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Allis Chalmers Discussion Forum
:

setting valve clearance allis B

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tooltimejim

12-05-2009 14:35:49




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setting my valves on the B tractor. bring #1 to TDC, and adjust valve 1,3,5,7, and then bring number 4 to TDC, and adjust 2,4,6,and 8. does this sound right?? thanks, Jim




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Dick L

12-07-2009 08:51:03




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 Re: setting valve clearance allis B in reply to tooltimejim, 12-05-2009 14:35:49  
At top dead center on the compressinon stroke of each cylinder both valves can be adjusted on that cylinder. They can be adjusted in the same order as the firing order. If the magneto is on and in time you can adjust at the snap of the magneto to the cylinder that would have spark.



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old

12-05-2009 16:34:24




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 Re: setting valve clearance allis B in reply to tooltimejim, 12-05-2009 14:35:49  
I always do it the easy and so as to NEVER get it wrong. I adjust them by which ever one has a valve open I adjust the other valve that way you are 100% sure that valve is closed. I.E. when the exhaust valve is open on #1 I adjust the intake and when the intake is open I adjust the exhaust doing it that way you are 100% sure to get it right every time



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steve(ill)

12-05-2009 16:07:20




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 Re: setting valve clearance allis B in reply to tooltimejim, 12-05-2009 14:35:49  
no, thats not right. i dont remeber the exact numbers, but you can do it in two shots. Remember when your at TDC on #1, you can adjust 1 and 2 valves (intake and exh for #1 piston). YOu also have #4 piston at the top on exhaust stroke so exhaust just closed and intake is starting to open.... easy way is to do it in 4 steps. #1 piston to top, do those two valves, turn 1/2 revolution and #2 is top, do 3-4 valves, another 1/2 revolution and #4 is at top to do 7 and 8 valves, then last 1/2 revolution you and got #3 at top to do 5 and 6 valves. Cycle repeats every 2 revolutions of the crank. Motor fires as 1-2-4-3..... 1 is the front by radiator.

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Jeff Z.

12-05-2009 20:09:45




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 Re: setting valve clearance allis B in reply to steve(ill), 12-05-2009 16:07:20  
Real Simple Method. Pretty much the way Old does it.
I do one cylinder at a time.

Adjust intake when exhaust starts to open
{Exhaust push rod will not spin}
Adjust exhaust when intake closes.
{Intake push rod will spin}

Do this with a hot engine.



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tooltimejim

12-05-2009 20:40:19




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 Re: setting valve clearance allis B in reply to Jeff Z., 12-05-2009 20:09:45  
Thanks everyone, that helped. I like the idea of adjusting one at a time, like you all say, hard to get it wrong then, thanks Jim



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