Camshaft Timing Chain Removal

Special Tools 

EN-51148  Camshaft Holding Tool

For equivalent regional tools, refer to Special Tools .

1. Adjust the engine to top death center (TDC). Refer to Camshaft Timing Chain Inspection .
2. Remove the upper timing chain guide bolts (2).
   Fig 1: Upper Timing Chain Guide

   Courtesy of GENERAL MOTORS COMPANY
3. Remove the upper timing chain guide (1).
4. Install the EN-51148  holding tool (1) to camshafts and to the cylinder head.
   Fig 2: Identifying Camshaft Holding Tool Bolts

   Courtesy of GENERAL MOTORS COMPANY
5. Tighten the bolt (3) in the middle.
6. Tighten the 2 both outer bolts (2, 4)
7. Push the timing chain guide - left side (2) in the direction of the arrow.
   Fig 3: Timing Chain Guide And Tensioner

   Courtesy of GENERAL MOTORS COMPANY
8. Fix the tensioner (1) with a suitable tool (3).
9. Remove the 2 timing chain tensioner bolts (2).
   Fig 4: Timing Chain Tensioner

   Courtesy of GENERAL MOTORS COMPANY
10. Remove the timing chain tensioner (1).
11. Remove the timing chain (1) along with the crankshaft sprocket (2) and the cam (3).
    Fig 5: Timing Chain And Crankshaft Sprocket

    Courtesy of GENERAL MOTORS COMPANY