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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1290 (Engine Mechanical - 1.8L (LV6)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Cylinder Head Assemble

Cylinder Head Assemble

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

  1. Use a steel square and measure the deviation of the valve spring.

    Valve Spring Deviation 

    1.6 mm (0.063 in)

    Fig 1: Measuring Deviation Of Valve Spring
    G01546949Courtesy of GENERAL MOTORS CORP.
  2. If the deviation of any valve spring is greater than the specified maximum, the valve spring must be replaced.
  3. Use a Vernier caliper and measure the free length of the valve spring.

    Intake Valve Spring Free Length 

    46.4 mm (1.830 in)

    Exhaust Valve Spring Free Length 

    46.5 mm (1.831 in)

    Fig 2: Measuring Free Length Of Valve Spring
    G01546950Courtesy of GENERAL MOTORS CORP.
  4. If the free length of any valve spring is not within specifications, the valve spring must be replaced.
  5. Use a spring tester and measure the tension of the valve spring at the specified installed height.

    Intake Valve Spring Tension 

    22.5-24.7 kgf (49.6-55.5 lbf) at 38.5 mm (1.516 in)

    Exhaust Valve Spring Tension 

    21.2-23.4 kgf (47.6-52.6 lbf) at 38.5 mm (1.516 in)

    Fig 3: Measuring Tension Of Valve Spring
    G01546951Courtesy of GENERAL MOTORS CORP.
  6. If the installed tension of any valve spring is not within specifications, the valve spring must be replaced.
  7. Inspect the valve spring seating surface of the valve spring seats for wear or gouging. Replace as required.
  8. Temporarily install the valves (1) into the cylinder head.
    Fig 4: Installing Valves Into Cylinder Head
    G01546952Courtesy of GENERAL MOTORS CORP.
  9. Use the following steps to measure valve runout:
    1. 9.1 Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.
    2. 9.2 Clean all traces of Prussian blue.
    3. 9.3 Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.
    4. 9.4 Recondition the valve seat or replace the valves, if required.

    Important:  Pay close attention when installing the valve seals. The intake valve seals are light brown in color and the exhaust valve seals are gray in color.

  10. Install the new valve seals. Fully seat the seals on the valve guides.
    Fig 5: Installing Valve Seals
    G01546953Courtesy of GENERAL MOTORS CORP.
  11. Install the spring seat (2).
  12. Install the spring (3).
  13. Install the retainer (4).
    Fig 6: Installing Spring Seat, Spring And Retainer
    G01546954Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to SAFETY GLASSES CAUTION .
  14. Compress the valve spring. Use the J 8062  and the J 43184  .
    Fig 7: Compressing Valve Spring
    G01546955Courtesy of GENERAL MOTORS CORP.
  15. Install the valve keepers.
  16. Slowly release the J 8062  (3) from the valve/spring assembly.
    Fig 8: Installing Valve Keepers
    G01546956Courtesy of GENERAL MOTORS CORP.
  17. Use a plastic faced hammer and lightly tap the valve stem tip and inspect for proper valve keeper seating.
    Fig 9: Tapping Valve Stem Tip
    G01546957Courtesy of GENERAL MOTORS CORP.
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