Isuzu A-4JA1 User Manual

Segment Mica Depth Measurement
Use a depth gauge to measure the segment mica depth.
If the measured value exceeds the limit, the segment
mica must be undercut.
Segment Mica Depth mm(in.)
Standard Limit
0.5 – 0.8
(0.02 – 0.03)
0.2 (0.008)
ENGINE ELECTRICALS
Commutator Run-Out Test
Use a dial indicator and a V-block to measure the com-
mutator runout.
If the measure value exceeds the limit, the commutator
must be replaced.
Commutator Run-Out mm(in.)
Standard Limit
0.02 (0.0008) 0.05 (0.002)
155
Commutator Outside Diameter Measurement
Use a vernier caliper to measure the commutator out-
side diameter.
If the measured value exceeds the limit, the armature
must be replaced.
Commutator Outside Diameter mm(in.)
Standard Limit
S13 – 11 30.0 (1.18) 29.0 (1.14)
S24 – 07 36.5 (1.44) 35.5 (1.40)
Bearing Inspection
Visually inspect the bearing.
If the bearing is worn or damaged, it must be replaced.

Isuzu A-4JA1 Specifications

General

Brand	Isuzu
Model	A-4JA1
Category	Engine
Language	English