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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions (10 Of 12) >> Repair Instructions >> Valve Rocker Arm and Push Rod Replacement - Right Side >> Cleaning and Inspection Procedure - Conditional

Cleaning and Inspection Procedure - Conditional

NOTE:

Perform the following cleaning and inspection or overhaul steps, as necessary. ONLY perform steps when components are removed with the intention of reinstallation.

    NOTE:

    Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation.

  1. Inspection the spark plug wire for the following conditions:
    1. Correct routing of the spark plug wires. Incorrect routing may cause cross-firing.
    2. Inspect for any signs of cracks or splits in the wires.
  2. Inspect each boot for the following conditions:
    1. Tearing
    2. Piercing
    3. Arcing
    4. Carbon tracking
    5. Corroded terminals
  3. If corrosion, carbon tracking or arcing are indicated on a spark plug wire boot or on a terminal, replace the wire and the component connected to the wire.
  4. GM5035067Courtesy of GENERAL MOTORS COMPANY

    Remove the ignition coil bolts (1) and ignition coils (2) before cleaning the valve rocker arm cover in solvent. Do not submerge the ignition coils in solvent.

  5. Inspect the valve rocker arm covers (3) for the following conditions:
    1. Scoring or damage to the gasket surfaces
    2. Ventilation system passages for restrictions
    3. Threaded bolt holes for damage or debris
  6. GM5035065Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Parts that are to be used again must be marked, sorted or organized for assembly.

    Mark, sort, or organize the components for assembly.

  7. Clean the components with cleaning solvent.
    8. WARNING:

    Refer to Safety Glasses and Compressed Air Warning .

  8. Dry the components with compressed air.
  9. Inspect the valve rocker arms bearings (2) for binding or roughness.
  10. Inspect the valve rocker arm pushrod sockets (3) and valve stem mating surfaces (1). These surfaces should be smooth with no scoring or exceptional wear.
  11. Inspect the pushrods for worn or scored ends. These surfaces should be smooth with no scoring or exceptional wear.
  12. Inspect the pushrods for bends. Roll the pushrod on a flat surface to determine if the pushrod is bent.
  13. Inspect the pushrod oil passages for restrictions.
  14. Inspect the rocker arm pivot supports for cracks, wear, or other damage.
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