Snapped spark plug woes

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J

JumboBeef

New Member
Posts
52
1991 RRC 3.9 V8 auto.

Ok, so a little job yesterday in the sunshine has turned into nightmare.

I changed the plugs (I fitted the last set, always careful not to over tighten). 7 were a breeze, 1 snapped (the forward most one on the nearside if it makes any difference).

The centre of the plug has come out, leaving the thread. Today, full of hope and positive thinking I borrowed a set of easy-outs but I still cannot shift it.

Any ideas please:(

Anyone near Fife?

Thanks.
 
Can you safely add some heat? it may mean removing the injectors/carbs. Failing that I'd be just as stumped as you are. I'd guess the head will need to come off.
 
Drill out the core of the spark plug thread bit with progressively larger left hand drill bits. When you're done use a bit of small diameter hose taped to a vacuum cleaner to suck out swarf.
 
can you tap in (using a hammer) a piece of square abr that you have tapered at one end, this will bite and allow you to remove using a wrench or socket?
 
I wouldn't, that is a fun way to punch the plug into the cylinder and strip the threads.
 
wammers...

great tool this worth a try.

for interest, what make of plug?

if you try this please do not have your head over the new plug when running....

I have had one blow out on me.....

helicoil maybe the final answer...
 
Depending on how bad it is it may be a head off job - if it is take the opportunity to check cam, followers etc. But if the remains of the plug is just the lower threaded portion I once had a bit of an issue on a Cortina. Had to take the head off, went and saw a mate of mine and his Dad who was a rather good engineer said "no problem" passed a hacksaw blade through the middle of what was left of the plug and gently sawed through the casing then undid it with his fingers. There was a very slight cut in the thread but it didn't affect the plug seat so all was well. HTH.
 
classic kev said:
Depending on how bad it is it may be a head off job - if it is take the opportunity to check cam, followers etc. But if the remains of the plug is just the lower threaded portion I once had a bit of an issue on a Cortina. Had to take the head off, went and saw a mate of mine and his Dad who was a rather good engineer said "no problem" passed a hacksaw blade through the middle of what was left of the plug and gently sawed through the casing then undid it with his fingers. There was a very slight cut in the thread but it didn't affect the plug seat so all was well. HTH.
Click to expand...

Yep done that as well, junior hacksaw blade with a little masking tape wrapped round one end for an handle.
 
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