Description

Mitsubishi OEM Thermostat Housing to Head Gasket for Evo 7/8/9 — Part #MD363254

Firstly, Buy Mitsubishi OEM Thermostat Housing Gasket MD363254 for Evo 7/8/9. The Mitsubishi OEM Thermostat Housing to Head Gasket MD363254 is a genuine factory replacement gasket designed to seal the thermostat housing connection on Mitsubishi Lancer Evolution models. This gasket is used with the 4G63 cooling system and is commonly listed for the Evolution 7, Evolution 8, and Evolution 9. Mitsubishi parts references identify MD363254 as a thermostat case gasket, while Evo-specific parts suppliers list it for the CT9A Evo 7/8/9 platform.

A thermostat housing gasket is a small but important component of the engine cooling system. It creates the sealing surface between the thermostat housing and cylinder head, helping prevent coolant from escaping at the joint. When replacing a thermostat, thermostat housing, or related cooling-system components, installing a new gasket is recommended rather than reusing an old, compressed, damaged, or hardened seal.

Mitsubishi OEM Thermostat Housing to Head Gasket MD363254

The MD363254 thermostat housing gasket is manufactured to match the original Mitsubishi thermostat housing sealing interface. Its purpose is to provide a proper seal between the mating surfaces while the engine cooling system operates through repeated temperature changes.

Firstly, using a genuine Mitsubishi OEM gasket provides the correct application-specific design for the intended cooling-system assembly. Secondly, replacing the gasket during thermostat or housing service helps reduce the possibility of coolant leakage from the housing-to-head connection. Thirdly, a new gasket helps restore a reliable factory-style seal when servicing an older 4G63 engine.

This makes MD363254 a useful replacement part for Evo owners performing preventative maintenance, cooling-system repairs, engine restoration, or larger 4G63 maintenance projects.

Evo 7, Evo 8 and Evo 9 Fitment

The MD363254 gasket is listed by Evo-specific suppliers for the Mitsubishi Lancer Evolution VII, VIII, and IX, including the CT9A platform.

Typical applications include:

• Mitsubishi Lancer Evolution VII
• Mitsubishi Lancer Evolution VIII
• Mitsubishi Lancer Evolution IX
• CT9A chassis
• 2.0L 4G63 turbocharged engine
• Thermostat housing and cylinder-head sealing interface

Some Mitsubishi parts catalogs list the gasket more broadly under 2003–2006 Lancer applications, so buyers should always verify the part number against their exact vehicle or VIN when fitment is critical.

Genuine Mitsubishi OEM Replacement

Choosing a genuine Mitsubishi gasket is particularly important when restoring an Evo cooling system to factory specifications. The MD363254 is identified as a Genuine Mitsubishi thermostat case gasket and is sold as a direct replacement component.

The gasket is designed specifically for the thermostat housing sealing area rather than being a universal gasket that requires trimming or modification. This makes it a practical choice when replacing the thermostat housing, servicing the cooling system, or rebuilding components around the 4G63 engine.

A properly sealed thermostat housing helps keep coolant inside the intended passages. This is important because even a small coolant leak can leave residue around the housing, reduce coolant level over time, and create additional maintenance concerns.

Key Features and Benefits

The Mitsubishi OEM Thermostat Housing to Head Gasket MD363254 offers several advantages for Evo maintenance:

• Genuine Mitsubishi OEM replacement part
• Mitsubishi part number MD363254
• Thermostat case/housing gasket
• Designed for the thermostat housing sealing interface
• Commonly listed for Evo 7/8/9
• Suitable for the 4G63 cooling system
• Factory-style fit and sealing design
• Helps prevent coolant leakage at the housing joint
• Ideal for thermostat replacement
• Useful when replacing or servicing the thermostat housing
• Suitable for maintenance, restoration, and engine-building projects
• New gasket recommended when servicing the housing

The gasket is also listed under diagram/part reference 10117 by Evo-specific parts suppliers.

Important Installation Considerations

When installing MD363254, the mating surfaces should be clean and free from old gasket material, coolant residue, corrosion, and contamination. Mitsubishi service documentation for the Evo cooling system emphasizes cleaning the thermostat housing and cylinder-head sealing surfaces before installation.

The gasket should also be installed in the correct orientation and with the appropriate thermostat housing hardware. Do not assume that additional components such as the thermostat, housing, bolts, or coolant seals are included unless specifically stated in the product listing.

For a complete cooling-system service, it may also be appropriate to inspect the thermostat, thermostat housing, housing bolts, water inlet pipe, O-rings, coolant hoses, and other nearby components for wear or deterioration.

Why Replace the Thermostat Housing Gasket?

A thermostat housing gasket is exposed to engine heat, coolant, and repeated expansion and contraction. Over time, an old gasket can become compressed or lose its ability to seal correctly.

Replacing the gasket when the thermostat housing is removed is inexpensive compared with having to disassemble the same area again to correct a coolant leak. For this reason, MD363254 is a useful maintenance item to keep on hand when servicing the Evo 7, Evo 8, or Evo 9 cooling system.

It is especially relevant when installing a new thermostat or replacing a damaged thermostat housing. Using a new gasket helps provide the proper sealing interface between the components.

Buy Mitsubishi OEM MD363254 Online

If you are looking to buy Mitsubishi OEM Thermostat Housing to Head Gasket MD363254 for an Evo 7, Evo 8, or Evo 9, this genuine replacement gasket is a practical choice for maintaining the factory cooling-system configuration.

Whether you are performing routine maintenance, replacing a thermostat, repairing a coolant leak, restoring a CT9A, or rebuilding a 4G63 engine, having the correct thermostat housing gasket is an important part of the installation. Shop online for genuine Mitsubishi Evo parts and related 4G63 cooling-system components at evomotorparts.com.

Frequently Asked Questions

What is Mitsubishi part number MD363254?

MD363254 is a genuine Mitsubishi thermostat housing/case gasket. It seals the thermostat housing connection and is commonly listed for Mitsubishi Lancer Evolution 7, 8, and 9 applications.

Does MD363254 fit Evo 7?

Yes. Evo-specific parts listings identify MD363254 for the Evolution VII, although JDM vehicle fitment should still be verified by VIN or parts catalog when necessary.

Does MD363254 fit Evo 8 and Evo 9?

Yes. MD363254 is commonly listed for the Mitsubishi Lancer Evolution VIII and IX, including CT9A models with the 4G63 engine.

Is MD363254 the thermostat itself?

No. MD363254 is the thermostat housing gasket, not the thermostat. The thermostat is a separate component and should be purchased separately unless specifically included in a complete kit.

Should I replace the gasket when changing the thermostat?

Replacing the gasket is recommended whenever the thermostat housing is removed. A new gasket provides a fresh sealing surface and helps reduce the possibility of coolant leakage after reassembly.

Is the thermostat housing included?

No. This listing is for the MD363254 gasket only. The thermostat housing, thermostat, bolts, and other components are separate unless specifically stated otherwise. For Evo owners maintaining the factory 4G63 cooling system, the Mitsubishi OEM Thermostat Housing to Head Gasket MD363254 provides the correct replacement sealing component for the thermostat housing assembly, and you can shop evomotorparts.com for genuine Mitsubishi Evo parts for your next maintenance, repair, restoration, or engine-building project.

Buy Mitsubishi OEM Thermostat Housing Gasket MD363254 for Evo 7/8/9, Genuine 4G63 thermostat housing gasket for your Mitsubishi Evolution.