Chevrolet Silverado / GMC Sierra. Manual — part 1258

CLUTCH RATTLE

(M96) or Transmission Disassemble
for the Tremec 5-Speed (TZO).

Clutch pressure plate damaged

1. Inspect the pressure plate for bent drive

straps caused by improper vehicle use.

2. Replace the clutch assembly if the clutch

pressure plate is damaged. Inform the
customer. Refer to Clutch Assembly
Replacement.

Flywheel improperly machined

1. Inspect the flywheel for being machined,

and causing interference with the clutch
disc.

2. Replace the flywheel if it has been

machined. Refer to Engine Flywheel
Replacement for the 4.3L engine or
Automatic Transmission Flex Plate
Replacement for the 6.0L engine.

Flywheel uneven

1. Inspect the flywheel surface for being

warped or uneven.

2. Replace the flywheel if it is faulty.

Refer to Engine Flywheel
Replacement for the 4.3L engine or
Automatic Transmission Flex Plate
Replacement for the 6.0L engine.

Cause

Action

DEFINITION: A rattle noise coming from the clutch components with the clutch
disengaged or engaged.
Review the Symptoms - Clutch and perform the necessary inspections.
Idle rattle clutch engaged

Replace the clutch disc, due to faulty
dampener springs. Refer to Clutch Assembly
Replacement.

Clutch is improperly installed

Remove the clutch and install it correctly.
Refer to Clutch Assembly Replacement.

Clutch disc dampener worn or damaged

1. Inspect the clutch disc for a broken or

worn dampener.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

CLUTCH NOISY

CLUTCH PEDAL SPONGY LOW PEDAL EFFORT

2. Replace the clutch assembly. Refer to

Clutch Assembly Replacement.

Clutch disc splines and input shaft splines
worn

1. Inspect the clutch disc hub to input shaft

splines for excessive clearance.

2. Replace the clutch assembly if the clutch

splines are worn. Refer to Clutch
Assembly Replacement.

3. Replace the input shaft. Refer to

Transmission Disassemble for the
Tremec 5-Speed (M96) or
Transmission Disassemble for the
Tremec 5-Speed (TZO).

Cause

Action

DEFINITION: A growl or whine noise is coming from the clutch when engaged or
disengaged.
Review the Symptoms - Clutch and perform the necessary inspections.
Pilot bearing is worn or damaged

Replace the pilot bearing. Refer to Clutch
Pilot Bearing Replacement.

Release bearing damaged or worn

Replace the release bearing. Refer to Clutch
Actuator Cylinder Replacement (TZ0) or
Clutch Actuator Cylinder Replacement
(M96).

Cause

Action

DEFINITION: The clutch pedal may feel spongy, or it requires very little effort to operate.
Review Symptoms - Clutch and perform the necessary inspections.
Air in the hydraulic system

Bleed the clutch hydraulic system. Refer to
Hydraulic Clutch Bleeding.

Master cylinder fluid level low

1. Inspect for leakage in the clutch master

cylinder, hose connections, and the
clutch actuator.

2. Repair or replace any faulty

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

components.

Incomplete pedal return

1. Inspect the pedal for full return.

2. Clear any obstacles that may interfere

with the pedal operation.

3. Replace the clutch pedal return spring,

if equipped. Refer to Clutch Pedal
Replacement.

4. Faulty clutch start switch. Refer to

Clutch Pedal Engine Start Switch
Replacement.

Clutch incorrectly installed

Remove the clutch and install it correctly.
Refer to Clutch Assembly Replacement.

Clutch mounting bolts loose or broken

1. Remove the broken bolts.

2. Replace the broken or loose bolts and

tighten. Refer to Clutch Assembly
Replacement.

Release bearing worn or damaged

Replace the release bearing. Refer to Clutch
Actuator Cylinder Replacement (TZ0) or
Clutch Actuator Cylinder Replacement
(M96).

Contaminated hydraulic fluid

1. Inspect the clutch hydraulic fluid for

contamination of water. If available, use
a brake fluid boiling point tester.
Boiling point should be above 177°C
(350°F).

2. Inspect the reservoir cap for being faulty

if water is present.

3. Inspect the clutch hydraulic fluid for dirt

or debris.

4. Flush and bleed the clutch hydraulic

system if the above conditions are
found. Refer to Hydraulic Clutch
Bleeding.

5. If mineral oil was added, replace the

clutch master cylinder and clutch
actuator cylinder due to seal damage.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

CLUTCH PEDAL HARD TO PUSH

Refer to Clutch Master Cylinder
Replacement and Clutch Actuator
Cylinder Replacement (TZ0) or
Clutch Actuator Cylinder
Replacement (M96).

Cause

Action

DEFINITION: The clutch pedal requires high effort to operate.
Review the Symptoms - Clutch and perform the necessary inspections.
Incorrect hydraulic fluid

1. Inspect for the correct fluid in the

master cylinder. Refer to Hydraulic
Clutch Bleeding.

2. Replace the clutch master cylinder and

clutch actuator cylinder. Refer to
Clutch Master Cylinder
Replacement and Clutch Actuator
Cylinder Replacement (TZ0) or
Clutch Actuator Cylinder
Replacement (M96).

3. Flush the hydraulic system and fill with

the correct fluid.

Contaminated hydraulic fluid

1. Inspect the hydraulic fluid for water.

2. Inspect the hydraulic fluid for dirt or

debris.

3. Flush the hydraulic system and fill with

the correct fluid. Refer to Hydraulic
Clutch Bleeding.

Clutch pedal binding

1. Inspect the pedal for binding.

2. Repair or replace the pedal. Refer to

Clutch Pedal Replacement.

Kinked or damaged clutch hydraulic pipe

1. Inspect for a kinked or damaged

hydraulic hose.

2. Repair or replace the clutch hydraulic

hose. Refer to Clutch Master Cylinder

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado