1. Gather Tools and Parts:
- 10mm socket wrench
- 13mm socket wrench
- Set of Allen keys
- Torque wrench
- New serpentine belt (refer to your vehicle's manual for the specific type required)
2. Locate Serpentine Belt:
- Open the bonnet (hood) of your BMW 320d.
- Locate the serpentine belt. It's usually routed around several engine components, such as the alternator, power steering pump, water pump, and air conditioning compressor.
3. Release Belt Tension:
- Use the 10mm socket wrench to loosen the bolt that adjusts the tensioner pulley.
- Once the tension is released, the belt will become loose and you can remove it.
4. Remove Old Belt:
- With the belt loosened, remove it by pulling it off the pulleys and engine components.
5. Install New Belt:
- Align the new belt with the pulleys and components, following the routing diagram in your vehicle's manual.
- Apply some tension by turning the tensioner pulley using the 10mm socket wrench.
- Ensure that the belt is seated properly on all the pulleys.
6. Tighten Belt Tension:
- Use the torque wrench with the 13mm socket to tighten the tensioner pulley bolt according to the manufacturer's specified torque value. This is important to achieve the proper belt tension.
7. Reinstall Belt Covers:
- If there were any covers or panels removed during the process, reinstall them securely.
8. Test the Belt:
- Start the engine and let it run for a few minutes.
- Listen for any unusual noises or vibrations.
- Turn the steering wheel from lock to lock to ensure that the power steering is functioning properly.
- Check if the air conditioning is blowing cold air.
Before performing any maintenance work on your BMW, always refer to the vehicle's service manual for specific instructions and safety precautions. If you're not comfortable performing these steps yourself, it's best to seek assistance from a qualified mechanic or an authorized BMW service center.
