A three-phase generator produces three-phase alternating current. Since the battery must be charged with direct current, powerful diodes convert the alternating current into direct current.
The rectifiers also prevent the battery from draining when parked. The generator is virtually maintenance free. You can independently replace the generator brushes after a run of 100,000 km. In the event of a serious malfunction, return the generator for repair.
Attaching the B+ wire to the generator
Pic. 7.7. B+ wire fixing nut
The tightening torque for the fixing nut of the B+ wire is in the table «Tightening torques» (pic. 7.7).
Attention: If the B+ wire is fastened with the wrong tightening torque, the following risks exist:
Attention: – the battery will not be fully charged.
Attention: – failure of electric equipment and electronics of the car can occur.
Attention: – there is a risk of fire due to possible sparking and damage to electronic components and control units due to overvoltage.
Poly V-belt check
Turn the engine at the vibration damper/belt pulley with a socket wrench.
Check the V-ribbed belt for the following damage:
- carrier layer breaks (tears, breaks in the middle, transverse breaks);
- peeling layers (top layer, work surface);
- torn parts of the carrier layer;
- wear of the working surface;
- edge wear (material wear, frayed/pulled edges, hardened edges, cracked edges);
- traces of oil and grease.
Attention: In case of defects, be sure to replace the V-ribbed belt. In this way, possible malfunctions and failure of some functions can be prevented.
V-ribbed belt travel, 1.6l injection engine
Pic. 7.8. Vehicles without air conditioning: 1 - tension roller; 2 - V-belt drive pulley - three-phase generator; 3 - V-ribbed belt; 4 - V-belt pulley - crankshaft
Pic. 7.9. Cars with air conditioning: 1 - tension roller; 2 - V-belt drive pulley - three-phase generator; 3 - poly V-belt pulley - air conditioning compressor; 4 – V-ribbed belt; 5 - V-belt pulley - crankshaft
Poly V-belt travel, 1.6l FSI engine
Pic. 7.10. Vehicles without air conditioning: 1 - V-belt pulley - cooling system pump; 2 - tension roller; 3 - V-belt drive pulley - three-phase generator; 4 – V-ribbed belt; 5 - V-belt pulley - crankshaft
Pic. 7.11. Cars with air conditioning: 1 - V-belt pulley - cooling system pump; 2 - bypass roller; 3 - V-belt drive pulley - three-phase generator; 4 - tension roller; 5 - poly V-belt pulley - air conditioning compressor; 6 – V-ribbed belt; 7 - V-belt pulley - crankshaft
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