Spark plug thread size?

mgbv8 · Post by **mgbv8** » Thu Dec 13, 2007 9:48 pm

Does anyone know what the thread size / type is for a Spark Plug on a Rover V8??
Ta
Perry

ian.stewart · Post by **ian.stewart** » Thu Dec 13, 2007 9:52 pm

Ill measure one up tomorrow, too bloody cold to go wandering up the garage tonight, 9/16UNF rings a bell

mgbv8 · Post by **mgbv8** » Thu Dec 13, 2007 10:04 pm

Thanks Ian

BTW
I'll be at the Pod on the 9th March for the WON day out that I have organised.

Post by **katanaman** » Thu Dec 13, 2007 11:12 pm

pretty sure its 14mm x 1.25

stevieturbo · Post by **stevieturbo** » Fri Dec 14, 2007 2:12 am

I'll opt for M14x1.5

defo NOT imperial. Virtually all plugs are metric ( ive never seen an imperial one )

ChrisJC · Post by **ChrisJC** » Fri Dec 14, 2007 4:00 pm

It is definitely M14 x 1.25, i.e. M14 with a non-standard thread pitch.

Chris.

stevieturbo · Post by **stevieturbo** » Fri Dec 14, 2007 6:22 pm

You are correct....its 1.25mm

mgbv8 · Post by **mgbv8** » Fri Dec 14, 2007 9:28 pm

What a numpty I am. Of course it 14 x 1.25...
It was only a few months back that I bought the half nuts to fit some spark plugs into a bit of pipe.
I found the reciept in the car.
Thanks lads. I managed to buy a tap today to clean up a dodgy thread in one of my spare heads.
Must have been some grit in there as I got about 3 turns in and felt it bind up. Took the plug out and there was a grain of sand jammed in which had damaged the thread on the plug. So I want to clear the head thread before I put a new plug in.

If that fails I do have a helicoil plug kit.