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Allis Chalmers Discussion Forum
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c Allis motor overhall

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pullerwanabe

08-03-2007 09:16:59




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I have an old C allis that I would like to pull. I dont want to put alot of mony into it but I would like a little more power. The motor is stuck and it needs overhalled. Someone told me that I could take it up to 149 CID by using a D15 crank and piston/sleve kit. Will this fit in a C motor and how much else needs to be done to get it to fit.




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pullerwanabe

08-04-2007 08:24:03




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 Re: c Allis motor overhall in reply to pullerwanabe, 08-03-2007 09:16:59  
Thanks for the replies. I am not a machinest. The club I recently joined has a 2600 pound class that the Oliver 66s dominate. I would like very much to be able to compete with them. I will probibly go with the 1/16 overbore kit. If my calculations are right, that will take it up to about 130CI. Maybe that and some head work will do the trick.



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LWD

08-04-2007 01:11:25




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 Re: c Allis motor overhall in reply to pullerwanabe, 08-03-2007 09:16:59  
it dont take much to put a `ca` 4 speed in if they let ya. Its not to bad machine work to put in 3.5 D 14 sleves,but it takes custom pistons,all of whitch takes$$$ if your not a machinest its going to cost.



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Dick L

08-03-2007 10:16:13




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 Re: c Allis motor overhall in reply to pullerwanabe, 08-03-2007 09:16:59  
Not wanting to spend a lot of money is key to what you can do. The D 15 crankshaft will not fit your C with out spending a good deal of money. Without spending much more than what most would spend on an overhaul you can get your C to be somewhat stronger. Get the standard over bore sleeve and piston kit. Have .100 to .150 thousands removed from the head with a good valve grind. To get high domed pistons and stroking the crankshaft will start to draw down the pocket book.
I put all the insides from a D-15 in my C and the total was a bit over 3000.00 from start to finish.

If you stay in the 3000 pound class pulling you will not need a lot of extra HP to be up in the top 3 if every thing else is set up well.

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ohio

08-04-2007 10:37:27




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 Re: c Allis motor overhall in reply to Dick L, 08-03-2007 10:16:13  
what has to be done to fit the crank in? are the journals bigger?(i am a machinist, and now i'm curious) does the block just need bored for the oversize sleeves?



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Dick L

08-04-2007 15:24:36




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 Re: c Allis motor overhall in reply to ohio, 08-04-2007 10:37:27  
Yes on both counts. The block was bored and then sealed with an inch of expandable block cement. Where the cement expands the sleeves have to be bored in the block to bring them back out to size. The crank has to be over sized machined to the crankshaft specs of the old crankshaft specs. The crank then can be ground to standard bearings. Before starting both crankshafts needs to be set up on a layout plate and then the machining worked from the bearing centers. You have to change diameters and widths on the mains. The cross drilled oil lines will have to be plugged and welded before you start. They will need to be replugged and rewelded before grinding. I redrilled mine but you can not use the same path as the old holes which the reason will be clear as soon as you machine the mains. While it was at the crankshaft grinder I had him weld and move the stroke to 4 inches for standard bearings. I used the D 15 rods and cam shaft. I sent the cam out for a computer programed power grind. No spray holes in the cam. A bunch of detail stuff to keep track of all the way thru.

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ohio

08-05-2007 09:15:18




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 Re: c Allis motor overhall in reply to Dick L, 08-04-2007 15:24:36  
wow, that's invasive! maybe i'll try to locate a d-15 block!



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