What causes a blown head gasket to fail?
What causes a blown head gasket to fail? Why does a head gasket fail? The most common cause of a blown head gasket is engine overheating. When the engine gets too hot, the cylinder head expands (thermal expansion), which can crush the head gasket and cause failure. Once a head gasket has failed it can cause all manner of problems, including: 1 An overheating engine Can a faulty head gasket cause an oil leak? A faulty head gasket can also allow engine oil to leak into the coolant passages in the cylinder head. This often shows up as an oily/milky...