Jeep CJ/Scrambler 1971-1986 Repair Guide

Catalytic Converter

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CAUTION
When working on exhaust systems, ALWAYS wear protective goggles! Avoid working on a hot exhaust system!

See Figures 1, 2, 3 and 4

REMOVAL & INSTALLATION



  1. Raise and support the rear end on jackstands.
  2.  
  3. Disconnect the downstream air injection tube at the converter.
  4.  
  5. On the 4-cylinder engine, the front pipe is bolted to the converter at a facing flange. On the 6- and 8-cylinder engines, the front pipe and converter are clamped together at a slip-fit joint. On all engines, the rear joint of the converter is a slip-fit.
  6.  
  7. To avoid damaging any components, it will probably be necessary to heat any slip-fit joint with an oxyacetylene torch, until the joint is cherry red. Then, place a block of wood against the converter and drive it off of the pipe.
  8.  


CAUTION
When using a torch, make certain that no combustibles or brake or fuel lines are in the immediate area of the torch.

  1. Position the replacement converter in the system and install the rear clamp. Hand tighten the nuts.
  2.  
  3. On 4-cylinder engines: bolt the flanges together at the front end. Tighten the bolts to 25 ft. lbs. Tighten the rear clamp nuts to 45 ft. lbs.
  4.  
  5. On 6- and 8-cylinder engines, install the front clamp, make sure that the converter is properly positioned and tighten the front and rear clamp nuts to 45 ft. lbs.
  6.  
  7. Install the downstream air injection tube and tighten the clamps to 36-48 inch lbs.
  8.  
  9. Lower the Jeep.
  10.  



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Fig. Fig. 1: Exhaust system used on late model 4-134 and 6-225 equipped models



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Fig. Fig. 2: Exhaust system used on models with the 4-151 engine



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Fig. Fig. 3: Exhaust system used on 1975-79 models with the 6-258 engine



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Fig. Fig. 4: Exhaust system used on 1980-786 models with the 6-258 engine

 
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