Intake Camshaft Installation

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

Lubricate and install the hydraulic valve lash adjusters (1) into their bores in the cylinder head. Refer to Adhesives, Fluids, Lubricants and Sealers .

Fig 1: Hydraulic Lash Adjusters
Courtesy of GENERAL MOTORS COMPANY

NOTE: Pre-fill the low pressure chamber with engine oil. Maintain a vertical orientation of the assembly to retain the oil in the reservoir and high pressure chamber. Do not install the lash adjusters without pre-filling the low pressure chamber. Apply engine oil to the outer diameter surface of all adjusters.
Lubricate the valve tips. Refer to Adhesives, Fluids, Lubricants and Sealers .

Fig 2: Valve Tips
Courtesy of GENERAL MOTORS COMPANY
Lubricate the roller bearings with valve rocker arm lubricant. Refer to Adhesives, Fluids, Lubricants and Sealers .

Fig 3: Intake Camshaft Roller Finger Followers
Courtesy of GENERAL MOTORS COMPANY

NOTE: Used rocker arms must be returned to the original position on the camshaft. If the camshaft is being replaced, the rocker arms actuated by the camshaft must also be replaced.

NOTE: Pre-oil roller bearings before installation.
Position the valve rocker arm (1) on the tip of the valve stem and on the lash adjuster and lubricate. Refer to Adhesives, Fluids, Lubricants and Sealers .
Lubricate the intake camshaft lobes and journals with camshaft lubricant. Refer to Adhesives, Fluids, Lubricants and Sealers .
Set the intake camshaft (3) on top of the roller followers in the camshaft bearing journals with the intake actuator timing mark at approximately the 11 O'clock position.

Fig 4: Intake Camshaft Bearing Rear Cap Bolts And Cap
Courtesy of GENERAL MOTORS COMPANY

NOTE: Apply lubricant to all lobes and journals prior to installing the camshafts.
Install the camshaft cap bolts (1) into the camshaft caps (2, 4).
NOTE: To properly position the camshaft caps, install the camshaft cap bolts into the camshaft caps prior to installing the camshaft caps on the camshafts.
Install the camshaft caps (2) and hand start the camshaft cap bolts (1).
Install the camshaft rear cap (4) and hand start the camshaft cap bolts (1).
Tighten the camshaft cap bolts in sequence using the following procedure:

Fig 5: Camshaft Cap Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY

CAUTION: Refer to Fastener Caution .

NOTE: During the tightening sequence, locate and tighten each camshaft cap bolt installed into the circular hole first. Then, tighten the bolt installed into the slotted hole.
1. Tighten the camshaft cap bolts in sequence to 8 N.m (71 lb in).
2. Loosen both bolts in each cap in sequence to 180 degrees.
3. Tighten the camshaft cap bolts in sequence to 10 N.m (89 lb in) twice.
Install the front camshaft bearing cap (1). Install the 2 outer bolts (5) for the front camshaft bearing cap finger tight.

Fig 6: Front Camshaft Bearing Cap
Courtesy of GENERAL MOTORS COMPANY

NOTE: Installation of the timing chain guide (2) and bolts (3, 4) and final torque for the front bearing cap is performed after the timing chain is installed.