GM Chevy Mid-Size Cars 1964-1988 Repair Guide

PCV Breather

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Most breathers are located inside the air cleaner assembly, though they may be mounted directly to a valve cover. Although a breather may in some cases be removed and cleaned, it is an inexpensive part and it is wise to replace it if dirty. Breathers which are mounted directly to the valve cover may be simply grasped and pulled from the cover grommet. For breathers which are mounted inside the air cleaner follow the procedure listed below.

REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Loosen the wing nut and remove the top of the air cleaner assembly.
  2.  
  3. Slide the rubber coupling that joins the tube coming from the valve cover to the breather off the breather nipple.
  4.  
  5. Slide the spring clamp off the breather nipple which is protruding from the air cleaner housing, then withdraw the breather from inside the air cleaner assembly.
  6.  
  7. Inspect the rubber grommet in the valve cover and the rubber coupling for brittleness or cracking. Replace parts as necessary.
  8.  

To install:
  1. Insert the new PCV breather through the hole in the air cleaner with the open portion of the breather upward. Make sure that the square portion of breather behind the nipple fits into the (square) hole in the air cleaner.
  2.  
  3. Install a new spring clamp onto the nipple. Make sure the clamp goes under the ridge on the breather nipple all the way around.
  4.  
  5. Reconnect the rubber coupling.
  6.  
  7. Install the air cleaner cover and tighten the wing nut.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Disconnect the hose from the breather nipple



Click image to see an enlarged view

Fig. Fig. 2: This picture shows the relationship between the spring clamp and the breather

 
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