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Old 05-22-2019, 01:34 PM
HottDogg HottDogg is offline
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Spark Plug Thread differences

just wanted to find my spark plug thread on my E92 335i. NewTIS.info had 23Nm for M12x1.25, and 30Nm for M14x1.25. whats the difference between the M12x1.25 vs M14x1.25 and how to tell them apart?
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Old 05-22-2019, 03:30 PM
Underwurlde Underwurlde is offline
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Check realoem.com for your spark plug part number. A quick random check of an E92 suggests 12120037244 which is M12.

M12 refers to the outer thread size (12mm diameter). This is the piece that screws into the engine head. So 23nm is the required torque.

Not to be confused with the size of the tightening nut which, confusingly, requires a size 14 socket.
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Old 05-22-2019, 07:28 PM
HottDogg HottDogg is offline
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awsome thanks! yeah i got the size 14 socket already off FCP Euro. thanks.
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