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
1111 Engine Block
11 11 ENGINE BLOCK - TIGHTENING TORQUE SPECIFICATIONS
| Type | Thread | Tightening specifications | Dimension | |
|---|---|---|---|---|
| 1AZ Bearing frame to crankcase upper part | W20 | Replace all bolts. | ||
| M9x1.25 | 1. Joining torque | 3 Nm | ||
| M6x60 | 2. Joining torque | 3 Nm | ||
| M9x1.25 | 3. Joining torque | 18 Nm | ||
| M6x60 | 4. Joining torque | 10 Nm | ||
| M9x1.25 | 5. Angle of rotation | 90° | ||
| 2AZ Oil spray nozzles to engine block | W20 | M6x16 | 10 Nm | |
| 3AZ Crankcase lower section to crankcase upper part | W20 | M8x50 | 23 Nm | |
| 4AZ Oil cooler connection to crankcase lower section | W20 | 35 Nm | ||
| 5AZ Oil drain plug to crankcase lower section | W20 | M16x1.5 | Replace the sealing ring. | 28 Nm |
| 6AZ Oil filter element to crankcase lower section | W20 | 11 Nm | ||
| 7AZ Oil drain plug on lower part of the crankcase | W20 | M12x1.5 | Coat the screw with Loctite 360°. | 11 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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