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Home >> Chevrolet >> 2015 >> Camaro LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Mechanical - 6.2L (L99 LS3 LSA) Or 7.0L (LS7) - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Piston, Connecting Rod, and Bearing Cleaning and Inspection (LS3, L99, or LSA) >> Connecting Rod and Bearings

Connecting Rod and Bearings

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Piston, Pin & Piston Rings
    GM1559868Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • The powdered metal connecting rod and cap are machined for proper clearances. The connecting rod and cap must be used as an assembly with no repair or modifications to either mating surface. Do not attempt to repair the rod or cap. If service is required, replace the rod and cap as an assembly.
    • Do not attempt to repair the bolt hole threads of the connecting rod.
  1. Clean the connecting rod (105) and cap (103) in solvent.
    2. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  2. Dry the components with compressed air.
    3. Fig 2: Identifying Connecting Rod Inspection Areas
    GM1366360Courtesy of GENERAL MOTORS COMPANY
  3. Inspect the connecting rod for the following conditions:
    • Twisting (1)
    • Proper fit of the connecting rod and cap mating surfaces (2)
    • Nicks or gouges in the bearing bore (3)
    • Damage to the bearing locating slots (4)
    4. Fig 3: Identifying Connecting Rod Bearing Bore
    GM1552442Courtesy of GENERAL MOTORS COMPANY
  4. Measure the connecting rod bearing bore for an out-of-round condition. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA) .
    5. Fig 4: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS COMPANY
  5. To determine piston pin-to-connecting rod bore clearance, use a micrometer and measure the piston pin OD.
    6. Fig 5: Measuring Connecting Rod Pin Bore Inside Diameter
    GM1366411Courtesy of GENERAL MOTORS COMPANY
  6. To determine the piston pin-to-connecting rod bore clearance, use a micrometer and measure the connecting rod pin bore (1) ID.
  7. Subtract the piston pin OD measurement from the connecting rod pin bore ID measurement to determine pin-to-bore clearance. Refer to Engine Mechanical Specifications (L99)Engine Mechanical Specifications (LS3)Engine Mechanical Specifications (LSA) .
    8. Fig 6: Identifying Crankshaft Bearing Craters Or Pockets
    GM52051Courtesy of GENERAL MOTORS COMPANY
  8. Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves indicate fatigue.
    9. Fig 7: Identifying Connecting Rod Bearing Scoring Or Discoloration
    GM52053Courtesy of GENERAL MOTORS COMPANY
  9. Inspect the connecting rod bearings for excessive scoring or discoloration.
  10. Inspect the connecting rod bearings for dirt or debris imbedded into the bearing material.
    11. Fig 8: View Of Crankshaft Bearing Improper Seating
    GM52056Courtesy of GENERAL MOTORS COMPANY
  11. Inspect the connecting rod bearings for improper seating indicated by bright, polished sections of the bearing surface.
  12. Measure the connecting rod bearings for excessive connecting rod bearing-to-crankshaft journal clearance. Refer to Crankshaft and Bearing Cleaning and Inspection (LS3, L99, or LS7) Crankshaft and Bearing Cleaning and Inspection (LSA) .
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