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Talk about engine building here. New products, tricky questions or showcase your work - If it's engine building related it's welcome here.
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?
the marks did appear to be there under the carbon prior to wire wheeling.
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.