19-12-2020, 08:46 PM
(15-12-2020, 07:37 PM)Dave Wortley Wrote: Blimey, it's all spend, spend on A7s these days! Mine have been " cut" with a piece of emery paper glued to the underside of my "penny on stick" valves ( 30mm valves with 30 degree seats altered on my Myford 7 lathe but used to be by holding a file on the valve seat zone). Stick valve/ emery disc in guide, attach rubber sucker mounted in electric drill and give it a wizz. Finish off with valve grinding paste and check the sealing with pencil marks on block valve seat. Anyone gringing yet?
I had a single valve seat which was corroded and I thought the time had come for investment in a Neway cutter and pilot. Having discussed things with a very experienced colleague I followed DW's emery paper stuck to valve routine. Result!
It is amazing how quickly and easily (and cheaply) a decent surface is achieved.