If you own a Subaru, you might have wondered whether it’s worth it to fix the gaskets.
It’s a common question, and this article is here to help. We’re going to look at several factors that can influence your decision.
This includes the age of your Subaru, the type of gasket it uses, and what could happen if the gasket issue isn’t addressed.
By considering these aspects, we aim to provide a clear and comprehensive guide.
Our goal is to help Subaru owners like you make the best possible decisions for your vehicle’s maintenance and longevity.
What Does A Head Gasket Mean?
A head gasket is a crucial component in an internal combustion engine. It is the gasket that sits between the cylinder head and the block. Its primary job is to seal the two mating surfaces of the top and bottom halves of the engine. This means it has to seal oil, coolant, and compression from the cylinders simultaneously.
The head gasket ensures that the pressure generated by the ignition of the fuel vapor of the spark plug remains within the combustion chamber. It also needs to seal the oilways between the cylinder head and block, so that oil can freely circulate around the entire engine. It also needs to do the same with the waterways, so that coolant can also circulate freely around the engine.
But what makes a head gasket different from any other gasket is that it also needs to seal the cylinder to prevent the engine losing compression. Inside an engine, you have a piston going up and down within a cylinder. On top of the cylinder, you have the cylinder head, which allows the fuel/air mixture to enter, and the exhaust gasses to leave via inlet and exhaust valves. Without a good seal between the cylinder head and the cylinder, when the piston rises on the compression stroke some of the air/fuel mixture will be able to escape, resulting in a loss of compression.
In order to form a good seal around the top of the cylinder, the head gasket features steel rings, known as fire rings. These are actually crushed when the cylinder head is tightened onto the engine block to provide a seal capable of dealing with the high temperatures and pressures involved. This is why you must always tighten the head bolts to the required torque settings.
Is It Worth Fixing Subaru Gaskets?
When it comes to deciding whether to address a problematic Subaru head gasket, the choice requires thoughtful consideration of various factors. In this comprehensive guide, we delve into essential considerations that can significantly influence your decision-making process, from routine maintenance practices to evaluating the overall health of your vehicle.
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Regular Maintenance and Its Impact
Maintaining your Subaru with regular oil changes and addressing mechanical issues is crucial. Neglecting these routine tasks may undermine the success of a head gasket repair. For instance, if oil changes have been overlooked, resulting in oil consumption issues, a head gasket repair may not fully resolve the problem. This underscores the critical role of proactive maintenance in ensuring the efficacy of subsequent repairs.
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Assessing the Car’s Pre-Gasket Condition
A pivotal consideration is the state of your vehicle before the head gasket issue arose. If your car exhibited optimal performance and functionality, opting for a repair may be justifiable. Conversely, if the head gasket problem is compounded by pre-existing issues, it raises questions about the overall feasibility of the repair.
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Overheating Complications
Continuing to drive a vehicle experiencing overheating problems can cause irreparable damage to the engine and cooling system. In such cases, opting for a head gasket repair might not be the wisest choice, as the underlying damage from overheating may not be immediately apparent before the repair.
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Addressing Concurrent Issues
Ignoring or delaying repairs for other minor issues can escalate overall repair costs when combined with head gasket repair expenses. Simultaneously addressing these concerns is advisable to prevent an increase in repair costs and ensure the long-term health of your Subaru.
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Comprehensive Engine Assessment
Given that a head gasket replacement involves disassembling the entire engine, it provides an excellent opportunity to inspect and potentially replace other critical engine components. This includes the timing belt, clutch, drive belt, tensioners, and more. While this may result in additional costs, it serves as a proactive measure to safeguard against potential future issues.
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In-Depth Head Gasket Replacement
A standard head gasket replacement not only includes replacing the head gasket itself but also involves the replacement of valve cover gaskets, thermostat, and an oil and filter change. Additionally, components like the cam and crank seal, water pump, exhaust hoses, spark plugs, sensors, and other small parts may require attention. While this may contribute to a higher repair bill, it can prove cost-effective if these components need replacement in the near future.
Deciding If Repairing Your Blown Subaru Head Gasket Is Worth It:
For vehicles with extensive rust and underlying issues, the benefits of a head gasket replacement may be limited. With repair costs potentially reaching $2000 or more, evaluating whether it aligns with the long-term viability of your aging vehicle becomes crucial. Conversely, for a well-maintained car, addressing the head gasket issue is a logical investment in its continued smooth operation.
How Much Does It Cost To Replace Subaru Head Gaskets?
The cost of a Subaru head gasket replacement typically ranges from $1,100 to $1,500. However, addressing underlying problems during the repair process can elevate the total bill to $3,500 to $4,000. While the head gasket itself is relatively inexpensive, the labor-intensive nature of the repair varies for each car, influencing the overall cost.
What are the Causes of the Quick Wear of Subaru Gaskets?
In addition to the inevitable wear and tear associated with regular usage, a myriad of factors can contribute to the accelerated deterioration of gaskets in your Subaru. These common causes encompass a range of issues, including:
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Extreme Operating Temperatures
The original equipment (OE) gasket in Subarus may struggle to withstand extreme operating temperatures, especially when exacerbated by engine overheating. Such conditions have the potential to induce warping, deformation, and cracking, compromising the gasket’s ability to create a secure seal.
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Incorrect Torque Settings
Improperly torqued bolts holding the cylinder head can create gaps that lead to gasket leaks. Over time, these gaps may worsen due to the vibrations initiated by the imperfect seal, further exacerbating the issue.
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Sudden Temperature Fluctuations
Rapid changes in temperature, oscillating between hot and cold, pose a threat to gaskets by causing warping, deformation, or brittleness. These temperature shifts induce localized thermal expansion, subjecting the gasket to tension and compression that render it brittle and susceptible to cracking over time.
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Engine Configuration
The distinctive flat orientation of Subaru’s boxer engine plays a role in the expedited wear of gaskets. When the flat engine is turned off, its oil tends to linger in contact with the head gasket rather than flowing back into the oil pan. This prolonged contact can contribute to the gradual degradation of the OE gasket.
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Electrolysis
Certain Subaru models may experience coolant leaks that trigger electrolysis, transforming the fluid into a corrosive substance. If this corrosive substance reaches the gasket, it has the potential to rapidly degrade the component.
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Pre-Ignition and Detonation
Occurrences of pre-ignition and detonation generate elevated temperatures, subjecting the cylinders to increased pressure. This heightened pressure places stress on various engine components, including the gasket, pistons, and valves. The resulting tension can expedite the wear and tear of the gasket, leading to premature failure.
What are the Symptoms of a Bad Gasket?
The manifestations of a deteriorating gasket in a Subaru can exhibit diverse symptoms depending on the extent and nature of the damage. However, the most prevalent indicators are manifested through the following signs:
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Overheating
A malfunctioning gasket’s inability to create a secure seal may permit the infiltration of dirt or foreign fluids into engine components. The amalgamation of these contaminants with the vehicle’s fluids can result in thick carbon deposits, causing blockages or lubrication issues. This, in turn, contributes to a gradual escalation of temperatures, leading to a recurring overheating cycle.
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Leaks
A conspicuous sign of a compromised gasket is the occurrence of leaks. As the gasket loses its sealing efficacy, fluids such as oil and coolant may start seeping. Observable signs include puddles beneath the vehicle, fluid streaks or residues in specific auto parts, or the emergence of smoke from beneath the hood.
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White Exhaust Smoke
The release of white exhaust smoke is a potential red flag indicating gasket failure. This phenomenon is often attributed to coolant leakage into the combustion chamber, where it combusts alongside the fuel, resulting in the production of white smoke.
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Decreased Fuel Efficiency
A declining gasket can negatively impact fuel efficiency. Fluid leaks or lubrication issues may force the engine to work harder, leading to increased fuel consumption. Additionally, fuel efficiency can be further compromised by coolant contamination in the fuel.
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Rough Idling
A rough idling experience may signal a compromised gasket. This condition is typically induced by fluid leaks or the combustion of coolant, both of which can disrupt the smooth operation of the engine.
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White Milky Substance Under the Oil Cap
The presence of a white, milky substance beneath the car’s oil cap is indicative of gasket failure. This occurs when either coolant or fuel infiltrates the engine oil, resulting in oil contamination. The observed milky substance is a consequence of the ensuing chemical reaction due to the contamination.
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Engine Knocking
Gasket failure may manifest through engine knocking, primarily attributed to fluid leaks or the combustion of coolant. These issues can compromise the engine’s lubrication, resulting in an irregular running pattern.
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Check Engine Light
An illuminated check engine light is a straightforward indication of a compromised gasket. Various sensors within the engine can detect fluid leaks or coolant combustion, prompting the activation of the check engine light.
Also Read: What Causes and Solves Check Engine Light After Oil Change?
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Car Stalls While Driving
If your vehicle stalls during operation, it could be a sign of a failing gasket. Stalling may occur due to leaks or fluid contamination, necessitating prompt professional attention to prevent further engine damage.
Repairing the Gasket in Subaru Vehicles: A Step-by-Step Guide
When faced with a leaking gasket due to damage in your Subaru vehicle, immediate replacement is crucial. While tackling this task in a do-it-yourself (DIY) setting can be labor-intensive, opting for professional assistance from a mechanic is the recommended solution for effective resolution.
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Detachment of Components
Begin the gasket replacement process by detaching the exhaust manifold, intake, and head. This step is essential to gain access to the damaged gasket and facilitate its removal.
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Gentle Gasket Removal
Carefully remove the old gasket by gently prying it off using a flathead screwdriver. Exercise caution to prevent any damage to the surrounding areas during this delicate procedure.
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Surface Cleaning
Prepare the surface area where the new gasket will be installed by thoroughly cleaning it. Utilize a wire brush or a suitable cleaning solution to ensure the removal of any residual debris, facilitating proper adherence of the new gasket.
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Application of Sealant
Apply a thin layer of sealant to the cleaned surface. This step is crucial for securing the new gasket in place and preventing potential leaks. The sealant acts as an additional barrier, enhancing the overall effectiveness of the gasket replacement.
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Precise Gasket Placement
Position the new gasket correctly on the treated surface and gently press it into place. Ensuring precise placement is vital for the gasket’s optimal functionality and longevity.
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Reinstallation of Components
Once the new gasket is securely in place, reattach any parts, bolts, or screws that were removed during the earlier stages of the process. Ensure that these components are tightened according to their specified torque settings to prevent gaps that could lead to leaks or overtightening that may damage the newly installed gasket.
How long will a Subaru last after head gasket replacement?
The lifespan of a Subaru after a head gasket replacement can vary, but typically, the replacement gaskets are expected to last about as long as the original ones. On average, after the Subaru head gaskets are replaced, they should last somewhere between 100,000 miles to 160,000 miles.
However, this can depend on factors such as the specific model of the Subaru, the quality of the replacement gasket, and how well the vehicle is maintained. It’s also important to note that using the proper coolant and additive can help prolong the life of the head gasket.
FAQs – Is It Worth Fixing Subaru Gaskets?
Why do Subaru head gaskets always fail?
Subaru head gaskets are susceptible to failure due to a design flaw and the boxer engine’s configuration. Over time, the gaskets may deteriorate, allowing coolant and oil to mix, leading to potential leaks and overheating. The engine’s flat design contributes to uneven stress distribution, further increasing the likelihood of gasket failure.
Is it worth replacing a gasket?
The decision to replace a Subaru head gasket depends on factors like the vehicle’s overall condition, maintenance history, and the extent of damage. If caught early, repairs can be cost-effective. However, extensive damage may warrant a replacement, and the cost should be weighed against the car’s value.
At what mileage do Subaru head gaskets fail?
Subaru head gaskets commonly fail between 100,000 and 150,000 miles. This mileage range is often associated with the wear and tear that leads to gasket deterioration. Regular maintenance and proactive monitoring can help detect issues early and mitigate potential damage.
How do you prevent a Subaru head gasket from failing?
Preventing Subaru head gasket failure involves regular maintenance, including timely oil changes, monitoring coolant levels, and addressing overheating promptly. Avoiding aggressive driving and ensuring proper torque during assembly can also contribute to gasket longevity. Routine inspections by a qualified mechanic can help detect potential issues early.
Can I drive a Subaru with a leaking head gasket?
Driving a Subaru with a leaking head gasket is not advisable. Continuing to operate the vehicle under such conditions can lead to severe engine damage, including overheating and potential coolant contamination. Immediate attention from a professional mechanic is essential to avoid further complications.
Do you need a new engine if the head gasket is blown?
A blown head gasket doesn’t necessarily require a new engine. However, prompt and comprehensive repairs are crucial. If the damage is extensive and has led to significant engine issues, a replacement may be considered. Seeking professional evaluation is vital to determine the most cost-effective and reliable solution.
What are the first signs of a blown head gasket?
Common signs of a blown head gasket include overheating, coolant and oil mixing, white exhaust smoke, and visible coolant leaks. Reduced engine performance, rough idling, and a milky substance under the oil cap are additional indicators. Early detection and addressing these symptoms promptly can prevent further damage.
Can you still drive with a blown gasket?
Driving with a blown head gasket is strongly discouraged. Continued operation can lead to catastrophic engine failure, risking further damage and costly repairs. Immediate professional attention is necessary to assess the extent of the damage and determine the appropriate course of action.
What is the most unreliable Subaru engine?
The 2.5L Subaru engine, particularly in models like the Outback and Forester, has been associated with head gasket issues, making it one of the more unreliable options. Regular maintenance and proactive monitoring are crucial for mitigating potential problems with this engine.
Which Subaru engines have head gasket problems?
Subaru engines that have historically faced head gasket problems include the EJ25 engine, commonly found in models like the Outback, Legacy, and Impreza. The design of these engines has been linked to head gasket failures, necessitating careful maintenance and monitoring.
Which Subarus have bad head gaskets?
Subaru models equipped with the EJ25 engine, such as the Outback, Legacy, and Impreza, have been known to experience head gasket issues. Regular maintenance and vigilance are essential for owners of these models to detect potential problems early and address them promptly.
Important: Hyundai Excessive Oil Consumption: What Causes This Problem?
Conclusion
It is imperative to refrain from driving or operating your Subaru if a damaged gasket is detected.
Continuing to use the vehicle under such conditions may lead to exacerbated engine issues, heightened fire risks, or even potential accidents.
Consequently, swift replacement of the damaged gasket is strongly advised at the earliest onset of symptoms outlined herein.
Taking immediate action not only preserves the integrity of your vehicle but also ensures the safety of both the driver and passengers.
Prioritizing prompt gasket replacement is a crucial step toward maintaining optimal performance and averting potential hazards.
