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BMW M52 engine build/ valves

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Hi everyone,

i have a question. I’m rebuilding to a fairly standard spec a BMW M52B28. The engine has done a few miles and is very dirty inside! I am slowly getting there with the cleaning though. Now, my question is:

I have just started cleaning all the valves and hard carbon build up on the exhaust valves with a bench wire wheel. After I cleaned off the carbon on some of the valves I noticed some black staining on the valves, my worry is that this is plating that has started to come off, is this a thing?

Photo attached.

the marks did appear to be there under the carbon prior to wire wheeling.

thanks

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Not hear of valves being plated. Maybe nitrided, an anti friction coating on the stem or a hardened tip.

Give them a polish.

Thanks for that,

have given them a good polish up now with scotchbrite and the marks are starting to fade. Must have been severely burnt on carbon I guess.

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