Secondary Camshaft Drive Chain Installation - Left Side - Off Vehicle

Tools Required 

EN 46328  Camshaft Holding Tool. See Special Tools .

Fig 1: View Of Left Secondary Camshaft Drive Chain Guide
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1. Install the left secondary camshaft drive chain guide.
2. Loosely install the lower left secondary camshaft drive chain guide bolt.
Fig 2: View Of Left Secondary Camshaft Drive Chain Shoe
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3. Install the left secondary camshaft drive chain shoe.
NOTE: Refer to Fastener Notice .
4. Install the left secondary camshaft drive chain shoe bolt.

   Tighten:  Tighten the left secondary camshaft drive chain shoe bolt to 25 N.m (18 lb ft).

Fig 3: View Of Left Secondary Camshaft Drive Chain
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5. Install the left secondary camshaft drive chain by sliding the chain down through the left cylinder head and placing the chain on the end of the camshafts.
6. Route the left secondary camshaft drive chain around the inner row of the intermediate drive chain sprocket teeth.
Fig 4: View Of Left Camshaft Position Actuators
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7. Install the left intake and exhaust camshaft position actuators into the left secondary camshaft drive chain.
Fig 5: View Of Left Camshaft Sprockets
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8. Install the left intake and exhaust camshaft sprockets onto the camshafts. The camshaft sprocket notch marked "LI" which indicates left intake, engages the intake camshaft pin and the camshaft sprocket notch marked "LE" which indicates left exhaust, engages the exhaust camshaft pin.
Fig 6: Aligning Left Sprocket Notch To Camshaft Pin
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9. If necessary, use an open wrench on the hex cast near the front of each camshaft to help align the sprocket notch to the camshaft pin.
10. Loosely install the left intake and exhaust camshaft position actuator oil control valves.
Fig 7: Ensuring Proper Alignment Of Left Camshaft Sprocket Notches & Pins
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11. Ensure the perpendicular alignment of the left intake and exhaust camshaft sprocket notches and camshaft pins to the cylinder head.
Fig 8: View Of EN 46328 & Left Cylinder Head Camshafts
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12. Install the EN 46328  to the left cylinder head camshafts. See Special Tools .
Fig 9: View Of Upper Left Secondary Camshaft Drive Chain Guide Bolt
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13. Install the upper left secondary camshaft drive chain guide bolt.

    Tighten:  Tighten BOTH the upper and lower left secondary camshaft drive chain guide bolts to 25 N.m (18 lb ft).

Fig 10: Collapsing Primary Camshaft Drive Chain Tensioner
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14. Collapse the left secondary camshaft drive chain tensioner using the following procedure:
    1. Rotate the ratchet release lever counterclockwise and hold.
    2. Collapse the left secondary camshaft drive chain tensioner shoe and hold.
    3. Release the ratchet lever and slowly release the pressure on the shoe.
15. When the ratchet lever moves to the first detent a click should be heard and felt. Insert a pin through the hole in the release lever in order to lock the left secondary camshaft drive chain tensioner shoe in the collapsed position.
Fig 11: View Of Left Secondary Drive Chain Tensioner
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the left secondary camshaft drive chain tensioner release lever is facing out.
16. Install the left secondary camshaft drive chain tensioner.
17. Install the left secondary camshaft drive chain tensioner bolts.

    Tighten:  Tighten the left secondary camshaft drive chain tensioner bolts to 25 N.m (18 lb ft).

18. Remove pin from left secondary camshaft drive chain tensioner lever.