Which bolts should be replaced when replacing a cylinder head gasket?

Which bolts should be replaced when replacing a cylinder head gasket?

• A. Torque-to-yield
• B. Hex head bolts
• C. Durable bolts
• D. Permanent bolts

Answer: (A)

Torque-to-yield bolts are designed to be stretched to a specific length to achieve the correct clamping force for the cylinder head and gasket. This elongation is permanent, so once the head is removed, reusing these bolts cannot guarantee the same clamp and seal. Replacing them ensures the head is clamped with the correct load, reducing the risk of gasket leakage or head warping. Other terms like hex head, durable, or permanent don’t carry the guaranteed one-time-use requirement, so they don’t provide the same assurance about maintaining proper seal after disassembly. Always follow the manufacturer’s guidance and use new torque-to-yield bolts when replacing a cylinder head gasket.

Torque-to-yield bolts are designed to be stretched to a specific length to achieve the correct clamping force for the cylinder head and gasket. This elongation is permanent, so once the head is removed, reusing these bolts cannot guarantee the same clamp and seal. Replacing them ensures the head is clamped with the correct load, reducing the risk of gasket leakage or head warping. Other terms like hex head, durable, or permanent don’t carry the guaranteed one-time-use requirement, so they don’t provide the same assurance about maintaining proper seal after disassembly. Always follow the manufacturer’s guidance and use new torque-to-yield bolts when replacing a cylinder head gasket.