Removing spark plugs

S

sico24

Member
Hi all

I've had my 1973 V8 for about 18 months so I'd thought I'd change the plugs. I bought a set of NGKs from Wins. First problem- socket set plug socket wouldn't fit so I bought a simple box plug spanner and cut it down and ground it so it fitted.

Next problem- not a single plug will move at all. I don't want to use huge force in case I strip the socket, so any ideas please? I have put WD40 in the sockets but I wouldn't think this would work as if the socket and plug are gas tight, they will be liquid tight? I have made sure the engine is cold so the heads and plugs haven't expanded.

Help would be most appreciated

Thanks

Simon
 
There's no way of knowing if they're going to strip or snap until you actually get enough leverage on to move them, which I doubt you'll be able to do with a box spanner. Quality (think Snap-On) plug sockets are thin wall and will fit, but I've always used cheapies and had them turned down so they fit. It's one of those jobs where you've got to bite the bullet and go for it, and then sort the consequences out afterwards should the need arise.
 
Hello Simon,

Just be aware that the NGK plugs do not work as well when used in the 10.5 : 1 CR engines as the correct Champion plugs do. The former are fine when the compression was lowered to 9.25 : 1, but don't be surprised if you experience running issues.

This was my experience, and I know of others who also found the same to be true.

When you replace the plugs, use a little anti seize on the threads prior to fitting the new ones. This should prevent the current problem that you are experiencing from happening again.

Ron.
 
As above ! Either buy a hugely expensive snap off socket , or get a six sided one turned down to fit . Go for a run and bring the motor up to temp , park it up for a couple of hours and then pull them . Keep everything straight to the plug , and short or no extensions as possible . If it all goes wrong i have the tool ( tapered tap ) and inserts ( not helicoils , inserts ) that you can borrow , so go for it and don't panic :D
 
Hi all

Thanks for the useful feedback. I'll see if I can find a thin walled socket or grind one down slightly.

Failing that, I'll leave it to the MOT in August and get the garage (a classic Rolls Royce specialist run by a friend of a friend) to do it!

Regards

Simon
 
You must log in or register to reply here.
Back
Top