The generator is mounted on a bracket at the front of the engine on the right side.
Technical characteristics of the G-221 generator
Maximum output current (at 13 V and rotor speed of 5000 min⁻¹), A | 42 |
| Working voltage, V | 13,9–14,5 |
| Belt drive ratio | 1:2,04 |
| Direction of rotation (from the drive side) | right |
The stator and generator covers are connected by four bolts. The rotor shaft rotates in two sealed ball bearings. The bearings are lubricated for the entire service life of the generator. The inner ring of the rear bearing is pressed onto the rotor shaft, and the outer ring is pressed into the rear cover. The second rotor bearing is pressed into the front cover and clamped on both sides by plates with four bolts.
The stator winding is three-phase, connected according to the "star" scheme. The battery charging indicator relay is connected to the neutral wire terminal. If the indicator lamp lights up after starting the engine, there is a fault in the generator circuit.
The rectifier is a bridge circuit and consists of six power limiting diodes. They are pressed into two horseshoe-shaped aluminum radiator plates. The plates are combined into a rectifier unit, fixed to the rear cover of the generator.
The excitation winding of the generator is located on the rotor. The winding terminals are soldered to two copper contact rings on the rotor shaft. Power is supplied to them through two copper-graphite brushes. Terminal "67" of the brush holder is connected to terminal "67" of the voltage regulator, which is fixed to the left mudguard in the engine compartment.
Currently, an electronic voltage regulator 121.3702 is installed. It is non-separable and cannot be repaired.
Early production cars used the RR-380 electromechanical relay-regulator. The regulators are interchangeable, but the electronic one is preferable.
Attention! The "minus" of the battery must always be connected to the car body, and the "plus" - to the "30" terminal of the generator.
When the generator is running, do not disconnect the battery. This may damage the electronic components of the on-board network.
(The article is copied from the website: VAZbook.ru)
Maintenance of the generator consists of checking the tension of its drive belt (see Replacing the alternator drive belt).