What size spark plug socket for Subaru Forester?
The recommended spark plug socket size for a Subaru Forester is 16mm. This socket size is necessary to properly remove and install the spark plugs on this popular SUV model.
Understanding Spark Plug Sockets
Spark plugs are a critical component of an internal combustion engine, and they require specialized tools to service. Spark plug sockets are designed with a hexagonal opening that fits snugly over the spark plug, allowing mechanics to easily remove and reinstall them. The socket size corresponds to the diameter of the spark plug, which can vary depending on the make and model of the vehicle.
Spark Plug Socket Size for Subaru Forester
The Subaru Forester, a compact SUV known for its reliability and all-wheel-drive capabilities, typically uses 16mm spark plugs. This means that a 16mm spark plug socket is the correct size to service the spark plugs on a Forester.
Using the proper 16mm socket ensures that the spark plugs can be removed and reinstalled without damage to the plug or the engine. Attempting to use the wrong size socket can lead to rounding out the spark plug, making it difficult or impossible to remove, and potentially causing further damage to the engine.
Tips for Changing Spark Plugs on a Subaru Forester
- Always use a 16mm spark plug socket when servicing the spark plugs on a Subaru Forester.
- Ensure the socket is in good condition and fits the spark plugs snugly to avoid rounding out the plugs.
- Follow the manufacturer's recommended torque specifications when reinstalling the spark plugs to ensure a proper seal.
- Regularly inspect and replace the spark plugs according to the Forester's maintenance schedule to maintain optimal engine performance.
By using the correct 16mm spark plug socket, Subaru Forester owners can safely and effectively service their vehicle's spark plugs, helping to ensure the engine runs smoothly and efficiently for years to come.
What size socket do you need to pull out a spark plug?
The most common socket sizes for spark plugs are 5/8 inch (16mm) and 13/16 inch (20mm), but other sizes like 9/16 inch (14mm) and 3/4 inch (18mm) are also used depending on the vehicle. The exact size depends on the make, model, and age of your vehicle. You may need to check your vehicle's manual or measure the spark plug to find the correct size.
Common spark plug socket sizes
- 5/8 inch (16mm): The most common size, used in many modern and small-engine vehicles, as well as motorcycles.
- 13/16 inch (20mm): Often used in older and larger-engine vehicles.
- 9/16 inch (14mm): Frequently found in Ford vehicles, newer European and Asian cars, and some motorcycles.
- 3/4 inch (18mm): Used in some motorcycles, small engines, and older GM vehicles.
- 11/16 inch (18mm): Used in some motorcycles, small engines, and older BMW vehicles.
You can watch this video to learn about different socket sizes and how to use them: 1mDanny Johnson’s GarageYouTube · Aug 3, 2025
Tips for choosing the right socket
- Consult your vehicle's manual: This is the most reliable way to find the correct size.
- Measure the spark plug: You can measure the hexagonal part of the spark plug to find its size.
- Look for a "spark plug socket": These are specifically designed for spark plugs and often have a rubber insert to protect the porcelain insulator and hold the plug in place.
This video demonstrates how to use spark plug sockets: 51sbeachtrollYouTube · Sep 7, 2018
What size socket for spark plugs on 2009 Subaru Forester?
And a wobbly extension you may have to use a shorter extension just depending on the access but I think on the forward. Cylinder you can just sneak. By like that and and stick the ratchet.
What size spark plug socket for 2015 Subaru Forester?
The spark plug socket size for a 2015 Subaru Forester is a 14mm deep socket, ideally one with a magnetic or rubber insert to hold the plug. You will also need a 3/8" drive and may need wobble extensions to access the plugs due to tight clearance.
This video demonstrates how to remove spark plugs from a Subaru Forester: 1m1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Jul 16, 2018
- Socket size: 14mm
- Socket type: Deep, thin-walled socket with a magnetic or rubber insert to hold the spark plug
- Drive: 3/8"
- Extensions: Wobble extensions are recommended due to the tight working space
What size socket is a Subaru spark plug?
The Subaru spark plug socket size is 14mm for most modern vehicles (FA/FB engines, 2011 and later), while older EJ engines typically use a 16mm socket. You will need a thin-walled spark plug socket, and a magnetic or swivel type is highly recommended to make removal easier due to the tight space.
This video demonstrates the tools and techniques used to replace spark plugs on a Subaru, including the use of a 14mm spark plug socket: 53sDaryl TurcottYouTube · Jun 11, 2023
Socket size by engine type
- For most modern Subarus (2011 and newer, FA/FB engines): Use a 14mm socket.
- For older Subarus (pre-2011, EJ engines): Use a 16mm socket.
Other tips
- Thin-walled: A thin-walled socket is often necessary to fit in the tight spaces between the engine and the spark plug well.
- Magnetic or swivel: A socket with a built-in magnet or swivel is highly recommended, as it helps hold the plug and makes it easier to retrieve from the engine bay.
- Drive size: Subaru spark plug sockets are commonly available in 3/8-inch drive.
- Confirm with owner's manual: If possible, always double-check your vehicle's owner's manual for the exact specifications.
