Cam follower pitting

[Bob Culver]

The followeres wear much faster or did on the oils of the time than do chilled iron followers of later makes. But do they ever develop pits in normal use? Either been severely fatigue pitted, very rusty or some original defect. The finish appears woefully coarse and far worse than can be obtained with a fine oilstone or carbide paper finish. Fine finish is usually reckoned vital for cams (at least under any phosphate coating.)