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Allis Chalmers Discussion Forum

WD heads

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chuck cambis

02-22-2017 08:35:13

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I thought I had read that all the heads for the WC, WD, WD45, and D17 all used the same head. I had bought a couple of heads now on the shelf and noticed one is 3" tall and the other 4" tall. So how do I tell an early or a performace head and or is there a seperate propane head? Did they all use the same rocker assemblies with different length push rods? I need more plowing power with stock parts. Any help is appreciated! chuck.

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02-23-2017 07:15:25

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
Manifolds and carbs will interchange between the two. A D-19 sized carb requires smaller bolts to attach to the manifold, but it can still be made to fit after reworking the throttle shaft and its arm.

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02-23-2017 05:24:01

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
A WD engine will respond to a larger carb, YES. In fact, I have a carb and manifold for a WD that is a TWO-BARREL carb !! Pretty sure it was an M&W or Heisler product from the 1950's. Must have been before the WD-45? but it was a way to increase HP on a WC or WD without going into the engine. No, it's not for sale.

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chuck cambis

02-23-2017 06:25:11

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 Re: WD heads in reply to DrAllis, 02-23-2017 05:24:01  
Since the size of the carb has come up I realized that I had bought a new manifold (reason now unknown) and checked the flange size and as I recall, all three have the same size. Was the WD45 mount larger? The carb I have was bought off fleabay and not sure it's the right one or even fit. Mount studs at 2.400" and the carb output is 1.187". intake is 1.625" and the hose mount 1.875". All the parts and pieces including tractors are stored 50 miles away. I just happened to have the big carb here, but don't know why!
The WD bought many years ago has only been driven thru a parade a couple of times and then parked and forgotten until now. Both tractors have the water jacket crack behind the carb. WD crack ground out ready for gooey stuff. chuck.

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Aaron SEIA

02-23-2017 03:46:29

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
I'm not sure it's worth putting a too big carb on. Are you sure your WD has a stock 4" crank? Haven't been inside too many, but every one I've been in has had a WD45 crank.


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chuck cambis

02-23-2017 06:40:40

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 Re: WD heads in reply to Aaron SEIA, 02-23-2017 03:46:29  
At this point I have not torn into either motor to know piston size or which crank is in what. I have no money or desire to make either tractor into a puller rather just a good strong PLOWING tractor for fun. I have no idea as to the strength of trans or the rear end. I know the WD has straight cut gears and the WD45 does not, so after this spring the WD will be sold to buy parts for the WD45. I retired March 1 this year and play money getting away fast. Thanks, chuck.

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02-22-2017 14:35:36

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
What I failed to answer, was the LPG cylinder head question. There is no LPG head for an AC engine. Same head gas or LPG. The pistons were changed to raise the compression ratio. If you want bolt-on power, a larger WD-45 carb is the way to go and a WD-45 air cleaner. If you are handy enough, graft a D-19 or A-2/C-2 combine carb on it.

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chuck cambis

02-22-2017 19:47:12

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 Re: WD heads in reply to DrAllis, 02-22-2017 14:35:36  
Thanks, I was really looking for that LPG answer! I bought both of these tractors many years ago and the WD45 had a huge carb bolted to it and I can borrow the air cleaner too! What a huge difference in size. The air tube size is 1.472 WD to 1.875 WD45! not being great at math but thats got to be like 40% larger. Is the stock 201 cu.in. engine going to handle that? Certainly willing to give it try. chuck.

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02-22-2017 12:28:31

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
Put a 45 crank in your wd that will give more plowing power

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chuck cambis

02-22-2017 13:45:12

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 Re: WD heads in reply to nl00sb, 02-22-2017 12:28:31  
Thanks, I know about changing the crank. The WD I am using this spring will be sold this summer. Changing the head is an afternoon job little money. Changing the crank is a whole lot more money and I currently have a WD45 needing a lot of work and won't be ready until next fall. The plowing is for fun, no money involved but my own.....Thanks to you and DrAllis for responding! chuck.

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02-22-2017 10:32:53

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 Re: WD heads in reply to chuck cambis, 02-22-2017 08:35:13  
They are NOT all the same cylinder head. The heads can be interchanged between tractors, but you must use the correct rocker arm assemblies(and head bolts) for the correct head. Tall head uses short rocker arm stands. short head uses taller stands. Later model D-17 head uses longer spark plugs.

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