GMC chervolet camaro 1999 Service Manual page 30

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General Information
Key and Lock Cylinder Coding
Key Identification and Usage
The lock cylinder keyway is designed so that other
model keys will not enter a current model lock cylinder.
A single key is used for all locks on the vehicle.
The key identification is obtained from the
four-character key code stamped on the knockout
portion of the key head .. Knock the plugs out of the key
head after the code numbers have been recorded.
The code list, available to owners of key cutting
equipment from equipment suppliers, determines the
lock combinations from the code numbers.
If the code numbers are not available from the records
or from the knockout plug, lay. the key on the key
code diagram in order to determine the lock
combinations (the tumbler numbers and the position
arrangement). ·
Cutting Keys
2
65495
After the code has been determined from the code list
or the key code diagram, perform the following steps:
1. Cut a blank key to the proper 1.evel (1) of each
of the tumbler positions (2).
2. Inspect the key operation in the lock cylinder.
General Information 0-27
Replacement Lock Cylinders
New lock cylinders (except ignition lock cylinders) are
available from the service parts warehouse with
new lock cylinder tocking bars. The tumblers are also
available and must be assembled into the cylinder
as recommended. For additional information, refer to
the following.
Lock Cylinder Tumbler Operation
All lock tumblers are shaped alike with the exception
of the notched position on one side. As the key is
inserted into the lock cylinder, the tumblers are
lowered to the correct height so that the notches on
each tumbler are at the same level. When the notches
on all six tumblers line up, two small springs push
the side bar into the notches, allowing the cylinder to
turn in the cylinder bore. Five types of tumblers
are used in making the lock combinations, and each
tumbler is coded and stamped with a number
between 1 and 5.
Assembling and Coding Ignition Lock
Cylinders
Tools Required
J 41340 Lock Cylinder Staking and Holding Fixture
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1. Determine the tumbler numbers/arrangement:
1.1. Place the tip of the key directly over the
tip of the illustrated key.
65496
1.2. Inspect that the diagram outlines the key.
1.3. Starting with position 1 (open end of
cylinder), find and record the lowest
level (tumbler number) that is visible.
1.4. Repeat the previous step for positions 2-10.