Attention! Dust generated by worn clutch linings may contain asbestos, which is hazardous to health. Do not blow compressed air through clutch components or inhale this air. Do not use gasoline (or mineral-based solvents) to clean the clutch from dust. Use only brake cleaners or methanol to clean clutch components. After cleaning the clutch components with a rag, throw the rag into a special container with an airtight lid.
Note. If you are going to reinstall the pressure plate. You will need BMW 212 170 to compress the diaphragm spring before installing the clutch cover. You may need special tool 212 142 to center the disc.
Withdrawal
1. Remove the gearbox (see chapter 7A).
2. If you are planning to reinstall the clutch assembly, mark the position of the clutch cover relative to the flywheel to make it easier to reinstall the assembly in the same position.
3. If you plan to reinstall the pressure plate, insert the three tabs of the tool (№21 2 170) into the openings of the casing in the area of the location of the adjusting springs (pic. 2.3). Screw in the knurled ring of the finger retainer. then screw in the tool shaft and compress the diaphragm spring.
4. Regardless of whether you will change the pressure plate or not, gradually unscrew the bolts securing the clutch housing to the flywheel and remove the washers (if they exist).
5. Remove the casing from the flywheel. Be prepared to support the clutch disc which may fall when the cover is removed. Pay attention to the location of the slave drive. The disc usually has signatures "Engine side" ("To the engine") And "Transmission side" ("To transmission") The longer side of the disc hub should face away from the flywheel.
Examination
6. After removing the clutch assembly, clean it of dust with a dry cloth. While most clutch discs use asbestos-free linings, some linings may still contain asbestos, so precautions must be taken. Asbestos dust is hazardous to health and should not be inhaled.
7. Inspect the surfaces of the driven disk and make sure that there is no excessive wear on the pads or damage to the rivets. Make sure the disc is not warped, damaged or worn. The surface of the pads may have small shiny spots. If there are traces of oil on the disc (having the appearance of black spots), the disc needs to be replaced. The location of the oil leak must be located and repaired before the clutch assembly is reinstalled. Usually, oil can leak through the rear crankshaft seal or through the gearbox input shaft seal (or through both cuffs). The replacement of these cuffs is described in the relevant part chapter 2 and in chapter 7A. The driven disk must also be replaced if the pads are excessively worn or the distance from the surface of the pads to the rivet heads is less than the minimum allowable (see technical data).
8. Inspect the surfaces of the flywheel and pressure plate. If they have scratches or large chips, replace them. The pressure plate must also be replaced if the diaphragm spring is cracked or broken.
9. Inspect the release bearing (see paragraph 3).
10. Inspect the crankshaft centering bearing. The bearing must rotate smoothly and silently. If the bearing surface that contacts the gearbox input shaft is damaged or worn, replace the bearing (see relevant part of chapter 2).
Installation
11. If you install new parts of the clutch assembly, clean them of preservatives.
12. It is very important to prevent oil or dirt from getting on the surface of the clutch plate, as well as on the working surfaces of the flywheel and pressure plate. Install the clutch assembly only with clean hands; Wipe the flywheel and pressure plate with clean rags.
13. Apply some grease containing molybdenum disulphide to the splines of the driven disc, then place the disc against the flywheel with the larger side of the hub facing away from the flywheel (most discs have inscriptions "To the engine" or "To transmission") (pic. 2.13.a). Center the driven disc on the flywheel using BMW tool #212 170. If you do not have this device, make a homemade device (pic. 2.13.b).
14. If you are reinstalling an old pressure plate or casing, align the pins of BMW #212 170 with the casing (if you removed this device) and compress the diaphragm spring as described in step 3. Use a screwdriver to reset the automatic clutch adjustment mechanism. To do this, move the pushers of the device counterclockwise to the stop, slightly loosening the force of the device. After the adjusting ring is set to its initial position, compress the diaphragm spring again with the tool and insert temporary stops between the tool pushers and the clutch cover. Please note that there is a special BMW tool for setting the mechanism to its initial position (pic. 2.14, a-c).
15. Install the clutch assembly in place, aligning the marks on the casing and flywheel. In this case, the casing should fit on the flywheel pins (pic. 2.15). Insert the bolts with washers and tighten them to the required torque.
16. If you are installing a new shroud, insert a 14mm hex wrench into the center of the diaphragm spring retainer and turn it clockwise to release the spring.
17. If you are installing an old casing, remove the diaphragm spring compressor. Remove the bushings with which the pushers of the clutch adjustment mechanism were fixed (pic. 2.17).
Caution: After removing the last retainer, the ring of the mechanism may turn abruptly. Keep your hands away from the adjustment mechanism.
18. Remove the driven disc centering tool. To do this, screw a bolt with a diameter of 10 mm into the fixture and remove the fixture using pliers (pic. 2.18).
19. Reinstall the gearbox (see chapter 7A).