Questions You Should Know about How To Grind Valve Seats

These engines aren't Indy cars, there isn,t much that can go wrong if you get a clean shiny ring around the valve and seat.

The angle isn't very important either.

I have engines that run well with valve guides that let the valve slop around a lot and this dosn't seem to keep them from running well either.

Unless you are going to actually use the engine for daily work I wouldn't worry
about any of these things being sloppy.

My experience has been mostly with 1 1/2 hp hopper cooled hit and miss open crank engines but they all seem to be very forgiving.

I also have a John Deere M Tractor that I ground the valves on about 12 years ago and they had been rusted up with water from the exhaust pipe flapper sticking open and rain entering the head.

I got the pistons to move with a sledge hammer and an oak block. I then turned the engine thru with a pri bar and Liquid Wrench.

The head looked awfull and the valve heads had aparently been lapped or were worn to the point that they were worn round on the sholders.

Instead of a 45 degree angle on the sholder they had a 30 to 60 degree curve on the sholder.

I just ground the seat and sholder to where they were both shiny all of the way around a 1/16" or so wide and put the head back on using the original casket and 3 coats of Copper Coat spray gasket sealer.

That tractor ran 100,s of hours untill last year when I shut it down because the bottom end started to sound bad.

I only tell you about the tractor to illistrate how forgiving old Iron is.

More free advise.

Dick

CB,These engines aren't Indy cars, there isn,t much that can go wrong if you get a clean shiny ring around the valve and seat.The angle isn't very important either.I have engines that run well with valve guides that let the valve slop around a lot and this dosn't seem to keep them from running well either.Unless you are going to actually use the engine for daily work I wouldn't worryabout any of these things being sloppy.My experience has been mostly with 1 1/2 hp hopper cooled hit and miss open crank engines but they all seem to be very forgiving.I also have a John Deere M Tractor that I ground the valves on about 12 years ago and they had been rusted up with water from the exhaust pipe flapper sticking open and rain entering the head.I got the pistons to move with a sledge hammer and an oak block. I then turned the engine thru with a pri bar and Liquid Wrench.The head looked awfull and the valve heads had aparently been lapped or were worn to the point that they were worn round on the sholders.Instead of a 45 degree angle on the sholder they had a 30 to 60 degree curve on the sholder.I just ground the seat and sholder to where they were both shiny all of the way around a 1/16" or so wide and put the head back on using the original casket and 3 coats of Copper Coat spray gasket sealer.That tractor ran 100,s of hours untill last year when I shut it down because the bottom end started to sound bad.I only tell you about the tractor to illistrate how forgiving old Iron is.More free advise.Dick

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