Spark plugs seized... HELP!!!!

[matty_3977]

Hey guys I have a little issue,

On the weekend I decided in my infinite wisdom to give the old girl a major service (filters, oil, leads and plugs) considering I own a TB42 efi GQ I obviosly needed to change my spark plugs the only problem was after getting no1. out the other 5 were stuck, not being a small guy I gave them a good old tug and i could only move them about a 16th of a turn if that, even with a liberal spray of WD40.

I ended up not changing any of the them because I figure no point in changing just 1 but I am perplexed as to what to do to get the others out. I'm pretty sure I cracked one of the plugs ceramic outters but after putting the leads on it seems to be running ok.

I spoke to a local mechanic and he reckons they could have been in there for a good long while (like 100,000km) and because they were stuck then they have never been changed hence the major issue now.

So i guess my question is WTF do I do?

[bear3103]

I would keep soaking them with the WD40 and turning them back and forth until they free up. Patience would be they key to success.

[BigRAWesty]

Start looking for a head.
If you have turned em a little its pretty safe to suggest your gunna have issues.
Im thinking snaping them is on the cards.
Grab a few cans of a stuff called freeze and release. Use it, don't hold back. I'd use half a tin each plug.
If you do snap em, then your in a bit of pain..

[threedogs]

If its at all possible to shock them with a large thru tang screwdriver, spray heaps of CrC even if you try to tighten them a tad first then backing them off.
Heaps of spray is the key maybe even put an extension on for more leverage. Go easy though.

[Dales300exc]

Efi manifolds make getting to the plugs a pain in the but. If they are really stuck taking the top half of the manifold off you will get better access but its far from a quick job.

[threedogs]

If your tv goes ape droppings while you idle outside ,chances are its shorting out

[my third 256]

try someone like the thread doctor

[GQ TANK]

Bursons sell a kit for repairing the thread on a spark plug in situ.

It has a tap that will cut a new thread, replacement sleve that you then screw in with locktight.

I used one on a ef falcon plug.

Just hope they have a kit that will suite a Nissan.

the head has orginly been repaired with a helicoil

[threedogs]

I think spark plug thread is 14mm x 1.50. Helicoils have been around for years, easy to use.
don't forget to blow out any small pieces of swarf from combustion chamber, or dip tap in grease

[the ferret]

Try this.... Run motor until it's hot then freeze the plugs, one at a time then back and forth with the socket , lots of CRC.
Cheers, the ferret.