Opinion on valve seat grind for a Regular

Tom Fleming · Sep 11, 2011

Getting read to grind the seats for the regular, and have been debating whether to do a 2 angle grind (45 and 30) or just go with a single 45 degree grind. I already know I will have to recess the seats slightly no matter what I do.

My view is, the low compression and low RPM's dont require the 2 angle grind. Also important to note, I plan on a full rebuild next year on this, so what I am looking to do is just get this old girl running. Money and time are short on this one, so for the time being, I am leaving the old guides in. I have the correct pilots for the worn guides (which appear to only be .003 over spec).

Thoughts, comments, admonishment are all welcome!

ps. thought here is to get her running so I don't have to winch on and off the trailer to get her to winter storage, and then have to do it again in the spring........

Anonymous-0 · Sep 11, 2011

One of the keys is how wide will the seat be. Remember that one of the reasons that the other angles are used is to locate the seat properly on the face of the valve and to have the proper seat width. If it is recessed even slightly then when you do your rebuild, plan on new valve seats being installed so that your valve train geometry and your installed height is correct.

rustyfarmall · Sep 11, 2011

I would do the seats at 45° and the valves at 44°. The tractor will be happy with that combination.

J.J. from Afton · Sep 11, 2011

I just finished grinding new valve seats on my Regular up at the local tech school and they way I did them is I ground the valves at 45 and the seats at 46, but I also had to grind the center of the seats at 61 because of the size of the new seats. so Id recommend doing a combination like this much like Rusty suggested as well, but of course you would not have to do the second grind on the seats since you are planning to replace them in the near future anyways.

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GRAPE-DRANK · Sep 11, 2011

My Super A got a 3-angle valve-job.

rustred · Sep 11, 2011

just like J.S. says, seats have to be positioned in the right spot on valve and there is a spec. for the width also. this is done with the three angles. standard procedure on a valve job. the 1 degree interferance fit is to get a good or quick wear in.or even if you get a spec of carbon stuck in seat it wont stay there. the installed height for example was critical on the old ford engines like the 390's because there was no lifter adjustment. you just tightened the rockers down and that was it.

Nebraska Kirk · Sep 11, 2011

A proper seat grind uses three angles, 60, 45 & 30. The 30 & 60 stones are used to make sure the seat is the correct width and correct location on the valve. If you are just doing a quick and dirty grind so that you can get it running, then I would think a 45 degree seat grind will work for a temporary fix.

Tom Fleming · Sep 11, 2011

Thanks guys, I did just a 2 angle grind on it for now. I had forgotten that I had another stone chuck. So, I gave it a 60 and 45 degree dress up, as the seats were not all the bad. Will get the Prussian Blue out tomorrow and check the seat width when I lap them in.

Thanks for all the feedback and pictures.

rustred · Sep 11, 2011

thats what the interferance angle is for also. dont need to lap valves once their ground. just tap them against the seat and it shows the seat position on the valve face.i used to use a cotter pin of the correct size to check seat width.

Opinion on valve seat grind for a Regular

Tom Fleming

Well-known Member

Anonymous-0

Well-known Member

rustyfarmall

Well-known Member

J.J. from Afton

Member

GRAPE-DRANK

Member

rustred

Well-known Member

Nebraska Kirk

Well-known Member

Tom Fleming

Well-known Member

rustred

Well-known Member

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