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

Knocking Main Bearings

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When the main bearings are constantly making noise, check for the following, as necessary:

  1. Oval shaped crankshaft journals.
  2.  
  3. Loose torque converter or flywheel mounting bolts.
  4.  
  5. Loose damper pulley hub.
  6.  
  7. Excessive clearance of the main bearings.
  8.  
  9. Excessive belt tension.
  10.  
  11. Low oil supply to the main bearings.
  12.  
  13. Extreme crankshaft end play.
  14.  

 
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