Clutch components - removal, inspection and refitting

Clutch / Clutch components - removal, inspection and refitting

Removal
1 Remove the transmission as described in Chapter 7.

2 Mark the position of the pressure plate cover with respect to the flywheel, to ensure correct alignment on refitting.

3 Using an Allen key or hex bit, unscrew the pressure plate bolts progressively in a diagonal sequence (see illustration). If necessary, prevent the flywheel from rotating by inserting a screwdriver between the starter ring gear teeth and the cylinder block.

4.3 Removing the pressure plate bolts

4 Withdraw the pressure plate assembly and the driven plate from the flywheel. Note that one side of the pressure plate hub houses the torsional damping springs and protrudes by a greater amount - this side faces the pressure plate.

5 Check the condition of the clutch components as described in the following sub-Section.

Inspection
6 Examine the surfaces of the pressure plate and flywheel for signs of heavy scoring. Light scoring is normal, but if excessive the pressure plate must be renewed and the flywheel either machined or renewed.

7 Inspect the ends of the pressure plate diaphragm spring fingers; look for wear caused by contact with the release bearing. If the scoring appears excessive, renew the assembly.

8 Using a straight edge and feeler blade, check that the inward taper of the pressure plate does not exceed the maximum amount given in the Specifications (see illustration).

Also check for loose riveted joints and for any cracks in the pressure plate components.

4.8 Checking the clutch pressure plate for taper

9 Check the driven plate linings for wear; renew the plate if the linings are worn to within 1.0 mm (0.04in) of the lining material securing rivets.

10 Check that the driven plate damper springs and all rivets are secure, and that the linings are not contaminated with oil.

Temporarily fit the disc to the transmission input shaft and check that the run-out does not exceed that given in the Specifications.

11 If the clutch components are contaminated with oil, the leak should be found and rectified. The procedure for renewing the crankshaft oil seal is described in Chapter 2A; the procedure for renewing the transmission input shaft oil seal is described in Chapter 7.

12 Having checked the clutch disc and pressure plate, check the release bearing with reference to Section 7.

Refitting
13 Before commencing the refitting procedure, a tool must be obtained for aligning the driven plate, otherwise difficulty will be experienced when refitting the transmission. If the driven plate is not aligned centrally before the pressure plate is fitted, it will not be possible to engage the transmission input shaft with it. If a centralising tool is not available, a wooden mandrel may be made to the dimensions shown (see illustration).

4.13 Clutch driven plate centralising tool dimensions

A 18.24 mm
B 70.0mm
C 20.0mm
D 14.81 mm

14 Clean the friction faces of the flywheel and pressure plate, then fit the centralising tool to the crankshaft and locate the driven plate on it with the hub extension facing outwards (see illustration).

4.14 Driven plate fitted with centralising tool in place

15 Fit the pressure plate assembly to the flywheel (using the alignment marks made during removal, if the original component is being refitted). Ensure that the friction surface lies flat against the driven plate, then insert the retaining bolts and tighten them progressively in diagonal sequence to the specified torque (see illustration).

4.15 Fitting the pressure plete assembly

16 Refit the transmission as described in Chapter 7, then reconnect the clutch cable as described in Section 2.