Cracked spark plug

Scrubcadet10

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• May 4, 2019 / Cracked spark plug

• #1

Did a tune up on cub today, noticed when I took the plug boot off, the plug had a crack in the porcelain, or whatever it's called. What might cause it?
Poor material? I never go gorilla tightening them, just snug.

 

D

Darryl G

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• May 4, 2019 / Cracked spark plug

• #2

* post deleted*

 

Last edited: May 4, 2019

7394

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• May 4, 2019 / Cracked spark plug

• #3

Ya know not tightening spark plugs to spec, can cause the plugs to keep the heat & not transfer it to the head as fast.

Just sayin...

I don't think it was expansion & contraction. They are made to handle heat cycles.

 

Scrubcadet10

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• May 4, 2019 / Cracked spark plug

• #4

I think the spec is either 18 or 22 ft lbs.

 

7394

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• May 5, 2019 / Cracked spark plug

• #5

If you go to 15 ft lbs that would be safe.. Or wind them all the way in "by hand" then put the ratchet & socket on & give a good snug.