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Farmall & IHC Tractors Discussion Forum
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Farmall C camshaft reality

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janicholson

01-06-2005 12:36:10




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After assembling a 1948 C block with components from a super C w/3.125 bore, including crank, pistons, cam, gears, oilpump, head, valves, springs, pushrods and not replacing the lifters, the valve operating system is .125" TALL at the rocker tower seats. Or almost 1/4" at the pushrods. Are the cams different, or are the lifters different, or am I missing some other ingredient. There is no difference in the size of pushrods, or valve installed height, or rocker geometry.

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Opa A

01-06-2005 17:22:31




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 Re: Farmall C camshaft reality in reply to janicholson, 01-06-2005 12:36:10  
Is it just the valve springs holding the shaft up through the rocker arms. Looking at my "A" there is no time when all of the cam followers or lifters are on the base circle of the camshaft lobes. These engines have approx 0.232" valve lift with the lash adjusted, witch will hold the towers up about 1/8". Make sure the lash adjusting screws are backed off, place all pistons at mid stroke, and pull the shaft down evenly with the nuts. If you are in doubt as to interference in the valve train, keep checking the valves for free movement by pushing them down with your palm until towers are seated. Then turn the crank easy by hand and adjust cold valve lash. My two cents.

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lee

01-06-2005 18:13:42




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 Re: Farmall C camshaft reality in reply to Opa A, 01-06-2005 17:22:31  
the valve installed height can be an issue if they didn't get it right at the machine shop. too tall or short valve installed height will affect the rocker geometry and valve timing. If the height is correct as you say, then I agree with OPA you just have to nest the towers down as they are held up by some of the valves when you install the rocker shaft assembly.



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lee

01-06-2005 18:22:15




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 Re: Farmall C camshaft reality in reply to lee, 01-06-2005 18:13:42  
one other point, I would have brought the lifters in the proper order along with the cam from the donor tractor engine if they were in good shape. If not in good shape I'd prolly at least have bought new lifters or better a reground cam and new lifters. I don't really like to mix and match cams and lifters.



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Opa A

01-07-2005 10:08:32




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 Re: Farmall C camshaft reality in reply to lee, 01-06-2005 18:22:15  
Agree completely with not mixing camshaft and lifters once they have been run. I've had to do it a few times (bosses orders) on IH V800's and 817's in TD25's. One I know has over 3500 hours since swap and valve lash has changed less than .002" at last check. Have tried it on small block chevy with hydraulic lifters and wiped 3 lobes off the cam in one race, maybe 25 miles. The low valve spring pressure in low speed engines, along with solid lifters needing some lash clearance which lets more oil between cam & lifter while on the base circle, seems quite forgiving.

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lee

01-07-2005 11:12:53




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 Re: Farmall C camshaft reality in reply to Opa A, 01-07-2005 10:08:32  
I never said it could not be done, just that I would not favor it. Your application does have a good chance for survival. Stranger things have happened. Just take look at the "near death experience" of EricB who survived being crushed by his tractor and others who have testified they've been run over as well. If those things can happen, I submit your motor will likely run just fine.



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Nebraska Cowman

01-06-2005 13:22:36




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 Re: Farmall C camshaft reality in reply to janicholson, 01-06-2005 12:36:10  
They both take the same cam, lifters, tappets, and rods, so I would guess you've got the wrong valves in your head.



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j a nicholson

01-07-2005 07:07:10




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 Re: Farmall C camshaft reality in reply to Nebraska Cowman, 01-06-2005 13:22:36  
We used the original valves in the same location in the head as they were when disassembled! (Super c).
We were not agressive on finishing the valves (good margins). My thinking is leading me to wonde about stickiness, or corrosion on the lifter/lifter bore. causing us to believe the lifter is on the cam when it is not. The unit is my student's (independent study) and he assembled the cam into the block W/O my direct observation. he may have not pulled the lifters individually to wire brush the shanks!!

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Opa A

01-07-2005 09:57:13




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 Re: Farmall C camshaft reality in reply to j a nicholson, 01-07-2005 07:07:10  
Since you don't yet have the rocker shaft fastened down it would be very easy to check lifter travel. Crank the engine over by hand and measure pushrod travel with a dial indicator, should be the same as the lobe rise you measured on the camshaft before installing it. If lobe rise is not known, check from lobe to lobe for consistent measurements.



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