150
Condition Possible Cause Correction
Starter motor running too
slow (low torque)
If battery and wiring are satisfactory,
inspect starter motor
1. Insufficient contact of magnetic switch
main contacts
2. Layer short–circuit of armature
3. Disconnected, burnt or worn commutator
4. Poor grounding of field coil
5. Worn brushes
6. Weakened brush springs
7. Burnt or abnormally worn end bushings
Replace
Replace
Repair or replace
Repair
Replace
Replace spring
Replace
Starter motor runs, but
does not crank engine
1. Worn pinion tip
2. Poor sliding of starter drive
3. Starter drive slipping
4. Worn teeth on ring gear
Replace starter drive
Replace
Replace
Replace flywheel
Noise 1. Abnormally worn bushings
2. Worn pinion or ring gear
3. Poor sliding of pinion (failure in return
movement)
Replace
Replace pinion or flywheel
Repair or replace
Starter motor does not stop
running
1. Fused contact points of magnetic switch
2. Short–circuit between turns of magnetic
switch coil (layer short–circuit)
3. Failure of returning action in ignition switch
Replace
Replace
Replace
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