GM Astro/Safari 1985-1996 Repair Guide

Knocking Pistons and Rings

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When the pistons and/rings are constantly making noise, replace or repair the following items or systems, as necessary:



Misaligned connecting rods.
 
Out-of-round or tapered cylinder bore.
 
Loose or tight ring side clearance.
 
Build-up of carbon on the piston(s).
 
Piston-to-cylinder bore clearance is excessive.
 
Broken piston rings.
 
Loose or seized piston pin(s).
 

 
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