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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 >> Crankshaft and Bearings Cleaning and Inspection >> Tools Required

Tools Required

    Fig 1: Inspecting Crankshaft End Play
    GM1241789Courtesy of GENERAL MOTORS CORP.
  1. Coat the crankshaft bearings with engine oil.
  2. Install the upper crankshaft bearings into the engine block crankshaft journals.
  3. Install the lower crankshaft bearings into the crankshaft bearing caps.
  4. Install the crankshaft.
  5. Inspect the crankshaft end play with the crankshaft bearings installed.
  6. Check for permissible crankshaft end play. Refer to Engine Mechanical Specifications .
    7. Fig 2: Checking Crankshaft Journal For Out-Of-Round Runout
    GM1241794Courtesy of GENERAL MOTORS CORP.
  7. With the crankshaft mounted on the front and the rear crankshaft bearings, check the middle crankshaft journal for permissible out-of-round runout. Refer to Engine Mechanical Specifications .
    8. Fig 3: View Of Plastigage On Journal
    GM1241455Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Grease the crankshaft journals and lubricate the crankshaft bearings slightly so that the plastic gaging thread does not tear when the crankshaft bearing caps are removed.
  8. Measure all of the crankshaft bearing clearance using a commercially available plastic gaging, ductile plastic threads.
  9. Cut the plastic gaging threads to the length of the bearing width (1). Lay them axially between the crankshaft journals and the crankshaft bearings.
    10. Fig 4: Using J 45059 To Tighten Bearing Caps
    GM1241797Courtesy of GENERAL MOTORS CORP.
  10. Install the crankshaft bearing caps.
    11. NOTE: Refer to Fastener Notice .
  11. Install the crankshaft bearing cap bolts.

    Tighten:  Tighten the crankshaft bearing cap bolts to 50 N.m (37 lb ft)  . Using the J 45059  or the KM-470-B  (1), tighten the crankshaft bearing cap bolts another 45 degrees plus 15 degrees. See Special Tools .

    12. Fig 5: Measuring Plastigage
    GM1241457Courtesy of GENERAL MOTORS CORP.
  12. Remove the crankshaft bearing caps.
  13. Measure the width of the flattened plastic thread (1) of the plastic gaging using the scale printed on the plastic gaging package. Plastic gaging is available for different tolerance ranges.
  14. Inspect the bearing clearances for permissible tolerance ranges. Refer to Engine Mechanical Specifications .
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