Which of the following is a cause of cylinder head gasket leakage due to a damaged component?

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

Answer: (C)

A damaged component directly interrupts the seal. When the cylinder head gasket is damaged or defective, it cannot properly seal between the engine block and the cylinder head, so compression gases, coolant, or oil can leak past the gasket. This is why installing a damaged or defective gasket is the direct cause of gasket leakage.

Other factors describe issues with how the gasket is installed or clamped, which can also lead to leaks but not because the gasket itself is damaged. Improper installation or incorrect torque can deform sealing surfaces or leave gaps, causing leaks even with a good gasket. Reusing a permanently compressed gasket is problematic because the gasket has already been deformed and won’t seal properly, which is a wear/damage issue rather than installing a new damaged component.