Nissan Pick-ups and Pathfinder 1970-1988

Clutch Master Cylinder

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CAUTION
The clutch driven disc contains asbestos, which has been determined to be a cancer causing agent. Never clean clutch surfaces with compressed air. Avoid inhaling any dust from any clutch surface. When cleaning clutch surfaces, use a commercially available brake cleaning fluid.

REMOVAL & INSTALLATION



  1. Disconnect the master cylinder pushrod from the clutch pedal.
  2.  
  3. Remove the hydraulic line from the master cylinder being careful not to damage the compression fitting.
  4.  
  5. Remove the two bolts holding the master cylinder to the engine compartment.
  6.  


CAUTION
Brake fluid dissolves paint. Do not allow it to drip onto the body when removing the master cylinder.

To install:
  1. Install the master cylinder. Partially tighten the hydraulic line and then tighten the cylinder mounting bolts.
  2.  
  3. Connect the pushrod to the clutch pedal.
  4.  
  5. Adjust the clutch pedal and bleed the system.
  6.  

OVERHAUL



See Figure 1

  1. Disassemble the master cylinder by unscrewing the clutch pedal clevis from the pushrod. Also remove the locknut.
  2.  
  3. Pull off the rubber boot to expose an internal snapring. Remove the snapring and withdraw the piston and compression spring.
  4.  
  5. Take a clean rag and wipe out the inside of the cylinder. Inspect the inside of the cylinder for scoring and deposits. Use crocus cloth or a small hone to refinish the inside of the cylinder. If light honing will not remove score marks replace the cylinder.
  6.  

Be careful not to remove too much from the cylinder walls as the cups will not be able to seal the cylinder if the diameter is enlarged excessively.

  1. Wash all metal parts in solvent.
  2.  
  3. Further disassembly should be avoided unless the reservoir is leaking. If the reservoir needs to be replaced, remove the cap and remove the master cylinder reservoir bolt located at the bottom of the reservoir. Tighten the bolt upon reassembly.
  4.  
  5. With new parts from the rebuilding kit assemble the master cylinder. Coat the cylinder wall with brake fluid so that the edges of the new cups will not be damaged. Coat the piston with lithium soap based glycol grease.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the clutch master cylinder

 
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