Timing Belt Removal

Special Tools

• EN-956-1  Extension
• EN-46788  Crankshaft Fixing Tool
• EN-46789  Camshaft Locking Tool
• EN-47634  Camshaft Sprocket Holding Tool

For equivalent regional tools, refer to Special Tools .

1. Set the cylinder one to TDC:
   Fig 1: Locking Tool

   Courtesy of GENERAL MOTORS COMPANY
   NOTE:

   • Check condition of timing belt for signs of damage to help determine the root cause of the failure.
   • The timing belt cannot be reused if the timing belt has any failure described in and/or if any sprocket, idler, tensioner or the water pump is damaged.
   • Avoid the contact with cooling fluid and oil, it will damage the timing belt. A damaged timing belt can not be reused.
   1. Remove the camshaft housing closure bolt.
   2. Install the EN-46789  locking tool (1) in the camshaft housing.
   3. Turn the engine clockwise until the EN-46789  locking tool audibly engages.
2. Remove the oil pump bolt (1).
   Fig 2: Oil Pump Bolt

   Courtesy of GENERAL MOTORS COMPANY
3. Install the fixing tool stud (1) of the EN-46788  fixing tool.
   Fig 3: Identifying Fixing Tool Stud

   Courtesy of GENERAL MOTORS COMPANY
4. Lock the crankshaft, using the EN-46788  fixing tool (1).
   Fig 4: Identifying EN-46788 Fixing Tool

   Courtesy of GENERAL MOTORS COMPANY
5. Mark the position of the timing belt tensioner indicator (2), see arrows in picture, use a pen (1) or a suitable tool.
   Fig 5: Identifying Timing Belt Tensioner Indicator

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: If the timing belt will be reused, mark the position of the timing belt tensioner indicator, as shown in picture before you loosen any bolt.
6. Loosen the camshaft sprocket (1).
   Fig 6: Identifying Camshaft Sprocket, EN-47634 Holding Tool And EN-956-1 Extension

   Courtesy of GENERAL MOTORS COMPANY
   1. Install the EN-47634  holding tool (2) to the camshaft sprocket (1).
   2. Hold up with the EN-956-1  extension (3) and loosen the camshaft sprocket bolt.
7. Remove the EN-47634  holding tool and the EN-956-1  extension.
8. Release tension to the timing belt tensioner.
   Fig 7: Timing Belt Tensioner Nut

   Courtesy of GENERAL MOTORS COMPANY
9. Loosen the timing belt tensioner bolt (2).
10. Remove the EN-46788  fixing tool.
NOTE:
• Do not damage the timing belt. A damaged timing belt can not be reused.
• If the timing belt will be reused, mark the direction of timing belt rotation.
11. Remove the timing belt (1).