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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Mechanical - 4.3L) >> Repair Instructions - Off Vehicle >> Crankshaft and Bearings Cleaning and Inspection >> Measuring Crankshaft Bearing Clearances - Plastic Gage Method

Measuring Crankshaft Bearing Clearances - Plastic Gage Method

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Crankshaft Bearings At Engine Block
    GM334338Courtesy of GENERAL MOTORS CORP.
  1. Install the crankshaft bearings into the engine block.
    2. Fig 2: View Of Crankshaft
    GM334336Courtesy of GENERAL MOTORS CORP.
  2. Install the crankshaft.
    3. Fig 3: View Of Plastic Gage Over Crankshaft Journal
    GM500655Courtesy of GENERAL MOTORS CORP.
  3. Install the gaging plastic the full width of the journal.
    4. Fig 4: View Of Crankshaft Bearings & Crankshaft Bearing Caps
    GM334342Courtesy of GENERAL MOTORS CORP.
  4. Install the crankshaft bearings into the crankshaft bearing caps.
    5. Fig 5: Crankshaft Bearing Caps
    GM334329Courtesy of GENERAL MOTORS CORP.
  5. Install the crankshaft bearing caps in the original positions and with the arrow on the crankshaft bearing caps in the direction of the front of the engine block.
    6. NOTE: Refer to Fastener Notice .
  6. Install the crankshaft bearing cap bolts.

    Tighten:  Tighten the crankshaft bearing caps to 105 N.m (77 lb ft).

  7. Remove the crankshaft bearing cap bolts.
  8. Remove the crankshaft bearing caps. The gaging plastic may adhere to either the crankshaft bearing journal or the crankshaft bearing surface.
    9. Fig 6: Measuring Compressed Width
    GM500656Courtesy of GENERAL MOTORS CORP.
  9. Without removing the gaging plastic, measure the compressed width at the widest point using the graduated scale on the edge of the gaging plastic envelope.

    If the flattened gaging plastic tapers toward the middle or the ends, there may be a difference in clearance indicating taper, low spot or other irregularity of the crankshaft bearing or the crankshaft bearing journal.

  10. Remove the flattened gaging plastic.
  11. Measure the remaining crankshaft bearing journals.
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