Calais V6-3300 3.3L MFI VIN N (1990)
Pressure Plate: Customer Interest
M/T - Clutch Slippage Diagnosis
SUBJECT
MANUAL TRANSMISSION CLUTCH SLIPPAGE
(DIAGNOSIS)
MODELS/YEARS
1989-90 CUTLASS CALAIS AND CUTLASS SUPREME
MODELS EQUIPPED WITH MANUAL TRANSAXLE
NUMBER:
90-T-138
CORP.REF.NO: 037302R
DATE:
JULY 1990
SECTION:
7C
CONDITION:
Some owners of the above vehicles equipped with manual transmission may comment about difficult shift effort or gear clash in all gears with the clutch
pedal fully depressed.
CAUSE:
This reduced clutch disengagement may be the result of the clutch pressure plate cover to flywheel bolts working loose.
CORRECTION:
In order to assist diagnosis and repair, it is suggested that the following diagnostic procedures be used:
A.
Prior to removing the pressure plate, check for obvious hydraulic system leaks. Inspect the hydraulic linkage for any cracks, leaks, or loose
mounting flange bolts. Check the fluid level in the master cylinder reservoir. A low level may indicate a system leak or an under filled condition.
IMPORTANT:
Slight dampness under the clutch master cylinder boot, slave cylinder, or tube fitting do not necessarily indicate a leaking
condition, as there is a silicon lubricant present on the hydraulic clutch assembly.
If the hydraulic system does not show signs of leakage and the fluid level is correct, then the source of the clutch condition is located within the clutch
housing and is most likely a reduction of pressure plate bolt torque.
B.
Access the pressure plate bolts and check for looseness. If the bolts are not torqued properly, they should be removed ONE-AT-A-TIME,
inspected for damage, and reinstalled. When reinstalling the original or new clutch cover bolts (P/N 14004016), the torque should be 20 N-m (14.7
lbs.ft.) plus 30 degrees and a lock washer (P/N 11500191) should be installed with each bolt. Reference Section 7C of the applicable Service
Manual for specific clutch installation, removal, and inspection instructions.
Parts are currently available from G.M.S.P.O.
Use applicable labor operation and time.
