Starter Motor: Testing and Inspection
CHECKING FOR OPERATIONSERVICE ADJUSTMENT PROCEDURES FOR PINION GAP ADJUSTMENT
1. Disconnect the field coil wire from the M-terminal of the magnetic switch.
2. Connect a 12 V battery between the S-terminal and the body.
3. Connect the field coil wire to the M-terminal, and then disconnect it.
4. The pinion will move out.
CAUTION: This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
5. Check the pinion for stopper clearance (pinion gap) with a feeler gauge.
Pinion gap : 0.5 - 2.0 mm (0.020 - 0.079 in.)
6. If the pinion gap is out of specification, adjust by adding or removing gaskets between the solenoid and the front bracket.
MAGNETIC SWITCH PULL-IN TEST
1. Disconnect the field coil wire from the M-terminal of the magnetic switch.
2. Connect a 12 V battery between the S-terminal and the body.
3. Connect the filled coil wire to the M-terminal, and then disconnect it.
CAUTION: This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
4. If the pinion moves out, then the pull-in coil is good. If it doesn't move out, replace the magnetic switch.
MAGNETIC SWITCH HOLD-IN TEST
1. Disconnect the field coil wire from the M-terminal of the magnetic switch.
2. Connect a 12 V battery between the S-terminal and the body.
3. Connect the field coil wire to the M-terminal, and then disconnect it.
NOTE: This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning.
4. If the pinion moves out, everything is in order. If the pinion moves back, the hold-in circuit is open. Then replace the magnetic switch.
FREE RUNNING TEST
1. Place the starter motor in a vise equipped with soft jaws and connect a fully-charged 12 volt battery to starter motor as follows:
2. Connect a test ammeter (100-ampere scale) and carbon pile rheostat as shown is the illustration.
3. Connect a voltmeter (15-volt scale) across starter motor.
4. Rotate carbon pile to the off position.
5. Connect the battery cable from battery's negative post to the starter motor body.
6. Adjust until battery voltage shown on the voltmeter reads 11 volts.
7. Confirm that the maximum amperage is within the specifications and that the starter motor turns smoothly and freely.
Current: Max. 90 Amps
Speed: Min. 2,800 rpm
MAGNETIC SWITCH RETURN TEST
1. Connect field coil wire to the M-terminal of the magnetic switch.
2. Connect a 12 V battery between S-terminal and the body.
NOTE: This test must be performed quickly (in less than 10 seconds) to prevent the coil from burning
3. The pinion will move out
4. When disconnect the S-terminal, if pinion returns quickly to its original position, everything is in order. If it doesn't, replace the magnetic switch.