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Home >> Chevrolet >> 2007 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 1.4L DOHC >> Repair Instructions >> Piston, Connecting Rod, and Bearings Cleaning and Inspection >> Piston Inspection

Piston Inspection

    CAUTION: Refer to Safety Glasses Caution .
  1. Inspect the connecting rod for bending or twisting. If the connecting rod is bent or twisted, replace the connecting rod.
  2. Inspect the connecting rod bearings.
  3. Inspect the connecting rod lower end for wear.
  4. Inspect the connecting rod upper end for scoring.
  5. Inspect the crankshaft rod bearing journal for wear. Refer to Engine Mechanical Specifications .
  6. Inspect the piston for scoring, cracks, and wear.
    7. Fig 1: Inspecting Piston For Taper
    GM1241710Courtesy of GENERAL MOTORS CORP.
  7. Inspect the piston for taper using a micrometer.
    8. Fig 2: Inspecting Piston And Connecting Rod Fit
    GM1241742Courtesy of GENERAL MOTORS CORP.
  8. Inspect the piston for fit to the connecting rod.
    9. Fig 3: Inspecting Engine Block Cylinder Bore
    GM1241734Courtesy of GENERAL MOTORS CORP.
  9. Inspect the engine block deck surface for flatness using a straight edge and a feeler gage. Refer to Engine Mechanical Specifications .
  10. Inspect the bearing bore for concentricity and alignment using a bore gage. Refer to Engine Mechanical Specifications . If beyond specifications, replace the engine block.
  11. Inspect the engine block cylinder bore for wear, runout, ridging, and taper using a bore gage. Refer to Engine Mechanical Specifications .
  12. Inspect the engine block cylinder bore for glazing.
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