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plaining 426 head - clearances
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wekracer View Drop Down
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Joined: 13 Oct 2009
Location: Tebbetts, MO
Points: 1590 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wekracer Quote  Post ReplyReply Direct Link To This Post Topic: plaining 426 head - clearances
    Posted: 20 Feb 2012 at 8:39pm
Dad and i are doing an in frame rebuild on our 8050.  the machine shop that we use called and said that the head had 3 thousandths warpage and needed to take 8 thousandths off to make it right.  but their book said that it would be 3-4 thousandths out of speck when they do.  they said they could recess the valves to they wouldn't be a problem but thought they had the specs for a reason. 
 
The allis dealer that we use said they don't worry about it , they plain them 2 and 3 times as long as the valves are recessed.  does anyone know anything that we should be concerned about.  if they plain it and something goes wrong its' on us now. 
 
PS the injector will clear as well.
 
thanks,
 
Derek
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Feb 2012 at 9:51pm
I don't have the recess at hand but can look tomorrow. If they are not recessed enough the valve will hit the piston.  MACK
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wekracer View Drop Down
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Joined: 13 Oct 2009
Location: Tebbetts, MO
Points: 1590 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wekracer Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2012 at 6:39am
Thanks Mack but they said the valves would not be a problem, they would recess them.  just wondering if there is another reason that we're not thinking of.

thanks,
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2012 at 6:52am
If they recess them to the proper depth every thing should be ok.   MACK
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Dave in il View Drop Down
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Joined: 22 Sep 2009
Location: Manville Il
Points: 1748 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave in il Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2012 at 9:13am
So lets see if I understand this. To recess the valves, they grind the seat so the valve sets deeper in the head and then shorten the stem a corresponding amount. So as the valve opens the relationship is same at the valve face to the seat and the head of the valve and the top of the piston? 
AGCO My Allis Gleaner Company
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wekracer View Drop Down
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Joined: 13 Oct 2009
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Points: 1590 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wekracer Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2012 at 3:49pm
That's pretty close Dave, but i don't think they change the valve stems.  just adjust the clearance on the rocker arm.
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2012 at 9:32pm
NO Dave. If the valve moved down .500 then when you recess it .020 deeper, it still moves .500 but it starts out .020 further away from piston.
  By the way these modern Allis Chalmers engines have adjustable rockers so no need to shorten the stem. MACK
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