Camshaft Timing Chain Inspection

Special Tools

• EN-952  Fixing Pin
• EN-953-A  Fixing Tool
• EN-49977-100  Transmitter Disc Fixation

For equivalent regional tools, refer to Special Tools .

1. Remove the ignition coil. Refer to Ignition Coil Replacement .
2. Remove the camshaft cover. Refer to Camshaft Cover Replacement .
3. Remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement
   Fig 1: Bore And Mark

   Courtesy of GENERAL MOTORS COMPANY
4. Remove the front compartment insulator. Refer to Front Compartment Insulator Replacement
5. Set the crankshaft balancer in the direction of the engine rotation to "1st cylinder TDC", for this rotate the engine clockwise until the bore (2) in the crankshaft balancer aligns with the mark (1) on the engine front cover.
6. Examine that the camshaft grooves (1) are visible as shown. If the camshaft grooves are not visible rotate the crankshaft 360°.
   Fig 2: Camshaft Grooves

   Courtesy of GENERAL MOTORS COMPANY
7. Remove the crankshaft bearing cap tie plate hole plug (2) and the seal ring (1).
   Fig 3: Crankshaft Bearing Cap Tie Plate Hole Plug And Seal Ring

   Courtesy of GENERAL MOTORS COMPANY
8. Install EN-952  fixing pin (1) to hold the crankshaft in "1st cylinder TDC" position.
   Fig 4: Fixing Pin

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: To ensure proper crankshaft top dead center (TDC) alignment, the retention pin should fit easily through the bore in the crankshaft tie plate and into the crankshaft. Binding of the retention pin could affect proper engine timing.
9. Install EN-953-A  fixing tool (1) to the camshafts.
   Fig 5: Fixing Tool

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The fixing tool should be installed completely to both camshaft grooves without high effort.
10. Install EN-49977-100  transmitter disc fixation (1) to inspect the correct position of the camshaft position exciter wheels.
    Fig 6: Transmitter Disc Fixation Tool And Bolts

    Courtesy of GENERAL MOTORS COMPANY
    NOTE: A wrong installation position is possible. Make sure that the fixation tool is installed without clearance to the cylinder head in areas (3) and (4).
11. Tighten the bolts (2) of EN-49977-100  transmitter disc fixation.
12. If EN-953-A  fixing tool or EN-49977-100  transmitter disc fixation can not be installed, refer to Camshaft Timing Chain Adjustment .
13. Remove EN-49977-100  transmitter disc fixation.
14. Remove EN-953-A  fixing tool.
15. Remove EN-952  fixing pin.
16. Install crankshaft bearing cap tie plate hole plug and seal ring and tighten to 40 N.m (30 lb ft).
    CAUTION: Refer to Fastener Caution .
17. Install the front compartment insulator. Refer to Front Compartment Insulator Replacement
18. Install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement
19. Install the camshaft cover. Refer to Camshaft Cover Installation .
20. Install the ignition coil. Refer to Ignition Coil Installation .