Note. If you remove the pulley hub, then during installation it is necessary to replace the mounting bolt. You will also need a torque wrench capable of generating a torque of 410 Nm.
Withdrawal
1. Remove the crankcase protection from under the engine.
2. Remove the cooling fan with shroud (see chapter 3).
3. Remove the accessory drive belts as directed in chapter 1.
4. Two different designs of pulleys can be installed on different models. On some models, the damper pulley is screwed to the hub (collapsible design). On others, the pulley with the hub is a single unit (non-separable construction).
Damper pulley and hub - collapsible design
5. Turn out bolts of fastening of a pulley to a nave and remove a pulley with a damper (pic. 5.5).
6. To remove the hub, unscrew the central bolt.
Attention! The hub bolt is very tight. To prevent the shaft from turning, it must be securely held. Do not attempt to loosen the bolt using an unsuitable or defective tool.
7. Make a tool to hold the shaft while loosening the bolt. Take two steel strips and connect them with a large U-shaped bolt. Screw the ends of the fixture to the hub with the pulley bolts. If you can get a branded tool, use it (pic. 5.7),
8. Loosen the hub bolt. Remember that it is very tight.
9. Turn out a bolt and remove a washer (pic. 5.9). The bolt can be discarded - it must be replaced when installed.
10. Remove the hub from the toe of the shaft (pic. 5.10). If the hub cannot be removed by hand, use a puller.
11. If the key does not fit well in the shaft slot, remove it and save it.
Damper pulley and hub - non-separable design
12. To keep the hub from turning, the manufacturer recommends using BMW tools 11 8190 and 11 8 200. If there is no branded tool, you can try to hold the shaft by grabbing the hub with a chain or belt wrench for oil filters (pic. 5.12, a, b). The bolt is very tight and you may need an assistant.
13. Turn out a bolt of a pulley and remove a washer. The bolt can be thrown away - a new one is required for installation.
14. Remove the hub from the nose of the crankshaft. If the hub cannot be removed by hand, use a puller.
15. If the key does not hold well on the toe of the shaft, remove it as well.
Installation
16. If the hub is removed from the shaft, take the opportunity and replace the front crankshaft seal. The cuff is located in the timing chain cover (see paragraph 6).
17. If the hub was removed, continue with the next step, otherwise go to step 21 (for separate pulley and hub).
18. Insert the key into the groove of the crankshaft (if she was removed from there), then slide the hub onto the shaft, aligning the groove in the hub with the key.
19. Put the washer on the new bolt. The lug of the washer must face the hub.
Damper pulley and hub - collapsible design
20. Screw the retainer to the hub. as for removal, and tighten the hub bolt to the specified torque.
21. Turn away bolts of fastening of the stop device and establish a pulley with a damper on a nave. The dowel pin in the hub must fit into the corresponding hole in the pulley.
22. Screw in bolts of fastening of a pulley and tighten them the demanded moment.
Damper pulley and hub - non-separable design
23. Tighten the central bolt to the required torque.
All models
24. Install the accessory drive belts as indicated in chapter 1.
25. Install the cooling fan with shroud (see chapter 3).
26. Install the crankcase under the engine.