1975 Datsun 280z FSM - Spooled up Racing

Engine Electrical System
SERVICE DATA AND SPECIFICATIONS
Manual
transmission
Automatic
transmission
Type SI 14-122N SI 14-182
System voltage V 12
No load
Terminal voltage V 12
Current A Less than 60
Revolution rpm More than 5,000 More than 6,000
Outer diameter of commutator mm (in) More than 34(1.34) More than 39 (1.54)
Brush length mm (in) More than 12.5 (0.49) More than 12 (0.47)
Brush spring tension kg (lb) 1.4 to 1.8 (3.1 to 4.0)
Clearance between bearing metal and
armature shaft mm (in) Less than 0.2 (0.008)
Clearance "L "between pinion front
edge and pinion stopper mm (in) 0.3 to 1.5 (0.012 to 0.059)
TROUBLE DIAGNOSES AND CORRECTIONS
Condition
Starting motor will
not operate.
Noisy starting motor.
Starting motor
cranks slowly.
Probable cause
Discharged battery.
Damaged solenoid switch.
Loose connections of terminal.
Damaged brushes.
Starting motor inoperative.
Loose securing bolt.
Worn pinion gear.
Poor lubrication.
Worn commutator.
Worn brushes.
Discharged battery.
Loose connection of terminal.
Worn brushes.
Locked brushes.
Corrective action
Charge or replace battery.
Repair or replace solenoid switch.
Clean and tighten terminal.
Replace brushes.
Remove starting motor and make test.
Tighten.
Replace.
Add oil.
Replace.
Replace.
Charge.
Clean and tighten.
Replace.
Inspect brush spring tension or repair brush
holder.
EE-12