Removal Procedure

Open the hood.
Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
Remove the camshaft cover. Refer to Camshaft Cover Replacement .
Remove the 2 camshaft position actuator solenoid valves. Refer to Camshaft Position Actuator Solenoid Valve Removal .
Adjust the engine to TDC. Refer to Camshaft Timing Chain Inspection .
Remove the timing chain tensioner plug (1) from the engine front cover.

Fig 1: Timing Chain Tensioner Plug
Courtesy of GENERAL MOTORS COMPANY
Install a wrench (1) to the hexagon of the intake camshaft and rotate it in direction of the arrow in order to apply tension to the timing chain and hold.

Fig 2: Hexagonal Wrench Rotation Direction
Courtesy of GENERAL MOTORS COMPANY
Install the EN-955-10 pin (2) to the timing chain tensioner bore (1) to secure it in place.

Fig 3: Timing Chain Tensioner Bore And Pin
Courtesy of GENERAL MOTORS COMPANY
Remove the wrench from the intake camshaft.
Remove the 2 upper timing chain guide bolts (1).

Fig 4: Upper Timing Chain Guide And Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove the upper timing chain guide (2).
Loosen the intake camshaft sprocket bolt (2) while holding the hexagon of the intake camshaft with a wrench (1).

Fig 5: Intake Camshaft Sprocket Bolt And Hexagonal Wrench
Courtesy of GENERAL MOTORS COMPANY
Loosen the exhaust camshaft sprocket bolt while holding the hexagon of the exhaust camshaft with a wrench.
Remove the 2 camshaft sprocket bolts (2) and the 2 camshaft position exciter wheels (1).

Fig 6: Camshaft Position Exciter Wheels And Camshaft Sprocket Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove the 2 camshaft sprockets (2) along with the timing chain (1) and place it in the engine front cover.

Fig 7: Timing Chain And Camshaft Sprockets
Courtesy of GENERAL MOTORS COMPANY
Remove the exhaust camshaft sprocket.