What size wrench do I need for a spark plug?
The size of the wrench you need to remove a spark plug depends on the specific vehicle and spark plug size, but a common size is a 5/8-inch or 16-millimeter spark plug socket or wrench.
Determining the Correct Spark Plug Wrench Size
Spark plugs come in a variety of sizes, typically ranging from 12 millimeters to 18 millimeters in diameter. The most common sizes are 14 millimeters and 18 millimeters. To determine the correct wrench size for your spark plugs, you'll need to check your vehicle's owner's manual or consult a repair guide for your specific make and model.
- For 12-millimeter spark plugs, you'll need a 12-millimeter spark plug socket or wrench.
- For 14-millimeter spark plugs, you'll need a 14-millimeter spark plug socket or wrench.
- For 18-millimeter spark plugs, you'll need an 18-millimeter spark plug socket or wrench.
- Many mechanics also recommend using a 5/8-inch spark plug socket or wrench, as this size is compatible with a wide range of spark plug diameters.
It's important to use the correct size wrench to avoid damaging the spark plug or the cylinder head. Using the wrong size wrench can strip the spark plug threads or round out the hex head, making it difficult to remove the plug.
Tips for Removing Spark Plugs
In addition to using the right size wrench, there are a few other tips to keep in mind when removing spark plugs:
- Ensure the engine is cool before attempting to remove the spark plugs.
- Apply a small amount of penetrating oil or lubricant to the spark plug threads to help loosen them.
- Use a spark plug socket with a rubber insert to grip the plug securely and prevent damage.
- Carefully remove the spark plug, taking note of its condition and any debris or deposits on the electrode.
- When reinstalling the spark plug, be sure to tighten it to the correct torque specification, which is typically between 10 and 30 foot-pounds of torque.
Following these tips will help ensure you use the right size wrench and safely remove and replace your vehicle's spark plugs.
What can I use instead of a spark plug wrench?
Ratchet wrench
This common tool is available in assorted drive sizes and configurations (short, standard, long-handled and flex-head). For removing spark plugs, a longer-handle, flex-head ratchet is the way to go, but a standard ratchet will also work.
What size wrench for spark plugs?
Most spark plugs require a 5/8" (16mm) size spark plug socket.
What are the two sizes of spark plug sockets?
Spark plug sockets come in two sizes: 5/8 inches and 13/16 inches. Most spark plug sockets have a rubber insert that holds the plug snugly in place. You may also need a universal joint if your spark plugs are difficult to reach.
Can I use a regular socket for spark plugs?
What size socket do I need to change out spark plugs? For the majority of plugs, you need a 5/8” or 16mm socket. Some Fords use 9/16″ plugs, some newer European and Asian vehicles use 14mm plugs, and there are a few applications that use 7/8″, 13/16″, ¾” or 18mm plugs.
What size socket is a small engine spark plug?
The most common spark plug socket sizes are the 5/8 inch and 13/16 inch sockets.
How tight should spark plugs be?
Screw in the plug until it “seats,” that is, it's finger tight. Turn the plug an additional ¼ turn. If you're installing a new plug, screw in the plug until it seats, then turn it an additional 2/3-3/4 turn. This crushes the washer between the plug and the head, forming a tight seal.
What's the standard size for a spark plug?
The most common sizes are 5/8 inches and 13/16 inches. Gap Measurement: The gap between the electrodes of the spark plug is crucial for proper engine performance. This can be measured with a gap gauge.
How to measure spark plug socket size?
Various spark plug brands have their own sizing methods. This table for Japanese NGK spark plugs includes a column for the outside diameter length of the hex screw. Another column lists the spark gap size, be determined by the thickness of the wall of your socket.
What size wrench do I need to remove a spark plug from my lawn mower?
Like so and also this this stuff there's a rubber grommet. In the inside. And the rubber grommet. Goes on goes on your spark plug here that stops you snapping the top of the spa plug.
What tool do I need to remove a spark plug?
Ratchet and Socket Extensions
Regardless of the socket used, you will need a standard ratchet wrench to fully remove the spark plug.
