GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2009 🢒 Vibe - AWD 🢒 Engine 🢒 Engine Mechanical - 2.4L (LAX) 🢒 Cylinder Head Cleaning and Inspection

    Object Number: 2017135 Size: SH
  1. Inspect cylinder head for warpage.
  2. Using a precision straight edge and a feeler gauge, measure the surface contacting the cylinder block and the manifolds for warpage.

    3. If the warpage is greater than the maximum, replace the cylinder head.


    Object Number: 2017136 Size: SH
  3. Using a dye penetrant, check the intake ports, exhaust ports and cylinder surface for cracks. If cracked, replace the cylinder head.
  4. Install the camshafts.

    5. Object Number: 2017156 Size: SH
  5. Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

    6. If the thrust clearance is greater than the maximum, replace the cylinder head. If the thrust surface is damaged, replace the camshaft.

  6. Inspect camshaft oil clearance.
  7. Clean the bearing caps and camshaft journals.
  8. Place the camshafts on the cylinder head.

    9. Object Number: 2016493 Size: SH
  9. Lay a strip of Plastigage across each of the camshaft journals.

    10. Note: Do not turn the camshaft.

  10. Install the bearing caps.
  11. Remove the bearing caps.

    12. Object Number: 2016903 Size: SH

    Note: Completely remove the Plastigage after the inspection.

  12. Measure the Plastigage at its widest point.
  13. If the oil clearance is greater than the maximum, replace the camshaft. If necessary, replace the cylinder head.
  14. If the oil clearance on the camshaft No. 1 journal is greater than the maximum, choose a new bearing and install it.

    15. Object Number: 2018173 Size: SH
  15. Check the number mark shown in the illustration.

    16. Camshaft Journal Diameter
    35.971 to 35.985 mm (1.4162 to 1.4167 in)


    Object Number: 2017190 Size: SH
  16. Inspect inner compression spring.
  17. Using vernier calipers, measure the free length of the valve spring.

    18. Free Length
    47.43 mm (1.867 in)

  18. If the free length is not as specified, replace the valve spring.

    19. Object Number: 2017191 Size: SH
  19. Using a steel set square, measure the deviation of the valve spring.

    20. Maximum Deviation
    1.6 mm (0.063 in)

  20. If the deviation is greater than the maximum, replace the valve spring.

    21. Object Number: 2017192 Size: SH
  21. Inspect intake valve
  22. Using a gasket scraper, scrape off any carbon on the valve head.

    23. Object Number: 2017193 Size: SH
  23. Using vernier calipers, measure the overall length of the valve.

    24. Specification

        • Standard overall length: 101.71 mm (4.0043 in)
        • Minimum overall length: 101.21 mm (3.9846 in)
  24. If the overall length is less than the minimum, replace the valve.

    25. Object Number: 2017194 Size: SH
  25. Using a micrometer, measure the diameter of the valve stem.

    26. Valve Stem Diameter
    5.470 to 5.485 mm (0.2154 to 0.2159 in)

  26. If the valve stem is not as specified, check the oil clearance.

    27. Object Number: 2018176 Size: SH
  27. Using vernier calipers, measure the valve head margin thickness.

    28. Specifications

        • Standard margin thickness: 1.05 to 1.45 mm (0.0413 to 0.0571 in)
        • Minimum margin thickness: 0.50 mm (0.0197 in)
  28. If the margin thickness is less than the minimum, replace the valve.

    29. Object Number: 2017192 Size: SH
  29. Using a gasket scraper, scrape off any carbon on the valve head.

    30. Object Number: 2017196 Size: SH
  30. Using vernier calipers, measure the overall length of the valve.

    31. Specifications

        • Standard overall length: 101.15 mm (3.9823 in)
        • Minimum overall length: 100.70 mm (3.9646 in)
  31. If the overall length is less than the minimum, replace the valve.

    32. Object Number: 2017198 Size: SH
  32. Using a micrometer, measure the diameter of the valve stem.

    33. Valve Stem Diameter
    5.465 to 5.480 mm (0.2152 to 0.2157 in)

  33. If the valve stem is not as specified, check the oil clearance.

    34. Object Number: 2017199 Size: SH
  34. Using vernier calipers, measure the valve head margin thickness (a).

    35. Specification

        • Standard margin thickness: 1.20 to 1.60 mm (0.0472 to 0.0630 in)
        • Minimum margin thickness: 0.50 mm (0.0197 in)
  35. If the margin thickness is less than the minimum, replace the valve.

    36. Object Number: 2018178 Size: SH
  36. Using a caliper gauge, measure the inside diameter of the guide bush.

    37. Bushing Inside Diameter
    5.510 to 5.530 mm (0.2169 to 0.2177 in)

  37. Subtract the valve stem diameter measurement from the guide bush inside diameter measurement.

    38. Specifications

        • Standard oil clearance: 0.025 to 0.060 mm (0.0010 to 0.0024 in)
        • Maximum oil clearance: 0.090 mm (0.0035 in)
  38. If the clearance is greater than the maximum, replace the valve and guide bush.

    39. Object Number: 2018179 Size: SH
  39. Using a caliper gauge, measure the inside diameter of the guide bush.

    40. Bushing Inside Diameter
    5.510 to 5.530 mm (0.2169 to 0.2177 in)

  40. Subtract the valve stem diameter measurement from the guide bushing inside diameter measurement.

    41. Specifications

        • Standard oil clearance: 0.030 to 0.065 mm (0.0012 to 0.0026 in)
        • Maximum oil clearance: 0.095 mm (0.0037 in)
  41. If the clearance is greater than the maximum, replace the valve and guide bush.

    42. Object Number: 2018181 Size: SH
  42. Using a micrometer, measure the lifter diameter.

    43. Lifter Diameter
    30.966 to 30.976 mm (1.2191 to 1.2195 in)


    Object Number: 2018183 Size: SH
  43. Using a caliper gauge, measure the lifter bore diameter of the cylinder head.

    44. Standard Lifter Bore Diameter
    31.009 to 31.025 mm (1.2208 to 1.2215 in)

  44. Subtract the lifter diameter measurement from the lifter bore diameter measurement.

    45. Oil Clearance

        • Standard oil clearance: 0.033 to 0.059 mm (0.0013 to 0.0023 in)
        • Maximum oil clearance: 0.079 mm (0.003 in)
  45. If the oil clearance is greater than the maximum, replace the lifter. If necessary, replace the cylinder head.
  46. Inspect cylinder head set bolt.
  47. Using vernier calipers, measure the length of the head bolts from the seat to the end.

    48. Specifications

        • Standard bolt length: 141.3 to 142.7 mm (5.563 to 5.618 in)
        • Maximum bolt length: 144.2 mm (5.677 in)
  48. If the bolt length is greater than the maximum, replace the cylinder head set bolt.

Item

Specified Condition

Maximum Warpage

Cylinder block side

0.08 mm (0.0031 in)

Intake manifold side

0.08 mm (0.0031 in)

Exhaust manifold side

0.08 mm (0.0031 in)

Standard Thrust Clearance

Intake

0.040 to 0.095 mm (0.0016 to 0.0037 in)

Exhaust

0.090 to 0.145 mm (0.0035 to 0.0057 in)

Maximum Thrust Clearance

Intake

0.110 mm (0.0043 in)

Exhaust

0.150 mm (0.0059 in)

Standard Oil Clearance

Camshaft No. 1 journal bearing mark 1

0.007 to 0.038 mm (0.0003 to 0.0015 in)

Camshaft No. 1 journal bearing mark 2

0.008 to 0.038 mm (0.0003 to 0.0015 in)

Camshaft No. 1 journal bearing mark 3

0.008 to 0.038 mm (0.0003 to 0.0015 in)

Camshaft other journals

0.025 to 0.062 mm (0.0010 to 0.0024 in)

No. 2 camshaft No. 1 journal

0.040 to 0.072 mm (0.0016 to 0.0028 in)

No. 2 camshaft other journals

0.025 to 0.062 mm (0.0010 to 0.0024 in)

Maximum Oil Clearance

Intake

0.070 mm (0.0028 in)

Exhaust

0.100 mm (0.0039 in)


Mark 1

Mark 2

Mark 3

Cylinder Head Journal Bore Diameter

40.000 to 40.009 mm (1.5748 to 1.5752 in)

40.010 to 40.017 mm (1.5752 to 1.5755 in)

40.018 to 40.025 mm (1.5755 to 1.5758 in)

Standard Bearing Center Wall Thickness

2.000 to 2.004 mm (0.0787 to 0.0789 in)

2.005 to 2.008 mm (0.0789 to 0.0791 in)

2.009 to 2.012 mm (0.0791 to 0.0792 in)