Valve Rocker Arm Cover Cleaning and Inspection

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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 have been removed from the rocker arm covers, install a NEW tube or grommet during assembly.

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

Fig 1: Removing Ignition Coil, Bracket Assembly, Bolts & Wire Harness (Left Side)
Courtesy of GENERAL MOTORS CORP.
Remove the ignition coil and bracket assembly, bolts, and wire harness from the right cover, if required.

Fig 2: Removing Ignition Coil And Bracket Assembly, Bolts, And Wire Harness (Right Side)
Courtesy of GENERAL MOTORS CORP.
Inspect the tube for a loose fit or damage.
Remove the oil fill cap and tube from the right cover, if required.

Fig 3: Removing Oil Fill Cap & Tube
Courtesy of GENERAL MOTORS CORP.
Remove the gaskets (1) from the covers.
Remove the cover mounting bolts, with grommets.
Cover mounting bolts and grommets that are not damaged may be used again during assembly.
Clean the covers in solvent.

Fig 4: Removing Gaskets
Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to SAFETY GLASSES CAUTION .
Dry the covers with compressed air.
Inspect the ventilation system passages for restrictions.
Inspect the gasket grooves for damage.
Inspect the coil bracket threaded bolt holes for damage or debris.

Fig 5: Rocker Arm Cover & Bolt
Courtesy of GENERAL MOTORS CORP.