Timing Belt Installation

Special Tools

• EN-6333  Locking Pin
• EN-6340  Locking Tool

For equivalent regional tools, refer to Special Tools .

1. Turn the crankshaft in the direction of engine rotation, by the crankshaft balancer bolt, to cylinder 1 TDC of combustion stroke.
   Fig 1: Aligning Timing Belt Drive Gear And Oil Pump Housing

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The timing belt drive gear and oil pump housing must align.
2. Prepare the right half of the EN-6340  locking tool.
   Fig 2: Front Panel And Bolts

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The right half of the EN-6340  locking tool can be recognized by the lettering right, arrow, on the tool.
   1. Remove the 2 bolts (2).
   2. Detach the front panel (1) from the EN-6340  locking tool - right.
3. Insert the EN-6340  locking tool - left (1) and the EN-6340  locking tool - right (2) in the camshaft adjuster.
   Fig 3: Spot Type Markings And Locking Tool

   Courtesy of GENERAL MOTORS COMPANY
   NOTE:

   • The spot type marking (4) on the intake camshaft adjuster does not correspond to the groove of the EN-6340  locking tool - left (1) during this process, but must be somewhat above.
   • The spot type marking (3) on the exhaust camshaft adjuster must correspond to the groove on EN-6340  locking tool - right (2).
4. Insert the timing belt (1).
   Fig 4: Timing Belt, Timing Belt Tensioner

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Observe direction of rotation.
5. Apply tension to the timing belt tensioner (2) in the direction of the arrow, using an Allen key (1).
   Fig 5: Drive Belt Tensioner, Allen Key And Locking Pin

   Courtesy of GENERAL MOTORS COMPANY
6. Remove the EN-6333  locking pin (3).
7. Release tension on timing belt tensioner.
   NOTE: The timing belt tensioner moves automatically to the correct position.
8. Remove the EN-6340  locking tool.
9. Check position of the camshaft sprocket.
   1. Turn crankshaft 720° in the direction of engine rotation by the crankshaft balancer bolt.
   2. Insert EN-6340  locking tool into camshaft sprockets.
      NOTE: Note the marking on the camshaft sprocket.
10. Check the crankshaft position.
    Fig 6: Aligning Timing Belt Drive Gear And Oil Pump Housing

    Courtesy of GENERAL MOTORS COMPANY
    NOTE: The timing belt drive gear and oil pump housing must align.