Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Front Side Door Lock Cylinder Coding (Free Wheeling)

Chevrolet Sonic Repair Manual / Body / Doors and Enclosures / Doors / Front Side Door Lock Cylinder Coding (Free Wheeling)

Special Tools

BO-49753 Assembly Tool


The door lock cylinder uses 8 of the 8?€‰cut positions. The tumbler positions

The door lock cylinder uses 8 of the 8?€‰cut positions. The tumbler positions are staggered from side to side, 4 on one side and 4 on the other, are not self-retaining, and are not snap in.

    Note:

    All lock cylinders for side milled keys have right and left tumblers. The location of the tooth of the tumbler determines whether it is right of left. Illustrations in this procedure show the right tumblers on the top and the left tumblers on the bottom. All tumblers are marked 1R, 1L, 2R, or 2L. The number being cut depth and the letter meaning right or left.

  1. Hold the door lock cylinder?€‰(1) so the side with the 4?€‰tumbler spring pockets faces up, pocket nearest to the cylinder head.
  2. Insert the tumbler springs?€‰(2) into the 4?€‰spring pockets. This side uses left tumblers.
  3. Install the tumbler?€‰(3) for key cut position one in the slot nearest to the front of the lock cylinder. Install the remaining tumblers, key cut positions 3, 5, and 7, following the key code and same process. Press the tumblers in place until they are secure.
  4. Check the correct loading of the tumblers by inserting the key into the cylinder. All tumblers should be flush with the lock cylinder body.
  5. Turn the cylinder so the side with the 4?€‰tumbler spring wells faces up. This side uses right tumblers.
  6. Insert the tumbler springs into the 4?€‰spring pockets.
  7. The first tumbler closest to the front of the lock cylinder to be loaded will be the second key cut position, the second number in the key code. Install the remaining tumblers for the key cut positions 4, 6, and 8. Press the tumblers in place until they are secure.
  8. Check the correct loading of the tumblers by inserting the key into the cylinder. All tumblers should be flush with the lock cylinder body.
  9. Insert the key and lightly lubricate the cylinder body diameter and tumbler surfaces and a small amount in the head of the cylinder using the supplied grease.
  10. Insert the sleeve?€‰(4) onto the cylinder assembly.
  11. Insert the clutch?€‰(5) and driver?€‰(6) onto the cylinder?€‰(1).

  12. Load the cylinder into the BO-49753 assembly tool so that the clutch?€‰(1) indexes with the notch in the opening of the tool?€‰(2).


  13. Load the assembly tool with the lock cylinder into a vice and tighten the vice ONLY enough to hold the tool and lock the cylinder in place.

  14. Insert the roll pin?€‰(7) into the driver?€‰(6) and install it using a 1/16?€‰inch pin punch.
  15. Insert the buffer?€‰(8) in the case?€‰(9), verify the buffer is properly seated.
  16. Install the free wheel pin?€‰(11) in the sleeve?€‰(4) and clutch?€‰(5) and insert the assembly into the case?€‰(9).
  17. With the lock cylinder assembly installed in the case?€‰(9), install the retainer?€‰(10) and stake the retainer in place using a small punch and hammer to peen the case material onto the exposed ends of the installed retainer?€‰(10).
  18. Insert the key into the lock and function the lock to check for proper assembly and smooth operation.
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