Camshaft, Engine: Installation: Left

Fig 1: Magnetic Timing Wheels

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CAUTION:

The magnetic timing wheels (1) must not come in contact with magnets (pickup tools, trays, etc.) or any other strong magnetic field. This will destroy the timing wheels ability to correctly relay camshaft position to the camshaft position sensor.

Fig 2: Bearing Cap Retaining Bolts Tightening Sequence - Left

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Lubricate the camshaft journals with clean engine oil.
CAUTION:
Do not rotate the camshafts more than a few degrees independently of the crankshaft. Valve to piston contact could occur resulting in possible valve damage. If the camshafts need to be rotated more than a few degrees, first move the pistons away from the cylinder heads by rotating the crankshaft counterclockwise to a position 30° before-top-dead-center. Once the camshafts are returned to their top-dead-center position, rotate the crankshaft clockwise to return the crankshaft to top-dead-center.
Install the left side camshaft(s) with the alignment holes (1) positioned approximately 30° before top-dead-center. This will place the camshafts at the neutral position (no valve load) easing the installation of the camshaft bearing caps.
Caps are identified numerically (1 through 4), intake or exhaust (I or E) and should be installed from the front to the rear of the engine. All caps should be installed with the notch forward so that the stamped arrows (<) on the caps point toward the front of the engine.
Verify the rocker arms are aligned to the cam lobe. Refer to ROCKER ARM, VALVE, INSTALLATION .
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Install the camshaft bearing caps and hand tighten the retaining bolts to the proper specification. Refer to TORQUE SPECIFICATIONS .
Tighten the bearing cap retaining bolts in the sequence shown in illustration to the proper specification. Refer to TORQUE SPECIFICATIONS .

Fig 3: Positioning Camshaft Alignment Holes Vertically
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Rotate the camshafts clockwise to top-dead-center by positioning the alignment holes (1) vertically.
Install the timing chain tensioner holder.

Fig 4: Marks On Timing Chain
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NOTE:
Minor rotation of a camshaft (a few degrees) may be required when installing the LT Camshaft/Phasers to the camshaft alignment pins.
Verify the cam phasers are aligned with the marks (2) made on the timing chain.
Install the camshaft phasers onto the camshafts.

Fig 5: Arrows, Scribe Lines & Cylinder Head Cover Mounting Surface
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Using care, slowly rotate the engine four revolutions to verify the valve to piston clearance and camshaft phaser timing mark alignment (1).
Install the cylinder head cover, spark plugs, ignition coils and the upper intake manifold. Refer to ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, INSTALLATION .

NOTE:

The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.