1993 Mustang

Section 08-00: Clutch System—Service

1993 Mustang Workshop Manual

DIAGNOSIS

Clutch System—Service

CLUTCH DIAGNOSIS
Condition	Possible Source	Action
Chirp or Squeak When Pedal is Up	Insufficient preload on release bearing.	Service or replace linkage parts (cable, release lever, tension spring, pedal assembly). Lubricate with Premium Long-Life Grease C1AZ-19590-E (ESA-M1C75-B) all linkage pivot points.
	Scrubbing of unlubricated release lever pivot due to out-of-plane pressure plate fingers.	Lubricate all pivot points. Tighten pressure plate mounting bolts. Refer to Section 08-01.
Clutch Chatters During Engagement	Loose engine mounts and number 3 crossmember mounting.	Service as required. Refer to Section 02-03.
	Oil on clutch disc. Burned or glazed.	Correct leak and install new clutch disc. Refer to Section 08-01.
Clutch is Noisy When Pedal is Depressed, Noise Continues as Long as the Pedal is Held Down	Damaged release bearing.	Remove transmission and replace release bearing. Inspect the release fingers and replace the pressure plate assembly as required.
	Flywheel housing out of alignment.	Check flywheel housing to engine crankshaft alignment. Replace housing if necessary.
	Improper engagement between transmission pilot and flywheel housing.	Check for proper pilot engagement into flywheel housing. Service or replace as required.
Clutch Does Not Disengage Properly	Cable release linkage outside flywheel housing worn, cracked, bent or hydraulic control malfunctioning.	Service or replace linkage parts as required. Refer to Section 08-02.
	Damaged internal components.	Remove transmission. Verify torque of pressure plate bolts. Check for damaged or worn clutch, pressure plate, release bearing, release lever or release lever pilot. Check for warped or contaminated clutch disc. Check engine crankshaft pilot bearing for lack of lubrication, damage or binding condition with input shaft. Check clutch disc hub spline for free movement on input shaft spline—lubricate. Service or replace as required.
Vehicle Will Not Start With Clutch Pedal Fully Depressed	Improper adjustment of interlock switch, damaged switch, or open or short circuited wiring.	Refer to Section 08-02 for diagnosis and service.
Clutch Slips After Pedal is Fully Released	Cable release linkage binding.	Lubricate. Service or replace linkage parts as required. Refer to Section 08-02.
	Damaged internal components.	Remove transmission. Service or replace release lever, release bearing, transmission input shaft bearing retainer. Check pressure plate and clutch disc for wear and contamination. Replace as required.
Clutch "Squeaks" or "Scrubs" When Pedal is in Motion	Cable release linkage and/or cable—lack of lubrication, binding, interference, worn or kinked.	Lubricate linkage, service or replace as required. Replace clutch cable. Do not lubricate cable.
	Lack of lubrication on the clutch release lever pivot and lever to release bearing contact.	Remove transmission and release bearing. Lubricate accordingly.
	Lack of lubrication in the clutch release bearing bore and the transmission bearing retainer.	Lubricate accordingly.
	Flywheel housing out of alignment.	Check alignment after ascertaining that housing is properly positioned on dowels, and attaching bolts are properly tightened. Replace housing if necessary.
Clicking Noise When Depressing Clutch Pedal	Clutch interlock switch.	Inspect interlock switch for binding or excessive noise. Replace switch if necessary.
	Self adjuster ratchet noise (cable linkage only).	Check Section 08-02 for corrective actions.
	Speed control switch.	Check for corrective actions.

RELEASE BEARING NOISE

A1 DEPRESS CLUTCH PEDAL

Chirp, squeak or clatter with the clutch pedal up can be caused by insufficient bearing pre-load, out-of-plane pressure plate fingers, transmission, or a worn or damaged release bearing.

With engine idling, depress the clutch pedal to the floor.

Is noise still present?

Yes
REPLACE worn or damaged release bearing.

No
GO to A2 .

A2 DISENGAGE BEARING FROM PRESSURE PLATE

With engine idling, disconnect clutch cable from the release lever or bellcrank and move the lever away from the cable or upper end of bellcrank toward engine, to disengage bearing from pressure plate fingers.

Is noise still present?

Yes
Noise is from the transmission. REFER to Section 07-03 for Transmission Diagnosis.

No
GO to A3 .

A3 PRE-LOAD BEARING
NOTE: Binding release lever will reduce bearing pre-load, resulting in possible scrubbing between pressure plate fingers and bearing face. Out-of-plane fingers will cause oscillation of the release lever, resulting in noise if the pivot is dry. The lever plane is affected by pressure plate mounting bolt torque. Be sure the bolts are tightened to specification.

With engine idling, apply a five-pound load to the release lever at the cable junction in direction of applied force to pre-load the bearing.

Is noise still present?

Yes
The release lever is binding. LUBE release lever pivot. and FREE UP release bearing hub to slide freely on release bearing guide.

No
Clutch control system worn or damaged. SERVICE or REPLACE as necessary any sticky or binding clutch control components.