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Spark plug insulator tip broke?

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Old Nov 11, 2011 | 09:04 AM
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Default Spark plug insulator tip broke?
what would cause that to break??? on a boosted car of only 5 psi?
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Old Nov 11, 2011 | 09:29 AM
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Over tightening or a miss-aligned socket pushing against it while tightening. Could be boost related, maybe.
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Old Nov 11, 2011 | 09:54 AM
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im talking in the combustion chamber..the white insulator tip by the electrode
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Old Nov 11, 2011 | 10:05 AM
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A defective Plug. A Very small possibility of something flowing thru the intake system into the cylinder and out the exhaust.....but highly unlikely. Over 40 years and I have never seen a broken tip.
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Old Nov 11, 2011 | 10:11 AM
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i put a new plug in after that and it still didnt fire on that cylinder...took the plug out and held my finger over the hole and it spit oil and gas on my hand
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Old Nov 11, 2011 | 12:44 PM
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Originally Posted by jak2908
im talking in the combustion chamber..the white insulator tip by the electrode
OK, miss-understood where it had broken.

Originally Posted by jak2908
i put a new plug in after that and it still didnt fire on that cylinder...took the plug out and held my finger over the hole and it spit oil and gas on my hand

I'd check compression on that cylinder. Could be that a broken ring-land hit & broke it...or something damage related in the area of the combustion chamber.

Could be leaky valve stem seal, damaged valve, piston, rings...

Sounds like you'll be pulling the head.
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Old Nov 11, 2011 | 01:06 PM
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its just strange because nothing else on the plug is damaged..the ground strap isnt even touched...and where the insulator tip is broke its broke about 3/16" down
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Old Nov 11, 2011 | 04:20 PM
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Had this happened twice to a race motorcycle we had a few years back,dismissed this as a bad plug. Found out it was preignition after it had nawed the front of the piston above the rings on a tear down.
Its possible its happening to you too. Hope this helps.
Good luck...
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Old Nov 11, 2011 | 07:05 PM
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Got a video stick in the cylinder....edge of the piston is chewed up and gone
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Old Nov 12, 2011 | 07:15 AM
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Originally Posted by jak2908
Got a video stick in the cylinder....edge of the piston is chewed up and gone

Sorry, to hear it. Good-luck as you get her fixed.
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