Removing Seized Spark Plugs - MG-Rover.org Forums

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post #1 of 28 (permalink) Old 03-11-2005, 20:39 Thread Starter
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Removing Seized Spark Plugs

trying to change my spark plugs but one is seized, whats the best way to remove, what can i use to lubricate it ? not wanting to break the spark plug and/or damaging the engine.
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post #2 of 28 (permalink) Old 03-11-2005, 20:51
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how do you know its ceased? you sure its not just tight in the head? or is it turning but really tight?

Squirty a bit of penetrating fluid down there, wait a few hours then use a breaker bar on a proper spark plug socket and it'll come out.
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post #3 of 28 (permalink) Old 03-11-2005, 22:36
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Nice cabby mate same as mine was,best colour IMO hope the plug isnt cross threaded or you might need a helicoil fitted, did you get it done yet?

IVAN
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post #4 of 28 (permalink) Old 03-11-2005, 22:51 Thread Starter
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ive done nothing as yet, will wait till tomorrow morning before i go to work and spray it then, let it soak in during the time im at work then try it later......might sound stupid, whats a breaker bar ?

If all else fails got the RAC coming out on saturday to fit a new alternator might ask if he could try and loosen it.....
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post #5 of 28 (permalink) Old 03-11-2005, 23:24
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Cool

breaker bar = long pole...so you can put more force into the turn
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post #6 of 28 (permalink) Old 05-11-2005, 01:55
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Yikes!!!

Er... might wanna be a bit careful about doing that...

I've had to get a helicoil put into the port of Spark plug No. 1, after someone gorilla'd the previous plug in. When we used a breaker's bar to get the old one out, it came out with half the old thread!!!

Use care, and prepare for a hassle when you have to find a way of re-coiling the thread... Took me >2 months to find someone who'd do it without taking the head off first!!!

The good news is, my baby's back on the road with no ill effects...

C.
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post #7 of 28 (permalink) Old 05-11-2005, 06:59
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Try it with the engine hot.
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post #8 of 28 (permalink) Old 05-11-2005, 07:11
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Try tightening first then undoing,if it moves give it another squirt,retighten then undo and so on till you work it out.If the thread goes you can get a kit to rethread with an insert with head in place.

HD-Tools 10798 813837 sales@hdtools.co.uk If it comes out ok but thread still stiff use a thread chaser to clean it out.Should get from Halfords etc.Put a spot of copper grease on new plugs and use torque wrench to tighten.Good Luck.
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post #9 of 28 (permalink) Old 05-11-2005, 07:35 Thread Starter
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well i used penetrating fluid and its not budging, got he RAC coming out today to fix my Alternator, may ask if he could give it a try.......the saga continues.......
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post #10 of 28 (permalink) Old 05-11-2005, 11:44
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Has it snapped off yet?
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post #11 of 28 (permalink) Old 05-11-2005, 12:44
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Cool

LOL Maj optimistic as ever i see
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post #12 of 28 (permalink) Old 05-11-2005, 12:57 Thread Starter
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RAC guy wouldnt touch it, but said to use WD40 over the next month or soo ever few days and eventually it will loosen off.......
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post #13 of 28 (permalink) Old 05-11-2005, 13:49
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If you do manage to get it out and the thread is a ruined a mechanic I know uses an old spark plug and cuts down the electrode and thread with an hacksaw so looking at it from the end you have two semi circles.

Slowly wind the cut plug in and out of the plug hole a few times and it will often clear the damaged thread enough so no other work is needed , worked ok for me on a Cavalier I bought witha cross threaded plug.
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post #14 of 28 (permalink) Old 05-11-2005, 14:32
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Quote:
Originally Posted by 1955diesel
Try it with the engine hot.
Seconded... recommended....

Apparently ... in a parallel universe MGJohn drives .........A.......

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Arrrrrggghhhhh......... ......
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post #15 of 28 (permalink) Old 05-11-2005, 14:41
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Quote:
Originally Posted by w4yne
If you do manage to get it out and the thread is a ruined a mechanic I know uses an old spark plug and cuts down the electrode and thread with an hacksaw so looking at it from the end you have two semi circles.

Slowly wind the cut plug in and out of the plug hole a few times and it will often clear the damaged thread enough so no other work is needed , worked ok for me on a Cavalier I bought witha cross threaded plug.
Also seconded ...

Done that several times over the years - it works! Most recently on an MG Montego Turbo Cylinder head which had one plug 'seized' in the head. Previous ownership/service had x-threaded that one plug in the alloy head and it was difficult to remove. Using the slotted old plug ploy cleaned up the threads nicely so that a fresh Helicoil insert was not necesssary! See pics - this was a head off the car but working carefully, it's quite feasible to do the job ON THE CAR. Here's the pics attached:

Apparently ... in a parallel universe MGJohn drives .........A.......

B>>M>>W ....

Arrrrrggghhhhh......... ......

Last edited by MGJohn; 10-07-2015 at 21:19.
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post #16 of 28 (permalink) Old 05-11-2005, 15:31
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Try Diesel down the plug hole, and leave overnight. Rather than use a steady build up of force, a sharp tap is usually better, as follows: get a good, tight fitting socket on the plug, having let it soak overnight in diesel. Try to use a fixed (not a ratchet) handle on the socket, and put some force on it in the 'unscrew' direction (i.e. hand force only, to take up any slack). Then hit sharply with a heavey headed hammer (a mallet is ideal), in the unscrew direction. If you are lucky, the 'shock' will be enough to free the plug.

A top tip for anyone replacing plugs, especially into alloy heads, is to use copper based grease sparing on the thred of the plugwhen inserting it - and do not overtighten! They only need 'nipping' up. If at all possible, spark plugs should be fitted as far as possible using fingers (i.e. no tools) to start the engagement of threads. This will prevent cross threading.

If you can't get it out, and there's no misfire, I would leave it be for the time being!
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post #17 of 28 (permalink) Old 05-11-2005, 16:01
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Quote:
Originally Posted by bw10030

If you can't get it out, and there's no misfire, I would leave it be for the time being!
Probably not a bad idea!

Great tip there MGJohn
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post #18 of 28 (permalink) Old 05-11-2005, 16:54
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It will have to come out eventually, then its back to square one again?? and with all the messing about with it as now, whats the ceramic like..
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post #19 of 28 (permalink) Old 05-11-2005, 19:32
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Don't use WD40, use penetrating oil or diesel. If it doesn't want to come out using reasonable force, leave it alone! You will eventually break it if you keep trying and then it may well be head off time!
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post #20 of 28 (permalink) Old 05-11-2005, 19:49
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Quote:
Originally Posted by 1955diesel
Don't use WD40, use penetrating oil or diesel. If it doesn't want to come out using reasonable force, leave it alone! You will eventually break it if you keep trying and then it may well be head off time!

WD40 is penetrating oil, although I agree that plusgas is better.
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