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Spark plug thread size?
Posted: Thu Dec 13, 2007 9:48 pm
by mgbv8
Does anyone know what the thread size / type is for a Spark Plug on a Rover V8??
Ta
Perry
Posted: Thu Dec 13, 2007 9:52 pm
by ian.stewart
Ill measure one up tomorrow, too bloody cold to go wandering up the garage tonight, 9/16UNF rings a bell
Posted: Thu Dec 13, 2007 10:04 pm
by mgbv8
Thanks Ian
BTW
I'll be at the Pod on the 9th March for the WON day out that I have organised.
Posted: Thu Dec 13, 2007 11:12 pm
by katanaman
pretty sure its 14mm x 1.25
Posted: Fri Dec 14, 2007 2:12 am
by stevieturbo
I'll opt for M14x1.5
defo NOT imperial. Virtually all plugs are metric ( ive never seen an imperial one )
Posted: Fri Dec 14, 2007 4:00 pm
by ChrisJC
It is definitely M14 x 1.25, i.e. M14 with a non-standard thread pitch.
Chris.
Posted: Fri Dec 14, 2007 6:22 pm
by stevieturbo
You are correct....its 1.25mm
Posted: Fri Dec 14, 2007 9:28 pm
by mgbv8
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.