1942 - 1947 CHEVROLET SHOP MANUAL

Section 12 - Electrical System

the opposite direction on the armature shaft. The tension of the starter pedal return spring holds the pinion out of mesh with the flywheel while the engine is operating.
DISASSEMBLY OF STARTING MOTOR
Before a starting motor is removed from an engine, certain tests should be made to be sure that the starting motor is in need of repair. First check the battery. If the specific gravity is below 1.175, the battery is discharged and should be recharged. Check the battery ground connection at the frame and clean and tighten if necessary. Check the bat­tery terminals. Dirty terminals result in poor con­nection between the battery and the electrical units. They should be cleaned regularly and the battery washed off with a solution of bicarbonate of soda and water.
Remove the starting motor switch and check the contacts to be sure that they are clean and not burned or corroded. If after making the foregoing inspections the starting motor still does not func­tion, it should be removed and disassembled.
To disassemble-remove the starting motor switch, commutator cover band, through bolts and rear housing. Remove the field coil to brush lead machine screws and remove the commutator end frame assembly and then remove the armature.
To remove the drive mechanism, first remove the bolt on which the shift lever pivots and then re­move the shift lever and drive mechanism.
After the starting motor has been completely dis­assembled. Fig. 44, wash all parts, except the over­running clutch, in clean gasoline or cleaning sol­vent.
TESTING STARTING MOTOR PARTS Field Coil Test for Continuous Circuit
12-21
Place the test prod leads on the field coil leads, Fig. 45. If the test lamp lights, the field coils are OK. If the test lamp does not light, there is an open circuit in one or both of the field coils.
Field Coil Test for Ground
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Fig. 46-Field Coil Test for Ground
Place one test prod lead to frame and the other to the field coil lead, Fig. 46. If the test lamp does not light the field coils are OK. If the test lamp lights, one or both field coils are grounded.
Individual Field Coil Test for Ground           
Break soldered connection between the two field coils and test each one separately replacing the field coil found to be grounded.
Field Coil Leads
Inspect the field coil leads where they are sol­dered at the starting switch terminal to be sure that they are tight.
Armature Test for Ground
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Fig. 45-Field Coil Test for Continuous Circuit
F!g. 47-Armature Test for Ground

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