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Old 14-07-15, 10:32 AM   #1
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Default 106 1.1 - Blew Spark Plug from engine

Morning All,

A friend of mine has a 1.1 zest that has blew a spark plug clean out of the engine.....

What could have caused this? and how can it be fixed?

Reading bits online, could it be that its overtightened and the ali has weakened or maybe water is the coil pack?

Thanks In Advance
Ross
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Old 14-07-15, 11:44 AM   #2
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sounds like the threads have been stripped due to either being over tightened or cross threaded.

It could even of had wrong plugs in
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Old 14-07-15, 12:45 PM   #3
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Ifffffff the threads are ok... then the plug may of not been tightened when it was last changed and gradually unscrewed it self
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Old 14-07-15, 01:01 PM   #4
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It looks highly likely that thread in the cylinder head has been damaged.All you can do is try a new plug,it will either screw in and torque up,or it wont.
If its stripped have a word with these guys Welcome to the Thread Doctor Website - Mobile Thread Repair, Hampshire, Berkshire, Surrey, UK
or someone similar if your out of their area.
They will fit a helicoil (New thread) into the head and make it as good as new.I`ve just used them today to fix a stripped sump drain plug.
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Old 14-07-15, 07:10 PM   #5
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I've had a look today and the spark plug has disappeared completely.

I can't see any thread down the hole, but I may try torquing a plug and hope for the best.... here's the damage::

https://flic.kr/p/vZSJ1b

https://flic.kr/p/vJ1N6c
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Old 14-07-15, 08:22 PM   #6
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Your not using copper grease on the spark plug threads are you?
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Old 14-07-15, 08:37 PM   #7
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The helicoil thread repair kits are good kits. I've used them - though not for spark plugs. Once fitted it works just like a tapped thread - including being stripped if over tightened as I have also found out.
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