Secondary Camshaft Intermediate Drive Chain Installation - Left Side

Special Tools 

EN 46328:  Camshaft Holding Tool

For equivalent regional tools, refer to Special Tools .

Fig 1: Left Secondary Camshaft Drive Chain Guide & Bolt
Courtesy of GENERAL MOTORS CORP.
1. Install the left secondary camshaft drive chain guide.
2. Loosely install the lower left secondary camshaft drive chain guide bolt.
Fig 2: Left Secondary Camshaft Drive Chain Shoe & Bolt
Courtesy of GENERAL MOTORS CORP.
3. Install the left secondary camshaft drive chain shoe.
CAUTION: Refer to Fastener Caution .
4. Install the left secondary camshaft drive chain shoe bolt and tighten to 25 N.m (18 lb ft).
Fig 3: 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 4: Left Camshaft Position Actuators
Courtesy of GENERAL MOTORS CORP.
7. Install the left intake and exhaust camshaft position actuators into the left secondary camshaft drive chain.
Fig 5: Left Camshaft Sprockets
Courtesy of GENERAL MOTORS CORP.
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
Courtesy of GENERAL MOTORS CORP.
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: Alignment Of Left Camshaft Sprocket Notches & Pins
Courtesy of GENERAL MOTORS CORP.
11. Ensure the perpendicular alignment of the left intake and exhaust camshaft sprocket notches and camshaft pins to the cylinder head.
Fig 8: Camshaft Holding Tool
Courtesy of GENERAL MOTORS CORP.
12. Install the EN 46328:  tool to the left cylinder head camshafts.
Fig 9: 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 BOTH the upper and lower left secondary camshaft drive chain guide bolts to 25 N.m (18 lb ft).

Fig 10: Collapsing 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 11: Left Secondary Drive Chain Tensioner & Bolts
Courtesy of GENERAL MOTORS CORP.
NOTE: 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 and tighten to 25 N.m (18 lb ft).
18. Remove pin from left secondary camshaft drive chain tensioner lever.