Impala V8-5.3L (2008)
Important: 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
