Shift Up with Clutch Troubleshooting
Written July, 2023
Clutch Slippage | Probable Cause | Correction |
| Lack of free pedal | Re-adjust per instructions |
| Release mechanism binding | Check release mechanism and linkage; lube if necessary |
| Grease or oil on clutch facings | Replace with new clutch assembly, find and repair cause of grease or oil contamination |
| Worn clutch facings | Replace with new clutch assembly |
| Weak pressure springs | Replace with new clutch assembly |
| Overloaded clutch | Review application to ensure that proper clutch was installed |
Noisy Clutch | Probable Cause | Correction |
| Clutch release bearing lacks lubricant or damaged | Lubricate if a zerk fitting or replace clutch assembly |
| Flywheel pilot bearing lacks lubricant or damaged | Lubricate or replace with new bearings |
| Clutch release bearing housing hitting flywheel ring | Adjust clutch per instructions; check wear on cross shafts, bell housing bushings and release yoke; replace if necessary |
| Wrong tolerances between drive slots and drive lugs on pressure plates | Clearance should be no less than 006” |
Poor Clutch Release | Probable Cause | Correction |
| Clutch adjustment not correct | Re-check adjustment per instructions |
| Flywheel pilot bearing bound in flywheel or on input shaft | Replace pilot bearing and ensure proper seating in flywheel and tolerance to input shaft |
| Damaged clutch release bearing | Replace with new clutch assembly |
| Clutch release shaft projecting through release yoke | Reposition release shaft so it does not project; check bell housing bushings, cross shafts and release yoke for wear |
| Release yoke hitting cover assembly at full release position | Replace release yoke with proper yoke |
| Release yoke not aligned properly with release bearing | Check flywheel has not been resurfaced more than the 060” maximum |
| Intermediate plate sticking on drive lugs (14” angle spring — 2 plate assemblies only) | Check drive pins are 90° to flywheel surface and minimum 006” clearance between drive pins & center plate slots |
| Pressure plate not retracting fully | Check pressure plate drive lugs for 006” clearance |
| Worn splines on input shaft of transmission | Replace input shaft and check disc hubs for excess wear |
| Disc facings contaminated with oil or grease | Cleaning disc is not effective; check for leak causing contamination; replace clutch assembly |
