Withdrawal Mechanism

This mechanism consists of:

— a forked lever, integral with a shaft (passing through clutch housing) on which the outer operat­ing lever is keyed;

— a return spring, connected to outer operating lever and anchored on gearbox casing. When in normal position, this spring keeps the central thrust carbon ring away from withdrawal levers carrier ring. The carbon ring is pressed against carrier ring by the throwout ring connected to forked lever.

After adjustment, lock by nut and jam nut

clutch throwout mechanism

clutch controls and adjusting mechanism

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #6

The Clutch Drags.

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #5

If your Experiencing Excessive Facing Wear.

CLUTCH SPECIFICATIONS

(See Exploded Clutch View)

CLUTCH SERVICING INSTRUCTIONS

Removal and Installation.

This also frees the driven plate.

To install clutch on flywheel, use as a guide flywheel locating dowels.

Prior to tightening down clutch mounting screws, align driven plate.

(pic. installing the clutch on flywheel using pilot to center the driven plate)

Pilot Bushing.

Whenever clutch unit is disassembled, it is es­sential to check that pilot bush on crankshaft for,

- clutch shaft rear support

- is not damaged or ex­cessively worn.

Clutch shaft tang on bush end must also be found in good condition.

Max. clearance between clutch shaft tang and bush must not be greater than .0059" (0,15 mm), otherwise pilot bush must be replaced.

(pic. clutch assembly installed on engine)

Disassembly.

Unhook the withdrawal lever carrier ring springs and take out the ring.

Unscrew the withdrawal lever fixing nuts on bolts and remove the levers and washers; slacken gradually the three T-handles to relieve pressure of clutch springs.

Next, take off clutch cover, springs and lever mounting bolts.

(Pic.location dowels on flywheel for clutch centering)

Pressure Springs.

When servicing the clutch, always check springs for perfect efficiency. In case springs are exces­sively weak - i. e., the spring length of .9646 (24,5 mm), corresponding to the actual assembly value, is obtained with a load of less than 43 lbs (19,5 kg) - replace the springs.

(Pic. pressure spring specifications)

Withdrawal Lever Carrier Ring Retain­ing Springs.

The length of closed springs, under rated clutch load, is .7677' (19,5 mm), while the length of ex­panded springs (under a load of 4.85 .44 lbs -2,2 ± 0,2 kg) should be 1.1811" (30 mm). If an excessive weakening of springs is noticed, replace the springs.

(Pic. withdrawal lever carrier ring retaining spring specifications)

Withdrawal Levers.

Check the withdrawal levers and their bolts for excessive wear, and replace [More]

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #4

When The Clutch Slips

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #3

If you Experience Noises when Clutch Pedal is Released

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #2

If The Clutch Grabs

Lets learn a bit more about the Fiat 500 clucth. 

The clutch is a single disc design and incorporates a driven plate ( which carries the friction materials on each side) and a pressure plate and cover assembly. On early cars the pressure plate is tensioned by coil springs and the pressure is taken off by a central release ring linked to three release lever which pivot on the cover.

 The clutch operating lever pivots in the forward end of the gearbox casing and thrust bearing on the inner end bears on to the release ring when the arm is operated. The operating arm is moved by a cable from the [More]

CLUTCH TROUBLE DIAGNOSIS AND CORRECTIONS #1

If your Experiencing Noises When Clutch Pedal is Depressed