Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 BMW i3 Range ExtenderFACTORY OEM SERVICE PROCEDURE
1237 Electrical Machine, Individual Components
1237 TIGHTENING TORQUE OVERVIEW
| Brush module lid to housing | ||
| M8 | Tightening torque | 15 Nm |
| Angle of rotation | 90° | |
| Brush module lid to housing | ||
| M6 | Tightening torque | 8 Nm |
| Angle of rotation | 60° | |
| Brush module to housing | ||
| M6 | Tightening torque | 8 Nm |
| Circlip on housing | ||
| M5 Replace screw. |
Tightening torque | 4.5 Nm |
| Circlip to housing | ||
| M5 Replace screw. |
Tightening torque | 4 Nm |
| Excitation cable to brush module | ||
| M5 | Tightening torque | 4 Nm |
| Lid of electrical machine electronics to housing | ||
| M6 Replace screw. |
Tightening torque | 8 Nm |
| Angle of rotation | 60° | |
| Lid of high-voltage connection to housing | ||
| M5 | Tightening torque | 6 Nm |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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