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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 5.3L) >> Repair Instructions - Off Vehicle >> Piston, Connecting Rod, and Bearing Cleaning and Inspection >> Connecting Rod and Bearings

Connecting Rod and Bearings

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    Fig 1: View Of Piston, Pin & Piston Rings
    GM1559868Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • 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 piston, pin, and connecting rod 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. CAUTION: Refer to Safety Glasses Caution .
  2. Dry the components with compressed air.
    3. Fig 2: Identifying Connecting Rod Inspection Areas
    GM1366360Courtesy of GENERAL MOTORS CORP.
  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 CORP.
  4. Measure the connecting rod bearing bore for an out-of-round condition. Refer to Engine Mechanical Specifications .
    5. Fig 4: Measuring Piston Pin Diameter
    GM4976Courtesy of GENERAL MOTORS CORP.
  5. To determine full-floating piston pin-to-connecting rod bore clearance, use a micrometer and measure the piston pin outside diameter (OD).
    6. Fig 5: Measuring Connecting Rod Pin Bore Inside Diameter
    GM1366411Courtesy of GENERAL MOTORS CORP.
  6. To determine the full-floating piston pin-to-connecting rod bore clearance, use a micrometer and measure the connecting rod pin bore (1) inside diameter (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 .
    8. Fig 6: Identifying Crankshaft Bearing Craters Or Pockets
    GM52051Courtesy of GENERAL MOTORS CORP.
  8. Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves indicate fatigue.
    9. Fig 7: Inspecting Connecting Rod Bearings For Excess Scoring Or Discoloration
    GM52053Courtesy of GENERAL MOTORS CORP.
  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 Polished Sections (Improper Seating)
    GM52056Courtesy of GENERAL MOTORS CORP.
  11. Inspect the connecting rod bearings for improper seating indicated by bright, polished sections of the bearing surface.
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