Re: grinding valve seats on a cub?

Posted by jdemaris on December 24, 2003 at 18:18:18 from (209.23.29.154):

In Reply to: grinding valve seats on a cub? posted by shannon on December 24, 2003 at 12:24:14:

Valves come out just by removing the keepers from the side of the engine, no big deal. Seems it would behoove you to regrind the seats wherever you've got the tractor. Seems silly to have to remove the engine and bring it to a machine shop for a simple valve-grinding job. I can usually do a little flat-head 4 cylinder, start to finish, in a few hours. That includes removing the valves, grinding the seats, refacing the valves, do a finish seat narrowing, and then reassemble and adjust.
It's very unlikely that valve-grinding compound is going to do anything for you (i.e. lapping). The valves are so small in that engine, the seats can be cut with a little carbide seat cutter kit that's usually used in small lawn mower engines. It's made and sold by Nu-Way. Seems you ought to be able to find someone with the kit. I have a couple of valve refacing machines in my shop, along with a Sioux valve seat grinding set, and also the little Nu-Way carbide cutter set. With an engine like yours, the little cutters do a real nice job. If you had the valves out, with the seats ready to be cut, it would be a 15 minute job of somebody.
Only caveat is, if any of your seats got severely burnt or rusted beyond repair. Then, I guess you would have to remove the engine, have it cut for new steel seat inserts. That's unlikely, though.

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