Crankshaft scale

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OwdJockey
Posts: 16
Joined: Sun Sep 19, 2010 12:11 pm
Location: Telford, Shropshire

Crankshaft scale

Post by OwdJockey »

Continuing my Silver Century restoration I noticed this scale on one of the crankshaft lobes. I can easily scrape the scale off, but was wondering what causes this?

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