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DormanPart #: 555-105
Dorman 555-105 Engine Expansion Plug
44 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Mazda and Ford, MPV, 929, Ranger, B2000, B2200, 626, Courier, B1800, and 618
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Overview of Dorman Engine Core Plug 555-105
The Dorman 555-105 engine core plug is designed for reliable sealing in engine blocks of select Ford and Mazda vehicles. Constructed from durable steel, this cup-type expansion plug ensures a secure fit and long-lasting performance in applications such as the Ford Ranger and Mazda MPV.
- Material: Steel for corrosion resistance and durability
- Type: Cup type expansion plug for effective sealing
- Maximum Diameter: 1.792 inches
- Minimum Diameter: 1.945 inches
- Compatible with Ford and Mazda models including 626, 929, B2000, B2200, Courier, MPV, and Ranger
Detailed Product Description
The Dorman 555-105 engine core plug is engineered to fit specific engine blocks requiring a cup-type expansion plug. Made from steel, it offers strength and resistance to engine fluids and heat. The plug’s dimensions, with a maximum diameter of 1.792 inches and a minimum diameter of 1.945 inches, provide a precise fit to prevent leaks and maintain engine integrity. This part is essential for maintaining the proper sealing of coolant passages in engines of Ford and Mazda vehicles such as the B2000 pickup and the Mazda 626 sedan.
Applications and Common Issues Addressed
- Seals core holes in engine blocks to prevent coolant leaks
- Replaces worn or corroded expansion plugs causing engine overheating
- Prevents contamination of engine coolant system
- Helps maintain proper engine pressure and fluid containment
- Restores engine block integrity after core plug failure
Installation Notes and Tips
- Ensure the engine block core hole is clean and free of debris before installation
- Use appropriate tools to press the plug evenly into place without damaging the steel material
- Verify the plug’s diameter matches the engine block specifications for a secure fit
- Inspect surrounding areas for corrosion or damage during replacement
- Consult vehicle service manual for torque and installation procedures specific to Ford Ranger or Mazda MPV engines
Quality Assurance and Warranty
Dorman engine core plugs are manufactured to meet or exceed OEM standards for fit and function. The steel construction provides durability under typical engine operating conditions. While specific warranty details may vary, Dorman parts generally come with a limited warranty covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.
| Brand | Dorman |
|---|---|
| Part Number | 555-105 |
| Describe Type | Cup Type |
| Material | Steel |
| Maximum Diameter | 1.792 |
| Minimum Diameter | 1.945 |
| Package Contents | Expansion Plug |
This part fits 44 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1998 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1997 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1996 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1995 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1995 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1994 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1994 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1993 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1993 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1992 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1992 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1991 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1991 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1990 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1990 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1989 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1989 | Mazda | MPV | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1988 | Mazda | 929 | 3.0L | V6 | N/A | 3 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1984 | Ford | Ranger | 2.2L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1984 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1984 | Mazda | B2200 | 2.2L | L4 | N/A | 4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1983 | Ford | Ranger | 2.2L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1983 | Mazda | 626 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box | ||
| 1983 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1983 | Mazda | B2200 | 2.2L | L4 | N/A | 4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1982 | Ford | Courier | 2.0L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1982 | Mazda | 626 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box | ||
| 1982 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1982 | Mazda | B2200 | 2.2L | L4 | N/A | 4 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1981 | Ford | Courier | 2.0L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1981 | Mazda | 626 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box | ||
| 1981 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1980 | Mazda | 626 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box | ||
| 1980 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1979 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1979 | Mazda | 626 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box | ||
| 1979 | Mazda | B2000 | 2.0L | L4 | N/A | 2 Required; 50 mm; Package Quantity: 10; Dorman - AutoGrade - Boxed; Packaging Type: Box |
| 1978 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1977 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1976 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1975 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1974 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1973 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
| 1972 | Ford | Courier | 1.8L | L4 | N/A | Engine Expansion Plug - 1 required, 50 mm size, pack of 10 in a boxed packaging type. |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
261-184993064950D27Z6026CEPC-268
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.