Re: spark plug Stem cracked - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: spark plug Stem cracked
Posted by Tim (more from Tim) on Tue, 27 Jul 2010 07:17:43
In Reply to: Re: spark plug Stem cracked, lms, Tue, 27 Jul 2010 04:40:34
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Thank you for the quick reply. I thought lean conditions etc. would cause ceramic insulator crack/chip at the working end below the threads; i.e. the part of spark plug that is inside the engine block (when installed). The crack lines that I have on that particular spark plug are on the part of the spark plug that is outside the engine block. Not sure what the technical name for that part of the spark plug is; I called it "stem" as it is the part that sticks up outside the engine block, and is normally wrapped around by the DI nipples. What could be causing the cracks there?
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