Description

Mitsubishi OEM Cylinder Block Plug Washer for Evo X (MF660038)

Firstly, Buy Mitsubishi OEM Cylinder Block Plug Washer Evo X MF660038. The Mitsubishi OEM Cylinder Block Plug Washer for Evo X (MF660038) is a genuine Mitsubishi replacement washer designed for the cylinder block assembly of the Mitsubishi Lancer Evolution X. This small but important sealing component is used with the OEM cylinder block plug and is part of the factory 4B11 engine hardware. If you are rebuilding an Evo X engine, replacing cylinder block plugs, or restoring an engine block to OEM specification, the correct Mitsubishi washer helps complete the assembly properly.

The MF660038 is listed specifically for the Mitsubishi Evolution X 4B11 engine block by STM Tuned, where it is offered alongside the OEM cylinder block plug 1050A900. Mitsubishi parts catalog data also identifies MF660038 as a gasket associated with the engine/transmission case area, making accurate part-number verification important when ordering.

Mitsubishi OEM Cylinder Block Plug Washer – MF660038

Engine rebuilds often focus on major components such as the cylinder block, crankshaft, pistons, bearings, timing components, and gaskets. However, small sealing washers also play an important role in completing the factory engine assembly.

The MF660038 is designed as the OEM sealing component for its specified application. Rather than substituting a generic washer with unknown dimensions or material, using the correct Mitsubishi part number provides a straightforward way to maintain the intended factory configuration.

This is especially useful when assembling a 4B11 engine after machining, inspection, or a complete rebuild. Small original components can easily be misplaced during disassembly, making OEM replacement hardware valuable for restoration and engine-building projects.

Key Features

• Genuine Mitsubishi OEM replacement part
• Mitsubishi part number MF660038
• Cylinder block plug washer/gasket
• Designed for the Mitsubishi Lancer Evolution X 4B11 engine application
• Used with the OEM cylinder block plug
• Suitable for engine rebuilds and cylinder block servicing
• Ideal for OEM restoration and factory-specification builds
• Sold individually
• Direct replacement for the specified Mitsubishi application

STM Tuned lists MF660038 in its Evo X OEM engine block and internal-parts catalog and specifically identifies it as a cylinder block plug washer.

Buy Mitsubishi OEM Cylinder Block Plug Washer Evo X MF660038, the genuine OEM sealing washer for the 4B11 cylinder block plug.

Firstly: Genuine Mitsubishi OEM Quality

The primary advantage of the MF660038 is that it is a genuine Mitsubishi OEM component. For an Evolution X engine rebuild, using the original manufacturer part number makes it easier to maintain consistency with the factory engine assembly.

Small sealing components should not be overlooked when rebuilding an engine. The correct washer is intended for its specified Mitsubishi application and can help ensure that the corresponding plug is assembled using the appropriate factory hardware.

For enthusiasts restoring an Evo X, genuine Mitsubishi hardware is also useful when the goal is to retain an original-style engine rather than replacing factory components with generic alternatives.

Secondly: Correct Cylinder Block Plug Sealing Component

The MF660038 is associated with the Mitsubishi OEM cylinder block plug 1050A900. STM Tuned lists the 1050A900 plug separately and specifically notes that the MF660038 20 mm washer is also available for the application.

This makes the washer an important component to consider when replacing or reinstalling the cylinder block plug. When servicing the engine block, replacing the associated sealing washer can help ensure that the plug assembly is completed with the correct OEM component.

If your existing washer has been reused multiple times, damaged, lost, or is simply missing from an engine rebuild, the MF660038 provides the correct Mitsubishi part-number reference for replacement.

Thirdly: Ideal for Evo X 4B11 Engine Rebuilds

The Mitsubishi Lancer Evolution X uses the turbocharged 4B11 engine, and the cylinder block contains a number of specialized plugs, bushings, pins, oil jets, and other small components.

STM Tuned’s Evo X engine-block catalog groups the MF660038 with other genuine Mitsubishi cylinder-block components, including the 1050A900 cylinder block plug, MD132806 bushing, 1050A004 dowel pin, and MN187231 chain oil jet.

For a complete engine rebuild, having these smaller components available before final assembly can make the process easier and help prevent delays caused by missing factory hardware.

Applications

The MF660038 is listed for the Mitsubishi Lancer Evolution X (CZ4A) and is associated with the 4B11 engine platform. Genuine Mitsubishi parts databases also show the part number across several Mitsubishi applications, so buyers should verify the vehicle VIN and applicable factory parts diagram before ordering.

For an Evo X-specific engine rebuild, MF660038 is listed within the Evolution X OEM cylinder-block parts catalog.

Specifications

Specification	Details
Brand	Mitsubishi OEM
Part Number	MF660038
Component	Cylinder Block Plug Washer / Gasket
Application	Mitsubishi Lancer Evolution X
Chassis	CZ4A
Engine	4B11
Related Plug	1050A900
Type	OEM sealing washer
Quantity	Sold individually

The related OEM cylinder block plug, 1050A900, is listed for the 2008–2015 Evolution X and is sold separately; STM Tuned identifies the MF660038 as the corresponding 20 mm washer available for that plug.

Why Replace the Cylinder Block Plug Washer?

A washer or gasket may be a small component, but it is part of the sealing arrangement around the corresponding plug. During an engine rebuild, reusing old sealing hardware may not be ideal when a correct OEM replacement is available.

Replacing missing or questionable hardware also helps keep the engine assembly organized and consistent with the factory parts specification.

The MF660038 is particularly useful when rebuilding a bare or partially disassembled Evo X 4B11 cylinder block. It can also be purchased alongside the 1050A900 cylinder block plug when both components need to be replaced.

Buy Mitsubishi OEM MF660038 Online

If you are searching for a Mitsubishi OEM Cylinder Block Plug Washer for Evo X, MF660038 is the genuine Mitsubishi part number to reference for this component. It is a practical OEM replacement for Evo X 4B11 engine rebuilding, cylinder block servicing, restoration, and factory-specification projects.

Because Mitsubishi parts can have multiple catalog applications, always confirm the part number against your vehicle identification number or the appropriate factory parts diagram before ordering.

Frequently Asked Questions

What is Mitsubishi part number MF660038?
MF660038 is a genuine Mitsubishi OEM gasket/washer that is specifically listed by STM Tuned as the Cylinder Block Plug Washer for Evo X.

What cylinder block plug does MF660038 work with?
STM Tuned lists MF660038 alongside the 1050A900 Mitsubishi OEM cylinder block plug and identifies the washer as a 20 mm washer for the application.

Does MF660038 fit the Evo X 4B11 engine?
Yes. It is listed within the Evo X 4B11 engine block and internal-parts catalog.

Is MF660038 sold with the cylinder block plug?
No. The washer and 1050A900 cylinder block plug are listed as separate components, so they should be ordered separately when both are required.

Is MF660038 a genuine Mitsubishi part?
Yes. Mitsubishi OEM parts suppliers identify MF660038 as a genuine Mitsubishi component.

Should I verify fitment before ordering?

Yes. Mitsubishi catalogs show MF660038 across multiple Mitsubishi applications, so checking the VIN and factory parts diagram is recommended before purchase.

Shop and order the Mitsubishi OEM Cylinder Block Plug Washer for Evo X (MF660038) from evomotorparts.com for your 4B11 engine rebuild or OEM restoration.

Buy Mitsubishi OEM Cylinder Block Plug Washer Evo X MF660038, the genuine OEM sealing washer for the 4B11 cylinder block plug.