PRESSURE PLATE AND COVER
Inspect the surface of the pressure plate for burn marks, scores, or ridges. Generally, pressure plate resurfacing is not recommended. However, minor burn marks, scores, or ridges may be removed. During the re-surfacing process, the flatness of the pressure plate must be maintained. If the pressure plate is badly heat-checked or deeply scored, replace the pressure plate and cover assembly. Clean the pressure plate and flywheel surfaces with a suitable solvent to be sure the surfaces are free from any oil film. Do not use cleaners with petroleum base, and do not immerse the pressure plate in the solvent.
Place the plate on the floor, being careful not to score or scratch the surface. Force each individual finger down, then release it quickly. If the finger does not return quickly, a binding condition is indicated, and the pressure plate should be replaced.
The pressure plate should be lubricated with lithium base grease between the driving lugs and the edges of the pressure plate openings as shown in Fig. 6. Depress the pressure plate fingers fully, apply the lubricant, and then move the fingers up and down until the lubricant is worked in. Do not apply excessive lubricant.
CLUTCH DISC
Inspect the clutch disc facings for oil or grease. Eliminate the source of any oil or grease before replacing the disc. An excessive amount of grease in the pilot bushing or release bearing hub will find its way to the disc facings. Too much lubricant in the gearbox or a plugged vent will force the lubricant out of the input shaft and onto the disc facings.
Inspect the clutch disc for worn or loose facings. Check the disc for distortion and for loose rivets at the hub. Check for broken springs. Springs loose enough to rattle will not cause noise when the car is operating.
Replace the disc assembly if any of these defects are present.
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Be especially careful when installing a new disc to avoid dropping it or contaminating it with oil or grease.
PILOT BUSHING
Check the fit of the clutch pilot bushing in the bore of the crankshaft.
The bushing is pressed into the crankshaft and should not be loose. Inspect the inner surface of the bushing for wear or a bell-mouthed condition. If the bushing is worn or damaged, replace the bushing with a new service bearing. Refer to the engine section for the replacement procedure.
MASTER CYLINDER
Description (Fig. 7.)
The fluid reservoir is cast integrally with the cylinder body, and is connected with it by a hole opening into the centre of the end of the pressure cylinder. The fate is machined to seat the small centre valve seal.
When pressure is applied to the push rod the plunger with its seal moves down the polished bore of the cylinder. The centre valve moves initially by a spring on to Its seating and is retained by the fluid whilst the pressure is transmitted through the pipe-line to the withdrawal lever. On the return of the plunger to its fully retracted position the centre valve is positively retained off its seating by the pressure of the returning fluid and free movement of the fluid between reservoir and pipeline is assured.
To remove
Disconnect the pressure pipe (I) from the cylinder barrel, and the clevis pin (16), from the clutch pedal. Compress the pedal return spring (12) and slide out the slotted spring cap (13). Remove the fixing bolts and detach the cylinder with push rod and flange spacer. Unscrew the filler cap and drain the fluid into a clean container.
To dismantle (Fig. 7.)
Pull back the rubber dust cover and remove the circlip (11) with a pair of long nosed pliers. The push rod and dished washer can then be removed. When the push rod has been removed the plunger (10) with seals attached will then be exposed. The plunger may, or may not have the second seal fitted. In either case, refit as found, when dismantled.
Remove the plunger assembly complete. The assembly can then be separated by lifting the thimble leaf (9) over the shouldered end of the plunger. The seals should be eased off the plunger.
Depress the plunger return spring, allowing the valve stem (7) to slide through the elongated hole of thimble (9), thus releasing the tension of the spring. Remove thimble, spring and valve complete.
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