What size socket is the oil drain plug on a 7.3 powerstroke?

The oil drain plug on most 1994–2003 Ford 7.3 Power Stroke engines uses a 14mm hex head, which typically requires a 14mm socket (roughly 9/16 inch). If metric tools aren’t available, a 9/16 inch socket is the closest imperial equivalent. Always verify on your specific truck, as variations can occur with aftermarket pans or service kits.

Context and what to expect

The 7.3 Power Stroke is Ford's renowned diesel that powered heavy-duty trucks through the late 1990s and early 2000s. Its oil drain plug sits on the bottom of the oil pan, and while most references align with a standard hex head, variations can occur due to year-to-year revisions or aftermarket components. Confirming the right size before torqueing is essential to avoid damaging the head.

Common socket sizes to try

To help you identify the correct tool quickly, start with the sizes most often used on this engine. This reference reflects standard practice across model years and common service kits.

• 14mm hex head: the standard size for most 7.3L oil drain plugs. Use a 14mm socket (or, if needed, a 9/16 inch socket as an imperial alternative).


• 9/16 inch socket: a close imperial equivalent for many 14mm heads; useful if metric tools aren’t available.


• 13mm or other sizes: rare variations may occur with aftermarket pans or service kits; if 14mm/9/16" don’t fit, consult the service manual for your exact year/model.

Do not force a size that does not seat cleanly, as that can round the head or damage the plug threads.

Year-to-year variations

While 14mm is overwhelmingly common, Ford's 7.3L production included several revisions. Some early builds or replacement oil pans might show a slightly different head size or a proprietary fastener pattern. If you cannot seat a 14mm or 9/16" socket, check the exact service documentation for your year and trim, or contact a dealer for the precise specification.

In practice, many owners find that a standard 14mm socket covers 1994–2003 trucks, with occasional exceptions due to aftermarket parts. Always inspect the head for wear or damage before attempting removal.

How to confirm the size and remove the plug

The following steps help you verify the right tool and perform the drain with minimal risk of damage.

1. Place a drain pan underneath and inspect the plug head for the number of flats and size.


2. Start with a 14mm socket; try to seat it squarely on the head without forcing. If it doesn’t fit, try a 9/16" socket carefully.


3. Be mindful of oil pressure and hot oil: wait for the engine to cool if you’ve just run it, and avoid burning yourself.


4. Loosen, then remove by hand once it’s free; install a new washer (if present) and torque to the factory specification when reinstalling.

This approach helps ensure a safe removal and proper reassembly of the drain assembly.

Tip: A magnetic drain plug helps collect metal shavings and can simplify future maintenance, and it’s widely recommended for the 7.3L diesel.

Summary

The standard answer is that the oil drain plug on most 7.3 Power Stroke engines uses a 14mm hex head, best addressed with a 14mm socket (about 9/16 inch). If your tool set lacks metric sizes, a 9/16 inch socket is usually a close alternative. Verify for your exact year/model if you’re unsure, and follow proper safety and disposal guidelines when changing the oil.

What size is the oil drain plug on a 1995 7.3 Powerstroke?

The drain plug features a robust 24mm hex head and precise, durable threads for stripping resistance for your 1994-2010 Ford 7.3L/6.0L/6.4L Powerstroke truck.

What size wrench is the oil drain plug on a Ford f350?

USES A 17MM WRENCH.

What size is the oil drain plug on a Ford f250?

The F-250 oil drain plug size is M14-1.5 thread with a 16mm or 5/8-inch head for most modern models from around 2011 to the present. Some older models, like a 1997 with a 7.3L diesel, use M14 x 1.25 with a 15mm or 19mm head, so it's essential to confirm your specific vehicle's requirements before purchasing. 
Modern F-250s (approx. 2011+)

• Thread Size: M14-1.5
• Head Size: 16mm or 5/8" 

Older F-250s (e.g., 1997 7.3L diesel)

• Thread Size: M14 x 1.25
• Head Size: 15mm or 19mm 

Important considerations

• Always verify: The thread size can vary by year and engine type. Double-check the specific size for your F-250 before buying a new plug to ensure a proper fit. 
• Consider a replacement: If you're replacing the plug, consider using a high-quality replacement or a drain valve for future oil changes, available at retailers like Amazon. 

What size is the drain plug on a 7.3 diesel?

The 7.3L Powerstroke oil drain plug is typically an M14-1.25 or M14-1.50 thread size, with a 19mm or 17mm head, depending on the year and specific model. It's best to confirm the specific size for your vehicle before purchasing a replacement, as some sources suggest a 15mm head on certain older models. 

• Common Thread Sizes: M14-1.25 and M14-1.50. 
• Common Head Sizes: 19mm and 17mm. 
• Variations: Some 1997 models may use a 15mm head, but M14-1.25 or M14-1.50 are the more common thread sizes. 
• Recommendation: To ensure a correct fit, it is best to check the size of the drain plug currently installed on your vehicle or consult your owner's manual. 
• Replacement Plugs: You can find replacement plugs with either M14-1.25 or M14-1.50 threads, and they are often magnetic.