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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:

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Rear Bumper Fascia Outer Guide Replacement Callout Component Name Warning: Refer to Eye Protection Warning. Preliminary Procedure Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement. ...

Tires and Wheels Description and Operation (Equipment)
GM Recommended Tire Balancer Hunter RF33 Road Force balancer or equivalent with the following options: Auto Clamp – allows for centering repeatability and prevent damage to the wheel. Wheel Lift – helps prevent wheel damage and assists in the accuracy of the placeme ...

Control Valve Body Cleaning and Inspection (Gen 2)
Control Valve Body Cleaning and Inspection Callout Component Name Warning: Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result. Caution: After cle ...

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