Removal Procedure
- Remove the engine sight shield. Refer to Engine Sight Shield Replacement .
- Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
- Remove the throttle body assembly. Refer to Throttle Body Assembly Replacement .
- Remove the camshaft housing. Refer to Camshaft Housing Replacement .
- Remove the crankshaft pulley. Refer to Crankshaft Pulley Replacement .
- Lower the vehicle. Refer to Lifting and Jacking the Vehicle .
- NOTE:
To locate the correct camshaft sprocket bolt (2) check the TDC position.
Check if the bores (1) are aligned.
- Raise the vehicle.
Install the 4 crankshaft pulley bolts (1).
- Rotate the crankshaft 360 degrees in direction of arrow. Use a pry bar.
- Lower the vehicle.
- NOTE:
Cover the timing case with a lint-free cloth.
Remove the camshaft sprocket bolt (2) from the intake camshaft sprocket (1), counterhold with a wrench at the camshaft hexagon.
- Raise the vehicle.
Rotate the crankshaft 360 degrees in direction of arrow. Use a pry bar at the 4 crankshaft pulley bolts (1).
- Remove the 4 crankshaft pulley bolts (1).
Install the EN-51140 fixing tool (2).
- Install the fixing pin into the engine block bore (1) and tighten the 2 bolts (3).
- Lower the vehicle.
- NOTE:
Cover the timing case with a lint-free cloth.
Remove the camshaft sprocket bolt (2) from the camshaft sprocket (1), counterhold with a wrench at the camshaft hexagon.
Install the EN-51188 fixing tool (2) to fix the camshaft sprocket (1).
- Install the 2 bolts (3).
- NOTE:
Cover the timing case with a lint-free cloth.
Remove the camshaft sprocket bolt (2) from the camshaft sprocket (1), counterhold with a wrench at the camshaft hexagon.
- NOTE:
Do not move the camshaft sprocket onto the EN-51188 fixing tool if the intake camshaft was removed.
Slide the camshaft sprocket (1) over the pin (2) of the EN-51188 fixing tool in arrow direction.
Remove the 4 camshaft bearing rear cap bolts (1).
- Remove the camshaft bearing rear cap (2).
Install the EN-50509 fixing tool (1) to the exhaust camshaft sprocket (2).
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Courtesy of GENERAL MOTORS COMPANY
Loosen the 8 exhaust camshaft bearing cap bolts in sequence as shown.
Remove the 8 exhaust camshaft bearing cap bolts (1).
- Remove the 4 exhaust camshaft bearing caps (2) and lay aside in the order as they was removed.
- NOTE:
If the exhaust camshaft are reinstall, do not remove the EN-50509 fixing tool.
Remove the exhaust camshaft (1).