Removal Procedure

WARNING: This page is about a different variant/trim than selected.

Remove the right secondary timing chain. Refer to Secondary Camshaft Drive Chain Replacement - Right Side .

Fig 1: Identifying Primary Timing Gear Alignment Marks

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Using the J 39946 , rotate the crankshaft until the primary timing gear alignment marks (1) are adjacent to each other as shown.
Remove the left camshaft position actuator housing. DO NOT remove the actuator solenoids from the housing. Refer to Camshaft Position Actuator Housing Replacement - Left Side .

Fig 2: View Of Special Tool & Camshafts (Rear Of Head)

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CAUTION: Refer to Camshaft Holding Tool Caution .

Fig 3: View Of Left Secondary Timing Chain Tensioner & Bolts

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Loosen and remove the left secondary timing chain tensioner bolts and tensioner. Refer to Secondary Camshaft Drive Chain Tensioner Replacement - Left Side .

Fig 4: Holding Camshaft In Position

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Use an open-end wrench on the hex cast into the camshaft in order to prevent the camshaft from rotating when removing the camshaft oil control valve.
Loosen and remove the bank 2 (left) exhaust camshaft position oil control valve.
Slide the left exhaust camshaft position actuator off of the camshaft and remove the secondary timing chain from the camshaft actuator teeth.

Fig 5: Holding Camshaft

Courtesy of GENERAL MOTORS CORP.

Use an open-end wrench on the hex cast into the camshaft in order to prevent the camshaft from rotating when removing the camshaft oil control valve.
Loosen and remove the bank 2 (left) intake camshaft position oil control valve.
Slide the left intake camshaft position actuator off of the camshaft and remove the secondary timing chain from the camshaft actuator teeth.
Remove the left secondary timing chain from the engine.
Clean and inspect the camshaft timing drive components. Refer to Camshaft Timing Drive Components Cleaning and Inspection .