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Valve Rocker Arm Cover Cleaning And Inspection

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Valve Rocker Arm Cover Components
    GM1559813Courtesy of GENERAL MOTORS COMPANY
    IMPORTANT:
    • Do not use the valve rocker arm cover gasket again. Install a NEW gasket during assembly.
    • Remove the ignition coils before cleaning the cover in solvent. Do not submerge the ignition coils in solvent.
    • Do not remove the oil fill tube from the covers unless service is required. If the tube is removed from the cover, install a NEW tube (423) and seal (422) during assembly.
  1. Inspect the oil fill tube (423) for a loose fit or damage.
  2. Inspect the covers (505) for the following conditions:
    • Scoring or damage to the gasket surfaces
    • Ventilation system passages for restrictions
    • Threaded bolt holes for damage or debris
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