Rear Compartment Lid Lock Cylinder

Fig 1: Identifying Rear Compartment Lid Lock Cylinder Components (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

The rear compartment lid lock cylinder uses 8 of the 10 key cut positions, 3-10 when counting from the key head. The tumbler orientations alternate in adjacent locations from side to side with 4 on each side.

NOTE: The rear compartment lid lock cylinder tumblers (3) are not self-retaining and must be held in place if the key is not fully inserted into the lock cylinder or until the cylinder (1) is assembled into the case (4).
1. Hold the uncoded cylinder (1) positioned so the side with the drain hole is facing downward.
2. Insert one tumbler spring (2) each into the 4 tumbler spring holes.
3. The first tumbler to be loaded will be key cut position number 3, the third number in the key code. Determine the cut depth at this position and install the corresponding tumbler (3) into the tumbler slot nearest the front of the cylinder (1), the end where the key is inserted.
4. In the same manner, determine the cut depth and corresponding tumbler and install the 3 remaining tumblers (3) into the tumbler slots located at key cut positions 5, 7, and 9.
5. Check for correct loading by holding the tumblers (3) in position and fully inserting the matching key into the cylinder (1). All tumblers should be flush with the outside diameter of the cylinder.
6. Rotate the cylinder (1) so that the side with the drain hole is facing upward and then remove the matching key. Remember the tumblers (3) are not self-retaining and must be held in place.
7. Insert one tumbler spring (2) each into the 4 tumbler spring holes.
8. The first tumbler to be loaded will be key cut position number 4. Determine the cut depth at this position and install the corresponding tumbler (3) into the open tumbler slot nearest the front of the cylinder.
9. In the same manner, determine the cut depth and corresponding tumbler and install the 3 remaining tumblers into the tumbler slots located at key cut positions 6, 8, and 10.
10. Check for correct loading by holding the tumblers (3) in position and fully inserting the matching key into the cylinder (1). All tumblers should be flush with the outside diameter of the cylinder.
11. Lightly lubricate tumbler (3) surfaces using the lubrication provided.
12. With the matching key fully inserted into the coded cylinder, install the coded cylinder into the case (4).
13. Remove the matching key being careful to keep the coded cylinder (1) fully inserted into the case (4).
14. Insert one shutter spring (5) each into the 2 shutter spring holes located on the front face of the cylinder (1).
15. Install the shutter assembly (6) into the recessed area on the front face of the cylinder (1). Be sure that the ends of the pin on the shutter assembly are positioned in the pin cavities located in the front face of the cylinder.
Fig 2: Identifying Rear Compartment Lid Lock Cylinder Components (2 Of 2)
Courtesy of GENERAL MOTORS CORP.