Which of the following is a cause of cylinder head gasket leakage related to installation practices?

• A. Reusing a permanently compressed gasket
• B. Improper installation
• C. Installing a damaged or defective gasket
• D. Improper torque of the cylinder head

Answer: (B)

When a cylinder head gasket leaks due to installation practices, the leak stems from not following the proper assembly procedure. The gasket must be seated evenly on clean, true surfaces, with the correct orientation, and the cylinder head must be torqued in the specified sequence and to the correct final values. If any part of that process is done incorrectly—such as misalignment, contaminated sealing surfaces, or improper torque—the gasket cannot seal properly and leaks can occur.

This option is the best because it points to the general act of how the gasket is installed, which directly governs whether it seals. The other options describe problems with the gasket itself or a single aspect of installation, but they don’t capture the broader issue of improper installation practice as the root cause of leaks.