90 A - Bosch version with poly V-belt drive — AUDI

🧭 Before you start

• Renewed: bearing

Don't miss

• Counterhold with hexagon socket bolt
• When installing, press ball bearing through inside ring up to stop.Always use new bearing.

📋 Procedure

1. Tighten threaded connections to specified torque settings (see the separate procedure).
2. Counterhold with hexagon socket bolt
3. Tighten threaded connections to specified torque settings (see the separate procedure). [Note: When installing, press ball bearing through inside ring up to stop. Always use new bearing.]
4. Use needle nose pliers to dissipate heat at the soldering points (arrow).
5. Use radio solder and max. 300 W soldering iron.

6. Desolder stator windings.
7. Press button for resistance measurement on hand multimeter V.A.G 1526 B.
8. Route measuring lines consecutively to measuring points at 1 and 2; 1 and 3; 1 and 4; 1 and 5.
9. Press button for resistance measurement on hand multimeter V.A.G 1526 B.
10. Route measuring lines consecutively to winding ends at 1 and 2; 1 and 3; 1 and 4; 2 and 3; 2 and 4; 3 and 4.
11. Press button for resistance measurement on hand multimeter V.A.G 1526 B.
12. Press button for resistance measurement on hand multimeter V.A.G 1526 B.
13. Simultaneously press buttons for resistance and voltage measurement on hand multimeter V.A.G 1526 B.
14. Check positive diodes: consecutively connect black terminal to positive heat sink (1) (corresponds to B+) and red terminal to collective points (2).
15. Check negative diodes: consecutively red terminal to negative heat sink (3) and black terminal to collective points (2).
16. Check exciter diodes: consecutively black terminal to contact rail (4) (corresponds to D+) and red terminal to collective points (2).

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Removing and installing track rod · 3 torque figures
• Removing and installing fuel tank shut-off valve – Audi A3 · 1 torque figures
• Removing and installing fuel tank - vehicles with front-wheel drive
• Removing gearbox (vehicles with 2.0 ltr. TDI engine) – Audi A1
• Dismantling and assembling gearbox (version with circlip (A) for input shaft sealing cap)