Removal Procedure

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

Camshaft Cover Replacement - Remove
Engine Mount Bracket Replacement - Remove
Front Wheelhouse Liner - Right Side - Remove Front Wheelhouse Liner Replacement
Adjust the engine to cylinder 1 top dead center (TDC) of combustion stroke. Set crankshaft in direction of engine rotation until the markings (2) and (3) line up. Rotate at the crankshaft balancer absorber bolt (1).

Fig 1: Crankshaft Balancer Alignment Marks
Courtesy of GENERAL MOTORS COMPANY
Lower the vehicle.
Install the EN-51148 holding tool (1) to camshafts and to the cylinder head.

Fig 2: Identifying Camshaft Holding Tool Bolts
Courtesy of GENERAL MOTORS COMPANY

NOTE: If EN-51148 holding tool does not fit properly, rotate the crankshaft and additional 360 degrees.
1. Tighten the bolt (3) in the middle.
2. Tighten the 2 outer bolts (2, 4).
Engine Front Cover Replacement - Upper - Remove
Timing Chain Upper Guide Replacement - Remove
Mark the camshaft timing chain with a suitable permanent marker or paint stick in line to the camshaft position actuator adjuster marks (1, 2).

Fig 3: Camshaft Position Actuator Adjuster Marks
Courtesy of GENERAL MOTORS COMPANY
Push the timing chain guide - left side (2) in the direction of the arrow.

Fig 4: Timing Chain Guide And Tensioner
Courtesy of GENERAL MOTORS COMPANY
Fix the tensioner (1) with a 2 mm drill bit or equivalent (3).
Timing Chain Tensioner Replacement - Remove
Remove the camshaft timing chain (2) from the camshaft position actuator adjuster.

Fig 5: Camshaft Timing Chain And Timing Chain Guides
Courtesy of GENERAL MOTORS COMPANY
Lay the camshaft timing chain (2) between the timing chain guides (1, 3).
Remove the camshaft position actuator adjuster bolt (3).

Fig 6: Exhaust Camshaft Position Actuator
Courtesy of GENERAL MOTORS COMPANY
Remove the exhaust camshaft position actuator (1).
Loosen the EN-51148 holding tool bolts (2, 3, 4).

Fig 7: Identifying Holding Tool Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove the EN-51148 holding tool (1).
Loosen the 12 exhaust camshaft bearing cap bolts (1) in sequence shown, working from outside to inside in a spiral in steps of 1/2 up to 1 turn.

Fig 8: Exhaust Camshaft Bearing Cap Bolts
Courtesy of GENERAL MOTORS COMPANY

NOTE: Mark or identify each crankshaft bearing cap location and direction before removal.
Remove the 12 exhaust camshaft bearing cap bolts (2).

Fig 9: Exhaust Camshaft
Courtesy of GENERAL MOTORS COMPANY
Remove the exhaust bearing front cap (3) from the cylinder head.
Remove the 5 exhaust camshaft bearing caps (4) from the cylinder head.
Remove the exhaust camshaft (1).