Head Gasket: What It Is and Why It Fails

What Is a Head Gasket?

The head gasket is a crucial component located between the engine’s cylinder head and the engine block. It seals the internal combustion process, preventing coolant and oil from mixing. Due to its role in sealing oil, coolant, and compression simultaneously, it endures significant stress compared to other gaskets in the engine.

What Does a Head Gasket Do?

Your engine consists of two main parts: the cylinder block (which houses the pistons and cylinders) and the cylinder head (which contains the valves, spark plugs, and camshaft(s)). The head gasket sits between these two components, sealing the firing pressure within the cylinders and preventing coolant and oil from leaking into or out of the cylinders. It must withstand the stresses from the expanding, contracting, and rubbing of these surfaces while maintaining a tight seal. Fire rings made of steel within the gasket ensure a secure seal around the top of the cylinder, allowing it to handle the high temperatures and pressures of the engine.

Symptoms of a Blown Head Gasket

• Oil or Coolant Leaks: Leaks around the engine head or block could indicate a failed head gasket.
• Overheating: A blown head gasket can lead to engine overheating. If you notice your engine temperature rising, turn off your vehicle immediately to prevent further damage.
• Water Vapor: If coolant leaks into the engine due to a head gasket failure, you might see white smoke or water vapor coming from the exhaust.
• Milky Oil: Brown or milky oil may signal a blown head gasket. This occurs when coolant contaminates the oil, resulting in a milky appearance on the underside of the oil reservoir cover.
• Bubbling in Radiator: Bubbling in the radiator or coolant reservoir can indicate air in the system, which may be caused by a leaky or damaged head gasket.

Conclusion

Following the manufacturer’s recommended service schedule is the best way to keep your head gasket and other crucial engine components in good condition. At Motor City Auto Service, we have the expertise to replace a blown head gasket correctly, restoring the vital seal between the engine block and cylinder head. Contact us at (586) 755-8945 or schedule an appointment today!