Adjustment - MG MGA Twin Cam Workshop Manual

Fig. E.2 Compressing the springs with wood blocks and press. A spider securing nut is indicated by
the arrow
Cover assembly
Each release lever is pivoted on a floating pin (1), which remains stationary in the lever and rolls
across a short flat portion of the enlarged hole in the eyebolts (K). The outer ends of the eyebolts
extend through holes in the clutch cover and are fitted with adjusting nuts (H) by means of which each
lever is located in its correct position. The outer or shorter ends of the release levers engage the
pressure plate lugs by means of struts (1) which provide knife-edge contact between the outer ends of
the levers and the pressure plate lugs, eliminating friction at this point. Thus, the pressure plate (B) is
pulled away from the driven plate (c), compressing the six thrust coil springs (L) which are assembled
between the pressure plate and the clutch cover (A).
When the foot pressure is removed from the clutch pedal the clutch springs force the pressure plate
forward against the driven plate, gradually and smoothly applying the power of the engine to the rear
wheels.
Hydraulic operation
The clutch master cylinder, complete with integral reservoir, is bolted to the chassis frame adjacent to
the brake master cylinder. Depression of the clutch pedal causes the piston to move along the polish-
finished master cylinder bore. Fluid pressure is transmitted to a slave cylinder bolted to the clutch
housing, moving the piston, push-rod, and clutch lever and disengaging the clutch.
E.1 ADJUSTMENT
It is essential that there should be a clearance between the master cylinder push-rod and the piston
when the clutch pedal is released. This clearance, 1 in. (-8 mm.), is adjusted by slackening the
locknut and rotating the push-rod in the appropriate direction. Ensure that the pedal is not obstructed
by the toeboard or by the floor covering. The free movement at the pedal pad must be sufficient to
allow the piston to return fully in the cylinder and still retain the1/32 in. (.8 mm.) clearance at the
pushrod.
Excessive movement may indicate lack of fluid or the need for bleeding; whenever the system is
drained, bleeding will be required after refilling.
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