
AUTOMOTIVE ENGINEERING
February 14, 2025 at 08:19 PM
.. 📣What Is A Head Gasket And How Do I Know If It's Blown:
In addition to sealing the combustion portion of the engine to allow oil and coolant to circulate, the head gasket also seals the combustion chamber in the engine. This allows the vehicle to produce enough power to move forward, as well as keep harmful gases from exiting the combustion chamber by directing them through the exhaust system.
The head gasket in modern vehicles is comprised of several layers of steel material entwined with elastomer, making them more durable and longer lasting. Vehicles produced in the past were equipped with gaskets created by graphite or asbestos. In comparison, today’s gaskets are better as they are less prone to leakage and have little to no health risks as opposed to asbestos-produced gaskets.
What Causes a Head Gasket to Blow?
The most common cause of a blown, or damaged, head gasket is often a result of an engine that has gotten too hot. High engine temperatures are usually caused by a lack of coolant within the radiator, usually due to a leak. Some gaskets are likely to weaken sooner than others depending on their material.
Aluminum, for example, expands faster when heated. Metals that have a higher thermal expansion rate are more sensitive to heat. Higher temperatures can cause the object to change shape, producing an unfavorable outcome. Expansion and distortion of the cylinder head as a result of heat weakens its integrity preventing the head gasket from sealing properly.
Blown Head Gasket Symptoms:
1. Overheating – Caused by a lack of or reduced coolant. Also caused by hydrocarbons entering the cooling system.
2. White, Blue, or Grey smoke – Indicates coolant or oil has entered the combustion chamber.
3. Loss of Power – Due to a lack of compression resulting in sputtering, loss of power, and reduced fuel efficiency.
4. Discolored Oil – A chocolate milk-looking oil is indicative of coolant mixing with oil in the engine.
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