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Onalaska Ben 
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Joined: 15 Oct 2019
Location: Onalaska washin
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 Topic: Wd engine upgrades
Posted: 15 Oct 2019 at 3:16pm |
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Good afternoon all. I'm new to the ac tractors. Got a 51 wd that needs an engine rebuild and wondering what combination of parts would be the best. Not looking for a pulling engine but something I can have fun with and improve the horsepower. I would still like to run pump gas. So far I can't find any ac guys in my area. Any help would be appreciated. Thanks.
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DrAllis
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Joined: 12 Sep 2009
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Posted: 15 Oct 2019 at 3:37pm |
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Many WD's have had changes made to their engines over the last 70 years. Who knows what has already been done to yours?? Won't really know until you carefully tear it apart. Your engine was originally 201 cubic inches ( 4 inch bore x 4 inch stroke) and had compression around 5.5 to 1 (100 psi) if it was a gasoline tractor. The WD-45 replaced the WD and had 1/2" more stroke for 226 cubic inches with 6.5 to 1 (120 psi) compression, a better intake/exhaust manifold, larger carburetor and larger air cleaner for an increase of 10 HP over the 35 HP WD. Checking the serial number behind the carburetor air hose might give you some information.
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Onalaska Ben
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Location: Onalaska washin
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Posted: 15 Oct 2019 at 5:35pm |
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Serial number is wd285114pa. It's already apart is 4" x 4". It dropped the head off a valve so it needs at least a sleeve rod and piston. Otherwise the engine was in great shape. By the looks of the engine I'd say it doesn't have many hours.
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Sugarmaker
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Location: Albion PA
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Posted: 15 Oct 2019 at 6:01pm |
Ben, Welcome! Cheapest way might be to just repair that one cylinder and have the head totally redone. Might be in the under $500 zone. Complete rebuild with WD std components set aside $1500. That's if your doing the work. Double that if a good shop is doing the labor. Justy my guess art the costs. WD45 crank and components, add another $500-600. Regards, |
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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AaronSEIA
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Location: Mt Pleasant, IA
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Posted: 15 Oct 2019 at 7:48pm |
Best cheap power add on option is to find a good WD45 crank and use WD45, D17, or 170/175 pistons. Then you'd want the WD45 air cleaner and carb for proper air flow. AaronSEIA
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WF owner
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Location: Bombay NY
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Posted: 16 Oct 2019 at 2:24am |
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Probably the least expensive power enhancement would be if you can find a set of good used M&W pistons.SP-46 were for the 4" stroke 201 and SP-48 for the 4.5" stroke 226. Both were overbore 4.125" .
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Alex09(WI)
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Posted: 16 Oct 2019 at 8:53am |
To add power without spending a lot of money, ill second Aaron with using a wd45 crankshaft. You could then use the stock 4" bore wd45 (6.6:1), D17 (7.25:1), or 170 (8:1), or 175 (8.25:1) pistons to get anywhere from 45 to 55hp. If you have to get new sleeves also, consider getting the 4 1/8th sleeve piston set with the 7.25:1 comp ratio. Also consider a D17 governor spring instead on the WD one.
KEEP in mind: the pto gears are the weakest link when increasing hp from stock on a wd/wd45, so if you plan on using the tractor for pto work, don't go too "balls to the wall"
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www.awtractor.com
A&W TRACTOR 920-598-1287
KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY
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Alex09(WI)
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Posted: 16 Oct 2019 at 8:55am |
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and WELCOME TO THE FORUM!!!!
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www.awtractor.com
A&W TRACTOR 920-598-1287
KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY
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Onalaska Ben
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Posted: 16 Oct 2019 at 1:14pm |
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If I was to use a farmall h 8.000" rod is there a piston that would have the correct compression height from the later engines that would give me the compression I'm looking for?
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WF owner
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Posted: 16 Oct 2019 at 7:09pm |
 Onalaska Ben wrote:
If I was to use a farmall h 8.000" rod is there a piston that would have the correct compression height from the later engines that would give me the compression I'm looking for? |
Why???
I know one of the premier AC guys that builds engines for tractor pulling, used Farmall H rods, but I believe the major reason is for clearance on engines that the stroke has been increased significantly (over 5" stroke).
I have never heard of the stock AC rods in a 201 or 226 being a weak link. I think you are wasting your money.
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Onalaska Ben
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Posted: 17 Oct 2019 at 11:03am |
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Wasn't worried about strength but was looking for a way to raise compression. I only have 3 good rods at this time so I'll need to get a rod core.
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Stan IL&TN
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Posted: 17 Oct 2019 at 11:30am |
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I would look for a good running WD45. You will save money and time and get an increase in power.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Charlie175
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Posted: 17 Oct 2019 at 12:01pm |
You will need a bigger carb on the WD if you want power. That little stock one will hold you back.
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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exSW
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Posted: 04 Apr 2022 at 6:58pm |
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Instead of starting a new thread I'll piggyback on this one. How can you tell what mods a WD has had without teardown?
I brought one home and it does run well. The previous owner stated that the engine had been into and warmed up( nearly 50 years ago). It still has the WD manifold and zenith carb(that I've rebuilt).
Edited by exSW - 04 Apr 2022 at 6:58pm
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Learning AC...slowly
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DrAllis
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Posted: 04 Apr 2022 at 7:07pm |
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An honest compression test would possibly reveal something. A regular WD engine will only have about 100 psi of compression. A WD45 will have 120 to 125 psi. A "scope" inserterdf thru a spark plug hole will reveal what the piston head looks like...flat top (WD) or smooth bowl (WD45) or heart shaped bowl (M&W overbore).
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exSW
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Posted: 04 Apr 2022 at 7:10pm |
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Delete
Edited by exSW - 04 Apr 2022 at 7:13pm
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Learning AC...slowly
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exSW
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Posted: 04 Apr 2022 at 7:11pm |
exSW wrote:
DrAllis wrote:
An honest compression test would possibly reveal something. A regular WD engine will only have about 100 psi of compression. A WD45 will have 120 to 125 psi. A "scope" inserterdf thru a spark plug hole will reveal what the piston head looks like...flat top (WD) or smooth bowl (WD45) or heart shaped bowl (M&W overbore). |
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Been wanting an excuse to buy a scope.... Plug right into my phone.
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Learning AC...slowly
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WF owner
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Posted: 04 Apr 2022 at 7:12pm |
50 years ago is about the era that a lot of tractors were rebuilt with M&W sleeves and pistons for increased power. M&W pistons had a heart shaped top. One way to tell without a teardown would be with a borescope camera. I have one and i love it!
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HudCo
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Posted: 05 Apr 2022 at 11:25pm |
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what about the taller wd45 head ?
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DrAllis
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Posted: 06 Apr 2022 at 5:42am |
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Late model WD's had the taller head. Improves cooling but no real HP benefit.
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Sugarmaker
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Posted: 06 Apr 2022 at 7:25am |
exsw, Better start a new thread on your work so far on your WD project! We like pictures too! Regards, Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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exSW
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Posted: 18 Apr 2022 at 9:38am |
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Learning AC...slowly
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DrAllis
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Posted: 18 Apr 2022 at 10:12am |
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Looks like WD manifold, carb and air cleaner.
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exSW
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Posted: 18 Apr 2022 at 4:49pm |
DrAllis wrote:
Looks like WD manifold, carb and air cleaner. |
Yep. No confusion here. '52 WD. Runs like a sewing machine. After 25+ years in a shed.
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Learning AC...slowly
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Phil48ACWC
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Posted: 20 Apr 2022 at 5:32am |
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I have a good WD-45 Crank Shaft I'd sell. $300 plus shipping. Shipping will be a killer from Central Vermont.
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