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Allis Chalmers Discussion Forum

More WD rebuild questions

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TJanak

03-01-2007 18:25:21

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I still would like to get a few more things cleared up. I am using my WD block and plan on using the WD45 crank and pistons. How do I know which pistons to get as I heard 45's had both flat-top and dished? I think I want/need the dished pistons?

Are there different comp. ratio pistons for the 45 and which do I want?

Can I use my same rods? I don't know the wrist pin diam. for the 45 pistons.

4" or 4 1/8" cylinder liners?

Can I use my WD Zenith carb, or do I need the 45 carb?

Thanks for all of the help!

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steve(ill)

03-01-2007 19:46:40

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Re: More WD rebuild questions in reply to TJanak, 03-01-2007 18:25:21

i think the 45 was about 6.5 to 1 compression. the same motor was updated in the D17 then the 175 and each time the compression was raised about a point. think the 175 was about 8.2 - get a few more comments, but you might want to use a D17 or 175 kit in it with the 45 crank.

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Butch(OH)

03-01-2007 18:44:04

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Re: More WD rebuild questions in reply to TJanak, 03-01-2007 18:25:21

I am using my WD block and plan on using the WD45 crank and pistons. How do I know which pistons to get as I heard 45's had both flat-top and dished? I think I want/need the dished pistons?
Are there different comp. ratio pistons for the 45 and which do I want?

ANSWER(s) Same block(basicaly) so you need WD-45 pistons for a WD-45 crank. Just get the pistons for a WD-45 as sold in many places and websites. They will be the correct compression ratio for gasoline. There used to be differant ratios for differant fuels but I bleieve all you can get now is gasoline ratios which will work in a pinch for LP but not for distillate.

Can I use my same rods? I don't know the wrist pin diam. for the 45 pistons.

ANSWER, Rods and pins are the same for both engines.

4" or 4 1/8" cylinder liners?

ANSWER, About all you will find is 4 1/8" nowadays without lots of searching. Just get a WD-45 liner and piston kit and save yourself some gray hairs, searching and mix and matching.

Can I use my WD Zenith carb, or do I need the 45 carb?
ANSWER, The WD-45 carb and air cleaner is differant. The WD stuff should work OK but HP will be a tad less.

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TJanak

03-02-2007 11:57:35

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Re: More WD rebuild questions in reply to Butch(OH), 03-01-2007 18:44:04

Thanks for the help so far!

Does anybody else have experience with using a D17 or 175 kit with the WD45 crank? Is the extra compression worth it, and if so, would there be other things that I would need to change for sure, like the carb?

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Aaron SEIA

03-02-2007 13:18:19

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Re: More WD rebuild questions in reply to TJanak, 03-02-2007 11:57:35

Couple things to think about. The D 17 and 175 cranks are different than the WD 45 crank. Therefore, you will need to swap the rod and main bearings from a 17 or 175 kit for the correct ones. On the YTmag site the 17 and 175 are the same kit, have seen some list the 17 and 45 kits the same. Think a few of the seals are different as well. What is your plan for the tractor? Parade, puller, work, putz around the yard? If you go 17 or 175 you are probably gonna want to go with the WD45 carb and intake. Also gonna want a WD45 head. I built my WD with a 45 kit from AGCO and put the 45 carb and head on it. I run out of traction before I run out of power no matter WHAT I'm doing with it.
Aaron SEIA

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TJanak

03-02-2007 14:49:24

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Re: More WD rebuild questions in reply to Aaron SEIA, 03-02-2007 13:18:19

Well I think I'm going to go 45 all the way with the engine. Will be the simplest and the tractor will be used for work. I do have the 45 head already as this is not the original engine. I'll see how it runs and maybe do the 45 carb later. Now I just need the 45 crank, and not for $400 either.

Thanks for setting me straight!
Travis

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Aaron SEIA

03-03-2007 05:17:34

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Re: More WD rebuild questions in reply to TJanak, 03-02-2007 14:49:24

If you already have the 45 head, you might have a 45 crank in the block. Have you checked it yet? I'm sure you can find a 45 crank for well under $400 if you look around. The carb and intake shouldn't take much money either.
Aaron SEIA

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TJanak

03-03-2007 05:44:58

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Re: More WD rebuild questions in reply to Aaron SEIA, 03-03-2007 05:17:34

Well from what I have found, the late WD's also got the 4" thick head like the 45's. I have two of these heads, one has been fixed, and one has no cracks. I have measured all 4 cranks I have and all have 2" throw. Apparently I got a couple of the late WD engines with the tall heads and 4" stroke.

So that leaves me needing a WD45 crank which I have several leads on right now. And the 45 carb and intake. I have found a used carb easily enough, but I'm not sure on the intake. What does it look like? I have a spare intake with the plastic housing at the top, is that it? I want to keep this tractor looking like a WD on the outside, which just had the metal "mushroom" at the top. Is the 45 intake really that much better flowing?

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Aaron SEIA

03-04-2007 05:13:43

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Re: More WD rebuild questions in reply to TJanak, 03-03-2007 05:44:58

The 45 carb and air cleaner bolt right on. Think the only difference is the carb intake is about 1/4" larger in diameter and thus needs a slightly larger air cleaner. Only a good Allis "correct" policeman would be able to tell.
Aaron SEIA

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TJanak

03-03-2007 05:44:18

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Re: More WD rebuild questions in reply to Aaron SEIA, 03-03-2007 05:17:34

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