Chevrolet Full-size Cars 1968-1978 Repair Guide

Linkage Maintenance

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CLUTCH CROSS-SHAFT LUBRICATION



Once every 36,000 miles or sooner if necessary, remove the plug, install a fitting and lubricate with water resistant EP (Extreme Pressure) chassis lubricant.

LINKAGE INSPECTION



A clutch may have all the symptoms of going bad when the real trouble lies in the linkage. To avoid the unnecessary replacement of a clutch, make the following linkage checks:

  1. Start the engine and depress the clutch pedal until it is about 1 / 2 in. from the floor mat and move the shift lever between 1st and reverse (1st and 2nd on a 4-speed) several times. If this can be done smoothly without any grinding, the clutch is releasing fully. If the shifting is not smooth, the clutch is not releasing fully and adjustment is necessary.
  2.  
  3. Check the condition of the clutch pedal bushings for signs of sticking or excessive wear.
  4.  
  5. Check the throwout bearing fork for proper installation on the ball stud. The fork could possibly be pulled off the ball if not properly lubricated.
  6.  
  7. Check the crossshaft levers for distortion or damage.
  8.  
  9. Check the vehicle for loose or damaged motor mounts. Bad motor mounts can cause the engine to shift under acceleration and bind the clutch linkage at the crossshaft. There must be some clearance between the crossshaft and the motor mount.
  10.  
  11. Check the throwout bearing clearance between the clutch spring fingers and the front bearing retainer on the transmission. If there is no clearance, the fork may be improperly installed on the ball stud or the clutch disc may be worn out.
  12.  

FREE-PLAY ADJUSTMENT





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Fig. Fig. 1 Clutch linkage free-play adjustment for 1968-70 vehicles-adjustment is made at arrow



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Fig. Fig. 2 Clutch linkage free-play adjustment for 1971-73 vehicles

This adjustment must be made under the vehicle on the clutch operating linkage. Free-play is measured at the clutch pedal.

1968-70 Vehicles
  1. Disconnect the return spring at the clutch operating fork.
  2.  
  3. Use the linkage to push the clutch pedal up against its rubber bumper stop.
  4.  
  5. Loosen the operating rod locknut and lengthen the adjustment rod until it pushes the fork back enough that the release bearing can just be left to contact the pressure plate fingers.
  6.  
  7. Shorten the rod three turns and tighten the locknut.
  8.  
  9. Replace the spring and check the free-play at the pedal pad. It should be about 1 in. or more.
  10.  

1971-73 Vehicles

You can use this procedure on any earlier models that have a gauge hole in the clutch pivot shaft arm.

  1. Disconnect the return spring at the clutch operating fork.
  2.  
  3. Use the linkage to push the clutch pedal up against its rubber bumper stop. More clearance can be obtained by loosening the rubber bumper bracket and moving the bracket.
  4.  
  5. Push the end if the clutch operating fork to the rear until the release bearing can just be felt to contact the pressure plate fingers.
  6.  
  7. Detach the front end of the operating rod from the clutch pivot shaft arm and place it in the gauge hole on the arm.
  8.  
  9. Loosen the locknut and lengthen the rod just enough to take all the play out of the linkage. Tighten the locknut.
  10.  
  11. Replace the operating rod in its original location.
  12.  
  13. Replace the return spring and check the free-play at the pedal pad. It should be about 1 in. or more.
  14.  

 
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