Mitsubishi Eclipse Engine Valve Cover Gasket Set Guide (1995-2006)
Stop oil leaks and keep your Eclipse engine clean and healthy with the right valve cover gasket set.
- Oil leaking into spark plug wells is a primary symptom that causes engine misfires.
- On V6 models, the rear gasket is much harder to replace than the front, requiring removal of the intake plenum.
- Do not overtighten the valve cover bolts; they can easily crack the cover. Use a low torque setting and a crisscross pattern.
- Use RTV sealant sparingly and only in the corners or on half-moon seals as specified by service procedures.
Is Your Eclipse Leaking Oil? Check the Valve Cover Gasket.
A leaking valve cover gasket is a common issue on 1995-2006 Mitsubishi Eclipses as they age. The constant exposure to engine heat causes the original rubber or cork gaskets to harden and fail. This leads to oil leaks that are not just messy, but can cause bigger problems if ignored. Fortunately, replacing the gasket is a straightforward job for many owners, and quality aftermarket parts are readily available.
Symptoms of a Failing Gasket
- Burning Oil Smell: This is often the first sign, caused by oil dripping onto hot exhaust components.
- Visible Oil Leaks: You may see oil and grime caked around the edges of the valve cover.
- Oil in Spark Plug Wells: If the spark plug tube seals fail, oil will pool around your spark plugs. This can cause the engine to misfire.
- Low Engine Oil: A significant leak will cause your oil level to drop over time, potentially triggering the oil light on your dashboard.
- Rough Running Engine: Oil fouling the spark plugs can lead to poor engine performance and misfire codes (e.g., P0300-P0306).
Choosing the Right Aftermarket Gasket Set
For a part like this, a quality aftermarket gasket is often just as good, if not better, than the OEM part. Many aftermarket brands use modern materials like silicone that can offer a superior seal. The key is proper installation. Here’s a look at some available brands:
- Premium Aftermarket (Fel-Pro, Victor Reinz): Fel-Pro is a leading name in aftermarket gaskets, known for designs that help seal imperfect surfaces. Victor Reinz is an OEM supplier for many manufacturers and is also highly regarded for quality. For most Eclipse owners, these brands offer a great balance of quality and price.
- Standard Aftermarket (Beck Arnley, DNJ, Apex): These brands provide a reliable, budget-friendly alternative. Beck Arnley often sources parts from OEM manufacturers. While less is said specifically about these brands for the Eclipse, they are established aftermarket suppliers.
Generation Differences & Installation Notes
The job varies slightly between the second generation (2G, 1995-1999) and third generation (3G, 2000-2005) Eclipses.
- 2G Eclipse (4G63 Engine): This is generally a more straightforward job. You will need to remove the spark plug cover and wires to access the valve cover bolts. Pay special attention to the half-moon seal at the end of the head 🎬 Watch this step-by-step DIY for 2G Eclipse gasket replacement.; a small amount of RTV sealant is required here.
- 3G Eclipse (4-Cylinder 4G64 & V6 6G72): On the V6 engine, the front valve cover is easy to access, but the rear cover is much more difficult. It requires removing the upper intake plenum 🎬 See how to replace the gaskets on a V6 Eclipse GT., which adds significant time and complexity to the job. If you have a V6, it is highly recommended to replace both front and rear gaskets, spark plugs, and wires at the same time.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $20 - $110 |
| New OEM Gasket Set | $40 - $152 |
| Shop Labor | $76 - $392 |
| Total Professional Replacement | $206 - $651+ |
Frequently Asked Questions
Do I need to use sealant (RTV) on the new gasket?
Only use a small amount of RTV sealant at specific points, such as the corners where the timing cover meets the cylinder head and on the half-moon seals (on 4G63 engines). Do not apply sealant around the entire gasket, as this can cause it to slip out of place and leak.
Is this a good DIY job for a beginner?
For a 4-cylinder Eclipse (both 2G and 3G), this is a great DIY job for a beginner 🎬 Watch: Easy 2000-2005 Eclipse 2.4L gasket and spark plug walkthrough. with basic tools. For the V6 Eclipse, replacing the rear gasket is a more advanced job due to the need to remove the intake plenum and is not recommended for inexperienced mechanics.
What are the torque specs for the valve cover bolts?
The torque spec is very low, typically measured in inch-pounds, not foot-pounds. It's critical not to overtighten the bolts, as this can crack the valve cover or deform the gasket, causing a leak. A common recommendation is to tighten them until they are snug, then give them an additional quarter turn. Always follow a crisscross pattern when tightening.
Are there any recalls for the valve cover gasket on the 1995-2006 Eclipse?
No, there are no recalls or common Technical Service Bulletins (TSBs) issued by Mitsubishi or the NHTSA for valve cover gasket failures on these vehicles. This is considered a standard maintenance and wear-and-tear item.
Helpful Videos
Technical Specifications
OEM Part Numbers: MD338905 MD372906 MD188439 1035B339
Set typically includes the main valve cover gasket and spark plug tube seals. V6 models require two separate sets for front and rear covers. Materials vary from cork to molded rubber and silicone.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mitsubishi Eclipse: