Binding Lock Cylinders

Applying the proper lubrication may correct the following problems in many cases:

• Binding door lock cylinders
• Sticking door lock cylinders
• Keys that are hard to insert
• Keys that are hard to remove

The recommended material for lubricating these components are (in order of preference):

• Lubricant GM P/N 12345120, Canadian P/N 726548 or the equivalent
• 5W30 motor oil
• Silicone spray GM P/N 1052276, Canadian P/N 726548 or the equivalent

Penetrating lubricants, such as GM P/N 1052949 Canadian P/N 726548 and WD-40®, are not recommended because they wash out the original lubrication. These lubricants will eventually evaporate and leave little or no lubricating material. If you use these materials in order to unfreeze or loosen the lock cylinder components, refer to steps 2 through 4 for the proper method of lubrication.

You may repair lock cylinders that freeze due to cold weather by using the following procedure:

1. Apply heat to the lock cylinder with a heat gun. Be careful not to damage the painted surfaces.
2. Hold the lock cylinder shutter open with a paper clip (or similar item). Force air into the lock cylinder using compressed air and a blow gun attachment.
3. While holding the lock cylinder shutter open, inject a small amount of lubricant (refer to the recommendations) into the lock cylinder.
4. Work the key into the lock cylinder several times. Wipe any excess lubrication residue from the key.