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Burnt valve cause?

 
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Old 10-21-2019, 05:56 PM
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Burnt valve cause?

I had low compression in cylinder 4 and when I pulled the head off I noticed that one of the exhaust valves had burnt on the edge. Just curious as to what would cause this to happen. I did clean the EGR system and new port plugs about a week or so prior to the valve going bad.Also I noticed some hard scale build up on the valve stems,is that normal?
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Old 10-21-2019, 06:15 PM
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Re: Burnt valve cause?

valves could have been adjusted wrong or never
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Old 10-22-2019, 12:08 AM
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Re: Burnt valve cause?

valves tend to collect some carbon/colour
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