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Home >> Cadillac >> 2021 >> CT4 V, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.7L (L3B) - Repair Instructions - Ct4 (4 Of 6) >> Cylinder Head Overhaul >> Assemble Procedure

Assemble Procedure

  1. GM5041200Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Component Fastener Tightening Caution

    CAUTION:

    In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.

    Install NEW cylinder head plugs (1), (2), (3), (4), and (5). Coat the plugs with sealer. Adhesives, Fluids, Lubricants, and Sealers

  2. Install the water jacket hole plugs (1) in the top of the cylinder head. Tighten the plugs to - Fastener Specifications .
  3. Inspect the valve springs for the following conditions:
    • Expanded height
    • Unparallel spring ends
    • Spring tension using EN-9666  Valve Spring Tester
    • Any distorted springs should be replaced
  4. GM5041196Courtesy of GENERAL MOTORS COMPANY

    Inspect the valves and the valve seats.

  5. Lubricate the first 40 mm of valve stem before installation. Adhesives, Fluids, Lubricants, and Sealers
    6. NOTE:

    Replace the valves, if required.

  6. Exhaust Valve (1) - Install
  7. Intake Valve (2) - Install
  8. GM5041192Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Always use NEW valve stem oil seals when assembling the cylinder head.

    CAUTION:

    Do not damage the valve guide. Remove any burrs that have formed at the key groove by chamfering the valve stem with an oil stone or a file.

    Valve Stem Oil Seal (1) - Install NEW

  9. GM5041190Courtesy of GENERAL MOTORS COMPANY

    Valve Spring (1) - Install

  10. GM5041187Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

    CAUTION:

    Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

    Install the retainers and keys using the following procedure:

    1. Valve Spring Retainer (2) - Install
    2. Using the EN-50517  Valve Spring Compressor and the EN-50517 - 20  Valve Spring Compressor Adapter, compress the valve spring.
    3. Valve Stem Key (1) - Install
    4. Slowly release the compression from the valve/spring assembly.
    5. Inspect for proper valve key seating.
  11. GM5041185Courtesy of GENERAL MOTORS COMPANY

    Hydraulic Valve Lash Adjuster (1) - Install

  12. Lubricate on tip to RFF and outside body to oil galley before installation. Adhesives, Fluids, Lubricants, and Sealers
  13. GM5041183Courtesy of GENERAL MOTORS COMPANY

    Valve Rocker Arm (1) - Install

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