137E

N7A0138E

Thrust Washer Thickness

mm (in)

Gear

Standard

Limit

For 2nd Gear

3.0 (0.12)

2.8 (0.11)

For 5th Gear

3.8 (0.15)

3.6 (0.14)

N7A0139E

N7A0140E

MANUAL TRANSMISSION (MSB) 7B-45

Main Shaft
Check the main shaft external surface for any damage
or wear, and its spline sections for wear, damage or
bent.
When there is any abnormal condition, or when it is used
excessively beyond a proper use limit, replace it with
new one.

Synchromesh
Check the components of the synchronizer for any ab-
normal conditions. When there are uneven slight wears
or rough surfaces, improve them with an oil stone or
pencil grinder.
When they are abnormally damaged, or when they are
used excessively beyond a proper use limit, replace
them with new one.

• Damages or wears found on the taper, gear

and insert groove sections of the block ring.

Main Shaft Run-out

mm (in)

Standard

Limit

0.025 (0.0010) or Less

0.1 (0.004)

N7A0141E

N7A0142E

N7A0143E

N7A0144E