Brush Spring Inspection; Brush Holder Insulation Test; Pinion Clutch; Pinion Inspection - Isuzu A-4JA1 Workshop Manual

Brush Spring Inspection

Visually check the brush spring for weakness and rust-
ing.
Replace the brush spring if it is weak or rusted.
Use a spring balancer to measure the spring tension.
If the measured valve exceeds the limit, the brush spring
must be replaced.

Brush Holder Insulation Test

Use a circuit tester to check the brush holder insulation.
1. Touch one probe to the field winding lead wire.
2. Touch the other probe to the brush.
There should be no continuity.
If there is continuity, the brush holder must be
repaired or replaced.

PINION CLUTCH

Pinion Inspection

Use your hand to turn the pinion in the direction of star-
ter motor rotation. The pinion should turn freely.
Try to turn the pinion in the opposite direction. The
pinion should lock.
Check the bearing for binding or play by spinning the
ball bearing by holding the outer race with fingers.
MAGNETIC SWITCH
Check for continuity across the magnetic switch "S"
terminal and coil case. If no continuity exists, the shunt
coil is open and should be replaced.
ENGINE ELECTRICALS
157