Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Cylinder Head Assemble

Special Tools

For equivalent regional tools, refer to Special Tools.


    Lubricate the valve stem and the valve guide with clean engine oil.
  1. Lubricate the valve stem and the valve guide with clean engine oil.
  2. Note:

    Ensure all valve train components will be installed in their original position.

  3. Install the valve (5).
  4. Install the NEW valve stem oil seal (4), using the EN-958 installer (2).
  5. Loosely install the valve spring (3) and the valve spring retainer (1).

  6. Install the EN-50717?E assembly (1) to the EN-8062 compressor (4).
  7. Install the EN-8062?E adapter (3) to the EN-8062 compressor .
  8. Install the compressor assembly to the cylinder head, so that the adapter (5) of the EN-50717?E assembly (1) contacts the valve spring retainer properly and the EN-8062?E adapter (3) contacts the valve disc (2). Prefix the EN-8062 compressor (4).


  9. Caution:

    The valve stem keys must correctly seat in the valve spring cap. Engine damage may occur by not installing properly.

  10. Apply pressure to the EN-50717?E assembly to push down the vale spring retainer (1) and compress the valve spring (3) until the valve keys (2) can be inserted. Carefully insert the valve keys then, so that they are proper installed to the valve stem grooves.
  11. Carefully release the tension from the EN-50717?E assembly .
  12. Inspect the valve keys and valve spring retainers for proper seat.
  13. Remove the compressor assembly from the cylinder head.
  14. Repeat the procedure with the remaining valves.
Cylinder Head
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Cylinder Head Cleaning and Inspection
Valve Cleaning and Inspection Warning: Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin. Note: Do not scratch the valve ste ...

Other materials:

If the Vehicle Is Stuck
Slowly and cautiously spin the wheels to free the vehicle when stuck in sand, mud, ice, or snow. If stuck too severely for the traction system to free the vehicle, turn the traction system off and use the rocking method. See Traction Control/Electronic Stability Control. Warning If the vehi ...

Collision Damage Repair
If the vehicle is involved in a collision and it is damaged, have the damage repaired by a qualified technician using the proper equipment and quality replacement parts. Poorly performed collision repairs diminish the vehicle resale value, and safety performance can be compromised in subsequen ...

Parking Brake Cable Replacement (Disc Brake)
Removal Procedure Remove the front floor console. Refer to Front Floor Console Replacement. Ensure that the parking brake lever is in the fully released position. Using ONLY HAND TOOLS, remove the adjusting nut (1) from the end of the front park brake c ...

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