spark plug air release

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  #1  
Old 12-13-10, 04:14 AM
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spark plug air release

I have a spark plug that is the exact size for an engine but when it goes into the compression cycle air comes out through the plug hole. The plug is in tight. Any ideas?
 
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Old 12-13-10, 05:01 AM
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Possible crack in the head unless the plug is missing its little sealing ring.

You didn't say what this was on and what size engine.
 
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Old 12-13-10, 06:09 AM
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when you say not the right size, do you mean 12mm threads when it should be 14mm ? If so, that would explain it.
 
  #4  
Old 12-18-10, 05:03 PM
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well, it is the spark plug that came with the engine and originally had a super tight fit but after i poured gas down the spark plug hole and got it to ignite it hasn't been fitting tight or something. It does have the ring and it is on a old briggs 15 horse engine from about 1973 but the spark plug looks unrusted so im guessing that it is from 2000 or later.
 
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