Toyota Cressida/Corona/Crown/MarkII 1970-1982 Repair Guide

PCV Valve

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Pull the PCV valve out of the grommet and remove the ventilation hose from the valve 1. Grommet 2. PCV valve 3. Ventilation hose



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Fig. Fig. 2 Exploded view of the PCV system-2M and 4M engines



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Fig. Fig. 3 View of the PCV system components-except 2M and 4M engines

The PCV valve regulates crankcase ventilation during various engine operating conditions. At high vacuum (idle speed and partial load range) it will open slightly and at low vacuum (full throttle) it will open fully. This causes vapor to be removed from the crankcase by the engine vacuum and then sucked into the combustion chamber where it is dissipated.

The PCV valve should be replaced every 12 months or 12,000 miles on models made prior to 1972. On the 1972- 77 models, inspect the valve every 12 months or 12,000 miles and replace it every 24 months 24,000 miles (whichever occurs first). On the 1978-82 models, replace the PCV valve every 30,000 miles or 24 months. On California models, 1980-82, replace it every 60,000 miles.

  1. Check the ventilation hoses for leaks or clogging. Clean or replace as necessary.
  2.  
  3. Locate the PCV valve in the cylinder head cover. Remove it.
  4.  
  5. Blow into the crankcase end of the valve. There should be free passage of air through the valve.
  6.  
  7. Blow into the intake manifold end of the valve. There should be little or no passage of air through the valve.
  8.  
  9. If the PCV valve failed either of the preceding two checks, it will require replacement.
  10.  
  11. Inspect the PCV grommet. Replace if necessary.
  12.  

To install:

  1. Insert the PCV valve into the grommet.
  2.  
  3. Place the ventilation hose on the end of the valve.
  4.  

 
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