GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Knocking Pistons and Rings

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When the pistons and/rings are constantly making noise, check for the following, as necessary:

  1. Misaligned connecting rods.
  2.  
  3. Out-of-round or tapered cylinder bore.
  4.  
  5. Loose or tight ring side clearance.
  6.  
  7. Build-up of carbon on the piston(s).
  8.  
  9. Piston-to-cylinder bore clearance is excessive.
  10.  
  11. Broken piston rings.
  12.  
  13. Loose or seized piston pin(s).
  14.  

 
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