Valve Rocker Arm Cover Replacement - Left
Removal Procedure
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drain the coolant system.
Remove the intake manifold cover.
Remove the front ignition wire harness at the upper intake manifold and at the spark plugs
Remove the bypass pipe.
Disconnect the positive crankcase ventilation (PCV) vacuum hose.
6. Important: The valve rocker arm cover gasket and sealant must be carefully trimmed away from
the lower intake manifold gasket. Failure to do so will damage the lower intake manifold gasket,
causing a severe oil leak.
Remove the valve rocker arm cover bolts.
7. Important: When removing the valve rocker arm cover, ensure the gasket stays in place
attached to the cylinder head.
Remove the valve rocker arm cover. Bump the end of the valve rocker cover with the palm of your hand
or a soft rubber mallet if the cover adheres to the cylinder head.
8. Trim the valve cover and sealant away from the lower intake manifold gasket at the cylinder head
to the lower intake manifold joints (1).
9. Remove the valve cover gasket
10. Clean the sealing surface on the cylinder head with degreaser.
11. Clean the valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection.
Installation Procedure
1. Important: Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent, at the
cylinder head to the lower intake manifold joint.
Apply sealant at the cylinder head to the lower intake manifold joints (1).
2. Install a new gasket to the valve rocker arm cover. Ensure that the gasket is properly seated in
the groove of the valve rocker arm cover.
3. Install the valve rocker cover.
Important: Use an alternating criss-cross pattern when tightening the valve rocker cover bolts. Failure to
do so may result in oil leakage from the valve cover due to improper seating of the gasket.
Install the valve rocker arm cover bolts.
Tighten the bolts to 10 Nm (89 inch lbs.) .
5. Connect the PCV valve vacuum line.
6. Install the bypass pipe.
7. Install the front ignition wire harness.
8. Refill the cooling system
9. Install the intake manifold cover.
Valve Rocker Arm Cover Replacement - Right
Removal Procedure
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Disconnect the negative battery cable.
Remove the drive belt
Remove the generator.
Remove the generator bracket.
Remove the right spark plug wires.
Disconnect the vacuum hoses from the evaporative emission (EVAP) purge valve.
Remove the EVAP purge valve.
Remove the ignition coil bracket with the coils.
Remove the ignition coil bracket studs.
Remove the vacuum hose from the grommet in the right valve rocker arm cover.
11. Important: Valve rocker arm cover gasket and sealant must be carefully trimmed away from the
lower intake manifold gasket. Failure to do so will damage the lower intake manifold gasket,
causing a severe oil leak.
Remove the right valve rocker arm cover bolts.
12. Important: When removing the valve rocker arm cover, ensure the gasket stays in place
attached to the cylinder head.
Remove the valve rocker arm cover. Bump the end of the valve rocker cover with the palm of your hand
or a soft rubber mallet if the cover adheres to the cylinder head.
13. Trim the valve gasket and sealant away from the lower intake manifold gasket at the cylinder
head to lower intake manifold joints (1).
14. Remove the valve cover gasket.
15. Clean the sealing surface on the cylinder head with degreaser.
16. Clean the valve rocker arm cover.
Installation Procedure
1. Important: Apply sealant GM P/N 12378521 (Canadian P/N 88901148), or equivalent, at the
cylinder head to lower intake manifold joint.
Apply sealant at the cylinder head to lower intake manifold joints (1).
2. Install a new gasket to the valve rocker arm cover. Ensure that the gasket is properly seated in
the groove of the valve rocker arm cover.
3. Install the right valve rocker arm cover.
Important: Use an alternating criss-cross pattern when tightening the valve rocker cover bolts. Failure to
do so may result in oil leakage from the valve cover due to improper seating of the gasket.
Install the valve rocker arm cover bolts.
Tighten the bolts to 10 Nm (89 inch lbs.) .
5. Install the vacuum hose to the grommet in the right valve rocker arm cover.
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Install the ignition coil bracket studs.
Install the ignition coil bracket with coils.
Install the EVAP purge valve.
Connect the vacuum hoses to the EVAP purge valve.
Install the right spark plug wires.
Install the generator bracket.
Install the generator.
Install the drive belt
Connect the negative battery cable.