Secondary Camshaft Drive Chain Installation - Left Side

Tools Required 

J 44212  Camshaft Holding Tool. See Special Tools .

Fig 1: Left Secondary Camshaft Drive Chain Guide
Courtesy of GENERAL MOTORS CORP.
1. Install the left secondary camshaft drive chain guide.
Fig 2: Identifying Lower Left Secondary Camshaft Drive Chain Guide Bolt
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2. Loosely install the lower left secondary camshaft drive chain guide bolt.
Fig 3: View of Left Secondary Camshaft Drive Chain Shoe
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3. Install the left secondary camshaft drive chain shoe.
Fig 4: Identifying Left Secondary Camshaft Drive Chain Shoe Bolt
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NOTE: Refer to Fastener Notice in Cautions and Notices.
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 5: View of Left Secondary Camshaft Drive Chain
Courtesy of GENERAL MOTORS CORP.
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 6: Securing Camshaft
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7. Install the left intake and exhaust camshaft sprockets into the left secondary camshaft drive chain.
Fig 7: View of Left Intake & Exhaust 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 8: Securing Camshaft
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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 sprocket bolts.
Fig 9: Ensuring Camshaft Sprocket Drive Pins Are At The Top Of Their Rotation
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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 10: Using Camshaft Holding Tool
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12. Install the J 44212  to the left cylinder head camshafts. See Special Tools .
Fig 11: Identifying Upper Left Secondary Camshaft Drive Chain Guide Bolt
Courtesy of GENERAL MOTORS CORP.
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 12: Collapsing Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS CORP.
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 13: Identifying Left Secondary Camshaft Drive Chain Tensioner to Engine Block Bolts
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.