Dorman 555-105 Engine Expansion Plug
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Dorman

Dorman 555-105 Engine Expansion Plug

Brand Dorman 555-105
Describe Type Cup Type
Material Steel
Maximum Diameter 1.792
Minimum Diameter 1.945
Package Contents Expansion Plug
Fits Mazda and Ford · 44 vehicles

OE-style fit. Matches the original part's function for dependable engine sealing.

Steel construction. Built from quality material for reliable performance.

Cup type design. A practical engine expansion plug for core sealing applications.

Cross-references 261-184, 993064950 and D27Z6026C for the same application. See all 4.

$40.60Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Order total $40.60
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Dorman 555-105 Engine Expansion Plug

Dorman 555-105 is a steel engine core plug built to match the fit and function of the original expansion plug on specified vehicles. It is engineered for reliable sealing performance in engine block applications where a cup-type plug is required.

  • Steel construction for engine block sealing applications
  • Cup-type design for OE-style fit and function
  • Direct replacement for specified Mazda, Ford, and Ranger applications
  • Engine core plug for restoring a proper coolant seal
  • Cross-reference part numbers include 261-184 and EPC-268

Detailed Product Overview

This Dorman engine expansion plug is made from steel and measures for the specified 50 mm application. The cup-type profile is used in engine block openings where a secure expansion-style seal is needed to help maintain cooling system integrity. Dorman 555-105 is listed for a wide range of classic Ford and Mazda applications, including Mazda MPV, Mazda 929, Ford Ranger, Mazda B2000, Mazda B2200, Mazda 626, and Ford Courier. If you are sourcing a Dorman 555-105 engine core plug for a Mazda MPV or Ford Ranger repair, this part provides an OE-style replacement solution for the original plug location.

What This Part Helps Address

  • Coolant leakage from a worn or corroded engine core plug
  • Loss of sealing at the engine block freeze plug opening
  • Replacement needs during engine service or rebuild work
  • Corrosion-related failure in older steel plug applications
  • Fitment issues when replacing an original 50 mm cup-type plug

Installation Notes and Tips

Verify the engine block opening size and plug style before installation. Clean the bore thoroughly so the steel plug seats evenly, and inspect the surrounding block surface for corrosion or damage. Confirm vehicle-specific fitment for your year, make, and model before ordering; this part is listed for 1972-1998 applications across Mazda and Ford platforms, including Mazda MPV and Ford Ranger. Use proper installation practices for engine core plugs to help achieve a secure seal.

Quality Assurance

Dorman manufactures this expansion plug to match the original part’s fit and function on specified vehicles. The steel construction and OE-style cup design support dependable service in engine cooling system repairs.

This part fits 44 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1998MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1997MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1996MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1995MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1994MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1993MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1992Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1992MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1991Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1991MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1990Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1990MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1989Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1989MazdaMPV3.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1988Mazda9293.0LV6N/A3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984FordRanger2.2LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1984MazdaB22002.2LL4N/A4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983FordRanger2.2LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983Mazda626——N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1983MazdaB22002.2LL4N/A4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982FordCourier2.0LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1982Mazda626——N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1982MazdaB22002.2LL4N/A4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1981FordCourier2.0LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1981Mazda626——N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1981MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1980Mazda626——N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1980MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1979FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1979Mazda626——N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1979MazdaB20002.0LL4N/A2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box
1978FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1977FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1976FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1975FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1974FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1973FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
1972FordCourier1.8LL4N/AEngine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type.
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
261-184993064950D27Z6026CEPC-268