What is a head gasket and how much is the replacement cost?
A head gasket plays a crucial role in ensuring that your vehicle runs well, as it provides an airtight seal between the engine and the cylinder head. Do you want to protect your vehicle better and avoid costly repairs down the road? Keep reading to learn more about head gaskets, the signs of a possible malfunction and the cost of replacing them.
What’s a head gasket?
A head gasket (also called a “cylinder head gasket”) is an essential component of your vehicle’s engine. It sits between the engine block and the cylinder head (the upper part of the engine, which covers the cylinders, houses the valves and creates the combustion chamber). Generally made of composite materials reinforced with metal, it provides a perfectly airtight seal between the two components.
Its primary function is simple: to maintain the engine’s internal compression by preventing gasses from escaping, while also isolating the various fluids found in the engine.
Separating fluids and preventing compression loss
By separating the compartments that hold the motor oil and the engine coolant, a head gasket prevents these fluids from mixing and consequently damaging the engine. In other words, it acts as a protective barrier.
The gasket also prevents compression loss, ensuring that all of the power generated by the explosions inside the cylinders ends up propelling the vehicle. As a result, it ensures engine performance and longevity.
How much should you expect to pay to replace a head gasket?
Do you need to replace a gasket? Are you wondering how much it will cost? Several different factors can affect the cost of replacing a blown head gasket. Among other things, these include the brand, the vehicle model, the complexity of the engine and the garage you choose to do the repairs. As a rule, the price will range from $500 to $2,000, although in certain cases (such as luxury cars or complex engines), the replacement cost may be even higher.
The cost of parts
The head gasket, itself, is relatively affordable, with a price tag between $20 and $100. However, you must also consider the specifications of the head gasket mounted on your engine block, including its thickness (which can vary from 0.5 mm to 1 mm) and its diameter (from 73 mm to 87 mm). You can purchase the gasket that’s right for your vehicle from an auto part supplier or you can order one online by entering the information pertaining to your vehicle.
The cost of labor
Including labor, the cost of replacing a head gasket will generally be more than $500, in accordance with the length and the complexity of the work. Installing a head gasket often requires dismantling the whole engine, which can take between 2 and 6 hours.
The rate for labor varies from one garage to another and from one region to another, generally ranging from $50 to $150 per hour. If you need to have other parts replaced or if the situation requires an in-depth inspection, you should expect to pay additional fees.
How to detect a blown head gasket
Engine overheating
A blown head gasket will allow significant amounts of coolant to leak out of the engine and into the combustion chamber. As a result, the engine can quickly overheat.
The symptoms to be on the lookout for include a rapid increase in engine temperature, steam or smoke coming from the engine bay and clearly visible signs of leaking coolant underneath the vehicle.
Coolant in the motor oil
Does your motor oil exhibit a milky or frothy appearance? If so, it may be contaminated with coolant, which is often the result of a blown head gasket. If there’s contamination, you’ll be able to see it on the dipstick or by opening the cap to the oil fill port.
Since the presence of coolant compromises the oil’s ability to provide lubrication, it can eventually lead to severe engine damage.
Loss of engine power
Another consequence of a blown head gasket is poor cylinder compression, allowing the compressed fuel-air mixture to escape. This loss of compression will significantly reduce your engine power.
The most obvious symptoms include less responsive acceleration, substantially reduced general engine performance and difficulty going uphill or maintaining a high speed.
White smoke coming from the exhaust pipe
White exhaust fumes are another sign of a blown head gasket. The smoke is white because engine coolant has penetrated the combustion chamber and is burning along with the fuel. If you notice thick white smoke persistently coming out of your tailpipe, it’s likely that there’s an internal coolant leak. In that case, it’s advisable to have your vehicle inspected by a qualified mechanic.
Preventive measures to prolong the life of your gaskets
To maintain your head gasket or gaskets in good condition, there’s nothing better than being proactive. By taking good care of your vehicle, you’ll optimize the service life of your gaskets and thus avoid costly repairs.
You should also be sure to follow the manufacturer’s recommendations with regard to changing your coolant. As a rule, you should change your coolant every 30,000 to 50,000 kilometers or every two to five years, depending on the model of your vehicle. Fresh, clean fluid will help your vehicle maintain a stable temperature and prevent it from putting excess pressure on the head gasket.
Routine inspections
Besides changing your coolant, it’s also highly recommendable to have periodic mechanical inspections. Don’t hesitate to entrust a professional with inspecting your vehicle on a regular basis. Experts recommend getting a full engine inspection, which includes checking fluid levels, belts and hoses, every 10,000 to 15,000 kilometers.
Compression tests and tests for detecting coolant leaks are among the other effective diagnostic tools for detecting any potential malfunctions before they turn into major problems.
Do you want to know the price of replacing your head gasket?
You can count on Trans-Mico Automotive to satisfy all your auto repair and maintenance needs. Thanks to our certified mechanics, cutting-edge equipment and commitment to excellence, you can rest assured that your vehicle will be in good hands. Make an appointment today and extend the life of your vehicle!
***
Sources:
OTOGO. How to Recognize a Faulty Cylinder Head Gasket?
LINTERNAUTE. Joint de culasse : qu’est-ce que c’est? Quelles sont les pannes? [Head gasket: what is it? What are the malfunctions?]
ORNIKAR. Joint de culasse : comment ça fonctionne ? [Head gasket: how does it work?]