GM Full-Size Trucks 1980-1987 Repair Guide

Catalytic Converter

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An oxidizing catalytic converter is used to control hydrocarbon and carbon monoxide emissions. Control is accomplished by placing a catalytic converter in the exhaust stream. As exhaust gases pass through the converter they undergo a chemical reaction before passing into the atmosphere. The catalyst in the converter which causes the reaction are beads which are coated with platinum and palladium. The chemical reaction involved is the oxidizing of hydrocarbons and carbon monoxide into water vapor and carbon dioxide.

REMOVAL & INSTALLATION




CAUTION
Catalytic converter operating temperatures are extremely high. Outside converter temperatures can go well over +1,000ºF (+538ºC). Use extreme care when working on or around the catalytic converter.

  1. Remove the heat shield.
  2.  
  3. Raise and safely support the truck.
  4.  
  5. Remove the clamps at the front and rear of the converter.
  6.  
  7. Cut the converter pipes at the front and rear of the converter and remove it.
  8.  

To install:
  1. Install the exhaust pipe and tailpipe into the converter with sealer.
  2.  
  3. Install new U-bolts and clamps, check all clearances and tighten the clamps.
  4.  
  5. Install the heat shield.
  6.  
  7. Lower the truck.
  8.  

 
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