Valve Seat Pilots

[Nick]

How muck clearance should there be between the pilot and the stone holder? I picked a used machine and have been giving it the once over and found the stone holder a little more warn than I think is usable. The pilot is fine but there seems to be about 4-6 tho clearance. I would think it only needs 1-2 tho to work right. Is the bushing in the stone holder replace able?

any thoughts?

Nick

[Dom G]

Nick

I think you'll find that .004-.006 is way too much. The stone holder needs to fit the pilot very snugly. The target finished seat concentricity is usually a maximum runout of .001.

Dom

[head_tech]

[color=#000000]I have had a set of grinding stone and used then for a number of years, used properly they do an excellent job and there is some great advise from those posting before me, one thing to watch though is try and keep the stone clean and free of oils and carbon even off your hands they just don

[larrycavan]

[quote="head_tech"][color=#000000]I have had a set of grinding stone and used then for a number of years, used properly they do an excellent job and there is some great advise from those posting before me, one thing to watch though is try and keep the stone clean and free of oils and carbon even off your hands they just don