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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical - 1.8L (Lay)) >> Repair Instructions - Off Vehicle >> Crankshaft and Bearing Cleaning and Inspection

Crankshaft and Bearing Cleaning and Inspection

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  1. Inspect connecting rod thrust clearance.
  2. Install the connecting rod cap.
    3. Fig 1: Identifying Thrust Bearing Clearance
    GM2017271Courtesy of GENERAL MOTORS CORP.
  3. Using a dial indicator, measure the thrust clearance while moving the connecting rod back and forth.

    Specification: 

    • Standard thrust clearance: 0.160-0.342 mm (0.0063-0.0135 in)
    • Maximum thrust clearance: 0.342 mm (0.0135 in)

  4. If the thrust clearance is greater than the maximum, replace the connecting rod assemblies as necessary. If necessary, replace the crankshaft.
  5. Inspect connecting rod oil clearance.
  6. Clean the crank pin and bearing.
  7. Check the crank pin and bearing for pitting and scratches.
    8. Fig 2: View Of Measuring Clearance Using Plastigage
    GM2017272Courtesy of GENERAL MOTORS CORP.
  8. Lay a strip of Plastigage on the crank pin.
    9. Fig 3: Identifying Connecting Rod Cap Installation
    GM2017273Courtesy of GENERAL MOTORS CORP.
  9. Check that the front mark of the connecting rod cap is facing forward.
    10. NOTE: Do not turn the crankshaft.
  10. Install the connecting rod cap.
  11. Remove the 2 bolts and connecting rod cap.
  12. Measure the Plastigage at its widest point.

    Specification: 

    • Standard oil clearance: 0.030-0.062 mm (0.0012-0.0024 in)
    • Maximum oil clearance: 0.07 mm (0.0028 in)

    13. NOTE: Completely remove the Plastigage after the measurement.
    If replacing a bearing, replace it with one that has the same number as its respective connecting rod cap. Each bearing standard thickness is indicated by a 1, 2, or 3 mark on its surface.
  13. If the oil clearance is greater than the maximum, replace the connecting rod bearings. If necessary, inspect the crankshaft.
    14. Fig 4: Measuring Crankshaft Circle Runout
    GM2017298Courtesy of GENERAL MOTORS CORP.
  14. Inspect the crankshaft.
  15. Using a dial indicator and V-blocks, measure the circle runout as shown in the illustration.

    Specification:  Maximum circle runout: 0.03 mm (0.0012 in)

  16. If the taper and distortion are greater than the maximum, replace the crankshaft.
    17. Fig 5: Measuring Diameter Of Main Journals
    GM2017299Courtesy of GENERAL MOTORS CORP.
  17. Using a micrometer, measure the diameter of each main journal.

    Specification:  Standard diameter: 47.988-48.000 mm (1.8893-1.8898 in)

  18. If the diameter is not as specified, check the crankshaft oil clearance.
  19. Check each main journal for taper and distortion as shown in the illustration.

    Specification:  Maximum taper and distortion: 0.004 mm (0.0002 in)

  20. If the taper and distortion are greater than the maximum, replace the crankshaft.
    21. Fig 6: Measuring Diameter Of Crank Pin
    GM2017301Courtesy of GENERAL MOTORS CORP.
  21. Using a micrometer, measure the diameter of each crank pin.

    Specification:  Standard diameter: 43.992-44.000 mm (1.7320-1.7323 in)

  22. If the diameter is not as specified, check the connecting rod oil clearance.
  23. Inspect each crank pin for taper and distortion as shown in the illustration.

    Specification:  Maximum taper and distortion: 0.004 mm (0.0002 in)

  24. If the taper and distortion are greater than the maximum, replace the crankshaft.
  25. Inspect crankshaft thrust clearance.
  26. Install the main bearing cap.
    27. Fig 7: Measuring Thrust Clearance While Prying Crankshaft Back & Forth
    GM2017303Courtesy of GENERAL MOTORS CORP.
  27. Using a dial indicator, measure the thrust clearance while prying the crankshaft back and forth with a screwdriver.

    Specification: 

    • Standard thrust clearance: 0.04- 0.14 mm (0.0016-0.0055 in)
    • Maximum thrust clearance: 0.18 mm (0.0071 in)

    28. NOTE: The thrust washer thickness is 2.43-2.48 mm (0.0957-0.0976 in).
  28. If the thrust clearance is greater than the maximum, replace the thrust washers as a set.
  29. Inspect the crankshaft oil clearance.
  30. Check the crank journal and bearing for pitting and scratches.
  31. Install the crankshaft bearing.
  32. Place the crankshaft on the cylinder block.
    33. Fig 8: View Of Measuring Journal Clearance Using Plastigage
    GM2017304Courtesy of GENERAL MOTORS CORP.
  33. Lay a strip of Plastigage across each journal.
    34. NOTE: A number is marked on each main bearing cap to indicate the installation position.
  34. Examine the front marks and numbers and install the bearing caps on the cylinder block
    35. NOTE: Do not turn the crankshaft.
  35. Install the main bearing cap.
  36. Remove the main bearing caps.
    37. Fig 9: View Of Measuring Plastigage At Widest Point
    GM2017305Courtesy of GENERAL MOTORS CORP.
  37. Measure the Plastigage at its widest point.

    Specification: 

    • Standard oil clearance: 0.016-0.039 mm (0.0006-0.0015 in)
    • Maximum oil clearance: 0.050 mm (0.0020 in)

    38. NOTE:
    • Remove the Plastigage completely after the measurement.
    • If replacing a bearing, select a new one with the same number. If the number of the bearing cannot be determined, calculate the correct bearing number by adding together the numbers imprinted on the cylinder block and crankshaft. Then select a new bearing with the calculated number according to the chart below. There are 4 sizes of standard bearings, marked 1, 2, 3 and 4 accordingly.
    • EXAMPLE: Cylinder block 3 + Crankshaft 5 = Total number 8 (Use bearing 3)
  38. If the oil clearance is greater than the maximum, replace the crankshaft bearing. If necessary, replace the crankshaft.
    39. Fig 10: Inspecting Cylinder Head Set Bolt
    GM2017306Courtesy of GENERAL MOTORS CORP.
  39. Inspect the cylinder head set bolt.
  40. Using vernier calipers, measure the tension portion diameter of the bolts.

    Specification: 

    • Standard bolt length: 84.3-85.7 mm (3.3189-3.3740 in)
    • Maximum bolt length: 86.7 mm (3.4134 in)

  41. If the bolt length is greater than the maximum, replace the bolt.
    42. NOTE: Using a straightedge, visually check for thinner areas of the threaded part of the crankshaft bearing cap bolt.
  42. Using vernier calipers, measure the minimum diameter of the elongated thread at the measuring point.

    Specification: 

    • Standard outside diameter: 9.77-9.96 mm (0.3846-0.3921 in)
    • Minimum outside diameter: 9.1 mm (0.3583 in)

  43. If the diameter is less than the minimum, replace the bolt.
    44. NOTE: If there is damage or clogging, replace the oil nozzle.
  44. Check the oil nozzles for damage or clogging.
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