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.

[matty_3977]

Thanks for the advice guys, the crap part about this car is its my daily but im hoping I can find a couple of days to soak it in wd40 and catch the deaded public transport to work, I will let ya know how I go.

[happygu]

Hi Matty,

I used this stuff on my exhaust studs .... worked well ( but cause I used it, I don't know if it would have worked without it ... ha, ha )
39312


Mic

[NP99]

WD40 is pretty average, go up market with anti seize.

[Alitis007]

Fill the spark plug wells with injector cleaner and let it soak overnight that should break down any contaminants.
When do try to loosens them again work the spark plug back and forth undoing it 1/8th of a turn everytime

[bear3103]

Hey Matty just wondering if you've had any success with the spark plugs.

[slamnsam]

this is a common problem i see when people fit plugs to an alloy head just as a word of advice always put copper grease or antiseize on the threads of a sparkplug if you are going into an alloy head