GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 TrailBlazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Valve Rocker Arm Cover Cleaning and Inspection

    Object Number: 824413 Size: SH

    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 or crankcase vent valve grommet from the covers unless service is required.
       • If the oil fill tube or crankcase vent valve grommet has been removed from the rocker arm covers, install a NEW tube or grommet during assembly.

  1. Remove the ignition coil and bracket assembly, bolts, and wire harness from the left cover, if required.

    2. Object Number: 825840 Size: SH
  2. Remove the ignition coil and bracket assembly, bolts, and wire harness from the right cover, if required.

    3. Object Number: 260110 Size: SH
  3. Inspect the tube for a loose fit or damage.
  4. Remove the oil fill cap and tube from the right cover, if required.

    5. Object Number: 1272820 Size: SH
  5. Remove the gaskets (504) from the covers.
  6. Remove the cover mounting bolts, with grommets.

    7. Cover mounting bolts and grommets that are not damaged may be used again during assembly.

  7. Clean the covers in solvent.

    8. Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 260085 Size: SH
  8. Dry the covers with compressed air.
  9. Inspect the ventilation system passages for restrictions.
  10. Inspect the gasket grooves for damage.
  11. Inspect the coil bracket threaded bolt holes for damage or debris.