Different sizes of spark plugs

[JumboBeef]

I had a spark plug removable tool. Had it for years and years. Fitted everything I ever owned.

Lost it somewhere

Anyway, popped into Halfurds to get a new one.....to be faced with 10mm, 12mm, 14mm or 16mm. What, they come in different sizes?

I just want a 'standard' tool. Staff person #1 who I asked was completely clueless. #2 said 'you need a 10mm mate', so that is what I bought.

Guess what: too small.

What is the 'standard' size of tool?

PS: have a 3.9 Ranger Rover, a 4.0 Jeep and a 2.0 Ford.

[Chicane-UK]

Can't help you on the sizing - but I will strongly advise you don't bother with their "cheapest" spark plug removal tool. Basically a metal cylinder with a thin piece of metal drilled through the top as a handle.

I bought one, and tried to undo my first spark plug - and the "handle" bent. Useless.

[Dogwatch]

JumboBeef said:

Anyway, popped into Halfurds to get a new one.....to be faced with 10mm, 12mm, 14mm or 16mm. What, they come in different sizes?

Progress, innit?

[dmitsi]

14 on my NGK's. There is no standard though. 10 seems very small though, maybe for a lawn mower.

[McSam]

It's worth noting that a 10mm spark plug socket is not a 10mm socket, I think it equates to a 15 or so, but I'm not sure exactly. 10mm is quite common these days, but in your engines I would expect 14mm plugs in each, so I'd get that.

Oh, and as has been said, don't bother with the blue T-handle tool thing, if the plugs are even reasonably tight it's a nightmare - get the Professional range sockets in 3/8th drive.