Checking the generator without removing it from the car (VAZ-2110)

To perform the generator testing work you will need:

• multimeter (in voltmeter mode with a measurement limit of 1520 V);
• technical stethoscope.
• assistant.

Sequence of execution of the check

1. Prepare the car for repair work.

2. Warm up the car engine to operating temperature (at least 80°C).

3. Turn on all powerful electrical consumers in the car (heated rear window, electric heater fan, high beam headlights, heated seats).

Note: Further testing of the generator should be performed with an assistant.

4. By pressing the gas pedal and monitoring the engine operation using the tachometer, we maintain the engine crankshaft speed within 3000-3500 rpm.

5. Using a voltmeter, measure the voltage at the terminals of the battery. If the generator is in good working order, the voltmeter should show a voltage of at least 13 V.

Note: If the voltage is less than 13 V, the alternator belt may be loose, there may be a fault in the alternator circuit, the alternator voltage regulator may be faulty, the alternator brushes may be oily or worn out, or there may be other faults in the alternator itself.

6. Turn off all electrical consumers, while the voltmeter should show a voltage no higher than 14.7 V.

Note: If the voltage is greater than 14.7V, the voltage regulator is most likely faulty.

7. Using a stethoscope, we evaluate the condition of the generator bearings by the noise. A loud hum indicates wear of one or both bearings (the most common failure point is the front generator bearing).







The article is taken from an online resource: vazbook