They should be oilite bushes I think. When I changed mine that is what Myford sent me as replacements. The originals had holes but they seemed to be drilled by a previous owner.

regards Martin

The original bushes are Oilite, as Martin says, and are not drilled for oil as they are oil soaked and permeable

 However, people being people they often drill holes in them to coincide with the oiler – this results in all the oil running straight out of the oiler and through the bearing instead of soaking gradually through.

They should be smooth inside.

This looks to me as though someone has removed the shaft, which has a burr or other sharp protrusion on it, and these score marks are where they have wiggled it to and fro, no doubt grasped firmly in a Mole wrench.

Phil

Edited By Robbo on 03/03/2014 19:27:38

If it were me, I would replace both bushes – but then I'm a picky old sod. Not done this on a S7, but on the ML7 was a simple job, just needed a drift/mandrel turning to size and they were easily driven out and the new ones in.

The downside of the scored bush is that the bearing surface has been much reduced, so it will wear quicker, may already be a bit oval, bearing (no pun intended) in mind that the shaft is pulled to the lower side by the tension in the drive belts, especially the countershaft to headstock belt. Would probably cause some vibrations if worn.

The upside is that it could be said that the scorings act as an oil reservoir and the hole drilled through keeps them filled up..as long as the oil cup is kept full.

Phil