Condition
Motor not running
Starting motor running
but too slow (small torque)
Starting motor running,
but not cranking engine
Noise
Starting motor does not
stop running
Possible Cause
_ Burnt commutator
_ Layer short-circuit of armature
_ Crankshaft rotation obstructed
If battery and wiring are satisfactory,
inspect starting motor
_ Insufficient contact of magnetic switch
main contacts
_ Layer short-circuit of armature
_ Disconnected, burnt or worn commutator
_ Worn brushes
_ Weakened brush springs
_ Burnt or abnormally worn end bush
_ Worn pinion tip
_ Poor sliding of over-running clutch
_ Over-running clutch slipping
_ Worn teeth of ring gear
_ Abnormally worn bush
_ Worn pinion or worn teeth of ring gear
_ Poor sliding of pinion (failure in return
movement)
_ Worn internal or planetary gear teeth
_ Lack of oil in each part
_ Fused contact points of magnetic switch
_ Short-circuit between turns of magnetic
switch coil (layer short-circuit)
_ Failure of returning action in ignition
switch
CRANKING SYSTEM 6G-5
Correction
Replace armature.
Replace.
Repair.
Replace magnetic switch.
Replace.
Repair commutator or
replace armature.
Replace brush.
Replace spring.
Replace bush.
Replace over-running clutch.
Repair.
Replace over-running clutch.
Replace flywheel (M/T) or
drive plate (A/T).
Replace bush.
Replace over-running clutch,
flywheel (M/T) or drive
plate (A/T).
Repair or replace.
Replace.
Lubricate.
Replace magnetic switch.
Replace magnetic switch.
Replace.