seized plug

Post Mon Jul 28, 2014 9:07 pm

I have one spark plug that is not coming out (M42). What are my options?

Post Mon Jul 28, 2014 9:15 pm

Fill the gap around the plug with WD40 or similar and leave it overnight.

Post Mon Jul 28, 2014 9:20 pm

Run the engine and remove it while its still hot

Post Mon Jul 28, 2014 9:23 pm

Both of the above

Post Mon Jul 28, 2014 10:01 pm

All of the above, and when it moves don't try to wind it straight out in one, or it might bring the threads in the head with it.
One third of a turn out, then one quarter of a turn back in. Repeat many times, keeping a puddle of WD40 around the threads all the time, which will hopefully work its way down the threads. Keep working it back and forth until it moves freely by hand turning the plug spanner body with no bar fitted to it for leverage.

Post Mon Jul 28, 2014 10:04 pm

OK, thanks

Post Mon Jul 28, 2014 10:12 pm

I bet this has a heli coil attached to it when it comes out. Waiting patiently for the pictures