Spark Plug Gap Closing
April 7th, 2019, 11:11 PM
#1
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Join Date: Jan 2018
Posts: 41
Spark Plug Gap Closing
Good evening.
Went to check plugs today and a couple things I have questions on. All 8 gaps on the plugs moved closer. I originally gapped them at .040 and I noticed that the gap closed up. What causes this to happen?
Also all plugs are clean except plug no 7. This plug has a soft white covering on tip. What would this be a sign of?
73 olds omega with 350.
Thanks Bill
Went to check plugs today and a couple things I have questions on. All 8 gaps on the plugs moved closer. I originally gapped them at .040 and I noticed that the gap closed up. What causes this to happen?
Also all plugs are clean except plug no 7. This plug has a soft white covering on tip. What would this be a sign of?
73 olds omega with 350.
Thanks Bill
April 8th, 2019, 05:12 AM
#2
Registered User
Join Date: Jan 2010
Location: central Indiana
Posts: 5,244
I would think either the plugs are wrong for the application (tip is too fat into the combustion chamber) or there is a bunch of carbon on the piston. Either may cause contact with the piston and close up the gap. Other than that, I’m out of ideas.
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