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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
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