Montag

"When" do you think "maybe" he should be taken to a doctor?

andy_intel

5/8 sounds right, while the threaded portion of the spark plug is 14mm. I reckon the metric socket(16mm) will be fine too, albeit not as tight a fit on the spark plug, but at 18ft/lbs you won't be stripping anything.

eSeM

It ain't 5/8 .... it is a metric size.

Edit: My Halfords socket says 'For 10mm'

andy_intel

5/8 and 16mm are virtually identical, something like 2 thousandths of an inch difference between the two, with the 5/8 socket fitting best.

andy_intel

No worries, but you really can use either a metric or imperial socket on the plugs, just make sure you thread the plugs in by hand first before you torque them down with the wrench - so as to avoid cross threading them.

Dembo

I think mine says 10/16mm on it, just to confuse you. Spark plug sockets have their own weird sizing scheme.

martin j

Are the plugs not 10mm thread, but then 16mm across the flats to give the socket size? don't have one handy on the couch to check.

rob2.2

you need a Deep 16mm socket that will fit down the plug whole in the rocker cover, my deep snap on one fits like a glove

Job Done

martin j

You mean 1/2" drive? 1" drive might be a little bigger. Glad you got it sorted and the seems like a good un.