Topic: Rust on cam lobes

[beemerbum]

In tearing down a barnfind motor, I found very slight rust on the cam lobes. The rest of the
 steel parts are rust free. Can I remove the rust on the lobes using fine steel wool? Is the cam still functional?

[flybox1]

I dont know for sure, but isnt there a coating of some sort on the cam to prevent wear?  or is it just on the rocker?
If so, i'd be worried the rust was into/through the layer.  Removing it might create a pitted area increasing wear on the rocker.
Got a picture?

[Old Scrambler]

Mild 'flash' rust on an OEM unit can be removed with a brass brush and some WD-40 or plain oil..............don't be afraid of a mild pit or two.........it will hold oil for better film-protection when in contact with the rockers.  HOWEVER........if the rocker pads are worn they should be replaced.

[Don R]

 I've used fine scotchbrite and WD40 with no problems.

[camelman]

I've found that an oily rag can lift flash rust off a hardened surface like a cam. Those cams have way more surface area than is really needed too, so a minor pit here or there shouldn't be an issue.

[RAFster122s]

How do you measure rockers for wear? Or, is it just a visual inspection?

[PeWe]

Visual inspection.
 I have seem chrome flaking off, usually on the edges. Not good if you can feel marks with your finger/nail. You will see where the rocker arm pads have been in contact with cam. No problem as long you will not feel it.

[calj737]

How do you measure rockers for wear? Or, is it just a visual inspection?

Use micrometers on the peak of the lobe to determine any side-to-side wear across the lobe. You'd be surprised at how "slanted" the lobes can be if worn. I bought a used 650 cam that had over 0.03 of wear and was sold as in "mint" condition. The rocker faces too should be mic'ed.