Tools Required

J 36660-A  Torque Angle Meter

1. Ensure that the left secondary timing chain tensioner (1) is being installed.
   Fig 1: Checking For Left Secondary Timing Chain Tensioner Installation

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2. Compress the left secondary timing chain tensioner shoes with your hand.
3. Lock the left secondary timing chain tensioner by inserting a piece of wire (2) into the access hole in the side of the left secondary timing chain tensioner (1).
4. Slowly release pressure on the left secondary timing chain tensioner shoes. The left secondary timing chain tensioner should remain compressed.
   Fig 2: Locking Left Secondary Timing Chain Tensioner

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5. Position the secondary timing chain tensioner between the camshafts.
   CAUTION: Refer to in FASTENER NOTICE .
6. Install the secondary timing chain tensioner bolts.

   Tighten 

   Tighten the secondary timing chain tensioner bolts to 12 N.m (106 in lbs).

   Fig 3: Installing Timing Chain Tensioner

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7. Wrap the secondary timing chain around both secondary drive sprockets.
8. Align the exhaust sprocket drive pin (1) between with the two darkened links (2).
9. Align the intake sprocket drive pin (4) with the single darkened link (3).
   Fig 4: Aligning Exhaust & Intake Sprocket Drive Pins

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10. Fit the intake and exhaust camshaft sprockets with the secondary timing chain onto their respective camshafts and align the drive pins in the camshafts.
11. Install the camshaft sprocket bolts.

    Tighten 

    1. 11.1. Tighten the camshaft sprocket bolts to 25 N.m (18 ft lbs).
    2. 11.2. Tighten the camshaft sprocket bolts an additional 45 degrees using the J 36660-A. 
12. Remove the locking wire from the secondary timing chain tensioner allowing the tensioner shoes to expand and apply pressure to the timing chain.
    Fig 5: Installing Camshaft Sprocket Bolts

    Courtesy of GENERAL MOTORS CORP.