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Chevrolet Sonic Repair Manual: Camshaft Timing Chain Inspection

Chevrolet Sonic Repair Manual / Powertrain / Engine / Valvetrain / Valvetrain Timing / Camshaft Timing Chain Inspection

Special Tools

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
  4. Rotate the engine clockwise until the bore (2) in the crankshaft balancer aligns with the mark (1) on the engine front cover.

  5. Examine that the camshaft grooves (1) are visible as shown. If the camshaft grooves are not visible rotate the crankshaft 360°.

  6. Remove the crankshaft bearing cap tie plate hole plug (2) and the seal ring (1).

    7. 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.

  7. Install EN-952 fixing pin  (1) to hold the crankshaft in TDC position.


    8. Note:

    The fixing tool should be installed completely to both camshaft grooves without high effort.

  8. Install EN-953-A fixing tool  (1) to the camshafts.


    9. 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).

  9. Install EN-49977-100 transmitter disc fixation  (1) to inspect the correct position of the camshaft position exciter wheels.
  10. Tighten the bolts (2) of EN-49977-100 transmitter disc fixation .
  11. If EN-953-A fixing tool or EN-49977-100 transmitter disc fixation can not be installed, refer to Camshaft Timing Chain Adjustment.
  12. Remove EN-49977-100 transmitter disc fixation .
  13. Remove EN-953-A fixing tool .
  14. Remove EN-952 fixing pin .

    15. Caution:

    Refer to Fastener Caution.

  15. Install crankshaft bearing cap tie plate hole plug and seal ring and tighten to 40 Y (30 lb ft)

    .

  16. Install the right front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement
  17. Install the camshaft cover. Refer to Camshaft Cover Installation.
  18. Install the ignition coil. Refer to Ignition Coil Installation.
Camshaft Timing Chain Adjustment
Special Tools EN-952 Fixing Pin EN-953–A Fixing Tool EN-49977?E00 Fixation Sensor Discs For equivalent regional tools, refer to Special Tools. Remove the ignition coil. Refer to Ign ...

Camshaft Timing Chain Installation
Special Tools EN-952 Fixing Pin EN-953-A Fixing Tool EN-955-10 Fixing Pin from EN-955 Kit For equivalent regional tools, refer to Special Tools. The engine should be adjusted to TDC. ...

Other materials:

Front Wiper Blade Replacement
Windshield wiper blades should be inspected for wear or cracking. See the Maintenance Schedule  for more information. Replacement blades come in different types and are removed in different ways. For proper windshield wiper blade length and type, see Maintenance Replacement Parts. Caution ...

Communication Interface Module Bracket Replacement
Communication Interface Module Bracket Replacement Callout Component Name Preliminary Procedure Remove the instrument panel lower compartment. Refer to Instrument Panel Lower Compartment Replacement 1 ...

Air Cleaner Element Replacement
Removal Procedure Disconnect mass air flow sensor wiring harness plug (2) from mass air flow sensor (3). Unclip mass air flow sensor wiring harness retainer clip from air cleaner housing (1). Remove the air cleaner outlet duct clamp̴ ...

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