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gtc gtc is offline
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Join Date: Nov 2006
Location: Seattle, WA
Posts: 7,779
Originally Posted by toddu View Post
What causes pitting on a cam like that?

It's called adhesive wear. Inadequate lubrication allows the cam and follower surfaces to touch and cold weld together. Then bits of metal are pulled off of one surface.
Typical cause is running an oil with inadequate film strength (wrong weight or additive content)
Generally the pieces of metal are so small that you don't need to worry about fragments... they will get caught in your oil filter and on your sump plug magnet.
1984 Carrera Targa
Old 07-22-2016, 11:49 AM
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