Clutch Pedal - Squeak Noise
File in Section: 7 - TransmissionBulletin No.: 56-73-01
Date: February, 1995
SUBJECT:
Clutch Pedal Squeak Noise (Install Greaseable Ball Stud)
MODELS:
1994-95 Chevrolet and GMC Truck C/K 1, 2 and S/T Models
with NV3500 5-Speed Manual Transmission (RPOs MG5, MY2, M50)
CONDITION
A squeak noise may come from the clutch area when the clutch pedal is fully released (foot off the clutch pedal) and the engine is running. This squeak will stop when slight pressure is placed on the clutch pedal. This noise may be confused with a squeaking or noisy clutch release bearing.
CAUSE
This noise is usually caused by a dry clutch fork ball stud which causes metal to metal contact with the clutch fork. The grease fitting was removed in production for the 1994 and 1995 model years so the joint is no longer greaseable.
CORRECTION
Install a greaseable ball stud.
Service Procedure
1. Remove the transmission following directions in the appropriate Service Manual, Section 7B, Manual Transmission.
2. Remove the clutch fork and ball stud from the front transmission housing using J 36510, clutch fork pivot remover/installer (Figure 1).
3. Inspect the front transmission housing to locate the raised boss where the grease zerk is to be installed (Figure 2).
^ The boss is on the right side of the transmission between the fill plug and the clutch fork pocket.
4. Drill a hole of required size (determined by diameter/thread pitch of zerk used) in the center of the raised boss located in step 3.
^ The grease zerk used should have no more than 1/4" of threaded length to avoid entering the ball stud cavity.
Important:
Wall thickness in this area is approximately 1/4". Use caution to prevent passing through the ball stud cavity and drilling through the inner wall of the housing.
5. Tap the hole as required and install the grease zerk.
Important:
Thoroughly clean out all metal chips before installing the zerk and ball stud to prevent plugging the greaseable ball stud.
6. Install greaseable ball stud P/N 23049797 using J 36510, clutch fork pivot remover/installer.
7. Grease the fitting until a small amount of grease flows from the end of the ball stud.
8. Install new clutch fork P/N 15588262. Place grease in the clutch fork pocket that contacts the clutch fork push rod.
9. Reinstall the transmission following directions in the appropriate Service Manual, Section 7B, Manual Transmission.
10. Grease the assembled ball stud lightly through the fining. Grease every 30,000 miles thereafter.
Important:
Grease should be added "sparingly" to the fitting. Excessive grease can contaminate the clutch disc friction surfaces resulting in slip or chatter and the need to replace the disc.
PARTS INFORMATION
Parts are currently available from GMPSO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor
Operation Description Labor Time
K0720 Fork and/or Ball Use published labor
Stud, Clutch operation time
Release - Replace
The document shown should be reproduced locally and provided to the owners of the vehicles modified by this procedure.