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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1079 (Engine Mechanical - 6.6L (3 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 4) >> Crankshaft and Bearing Cleaning and Inspection >> Crankshaft Bearing Selection Grade Chart Method

Crankshaft Bearing Selection Grade Chart Method

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Stamp ID Main Journal Conn. Rod Journal
No Stamp STD STD
M20 R20 0.020 in 0.020 in
    Fig 1: Locating Crankshaft Stamping Marks (Undersized Main or Rod Journals)
    GM1775612Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: All crankshafts that have been machined have a steel stamping (1) on the 1st counterweight.
  1. Inspect the crankshaft for stamping (1) indicating undersized main and/or rod journals.
    2. Fig 2: View Of Cylinder Block Grade
    GM663785Courtesy of GENERAL MOTORS CORP.
  2. The cylinder block grade is indicated on the right lower portion of the cylinder block.
    3. Fig 3: View of Crankshaft Journal Grade
    GM663786Courtesy of GENERAL MOTORS CORP.
  3. The crankshaft journal grade is indicated on the number 1 crankshaft counterweight.
  4. Match the cylinder block grade and the crankshaft journal grade, refer to Crankshaft Bearing Selection Specifications .
  5. From the Crankshaft Bearing Grade chart, determine which bearing grade (color code) is required.
  6. Verify the crankshaft bearing clearance using the plastic gage method.
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