Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Harness Electrical Connectors And Inlet Hose Clamp

Courtesy of GENERAL MOTORS CORP.

Remove the intake manifold. Refer to Intake Manifold Replacement (RPOs LC9, LMG, LY5, L76) , Intake Manifold Replacement (RPOs LY2, LY6) , Intake Manifold Replacement (Except RPOs LY2, LY6, LC9, LMG, LY5) .
Disconnect the engine harness electrical connector (1) from the oil pressure sensor.

Fig 2: Valve Lifter Oil Manifold Handling Precaution

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DO NOT lift the valve lifter oil manifold by the electrical lead frame.

Fig 3: Valve Lifter Oil Manifold

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Remove the valve lifter oil manifold bolts (2).
Remove the valve lifter oil manifold (1).

Fig 4: Gasket Retaining Strap Locations

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NOTE:

Remove only the outer gasket from the manifold. Do not disassemble any of the internal components of the manifold in an attempt to remove the 8 inner sealing gaskets. If the inner gaskets are cut or damaged, replace the manifold as an assembly. Only use a wire-cutter type tool in order to minimize the amount of debris. Do not use a rotary-type cutting tool on the retaining straps.

Identify the 8 gasket retaining strap locations (1-8).

Fig 5: Retaining Strap

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Using a cutter type tool, cut the 8 retaining straps.

Fig 6: Valve Cover Outer Gasket

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Remove the outer gasket (1) from the valve lifter oil manifold.