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Farrell(Utah) 
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Joined: 11 Sep 2009
Location: Springville, Ut
Points: 555
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 Topic: Strange WD motor
Posted: 16 Dec 2016 at 7:55pm |
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A friend, not the one in the previous post, told me that he had a WD motor that would not run well. Yesterday, we pulled out the pistons and found that they had a casting number that indicated they were truly WD45 pistons. Looking at the crankshaft, it was clearly for a WD. Seems like that tractor would barely run due to low compression. Am I thinking straight? The pistons sure look like the engine ran very few hours.
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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 16 Dec 2016 at 9:21pm |
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As I read here, the main change from the WD to the WD-45 was a crank with a longer stroke with connecting rods and pistons to not run the longer stroke piston into the head. So likely a combination of piston and rod that was effectively shorter than the WD rod and piston. Its known that those WD45 parts will fit a WD block, but to run right will take crankshaft, rods, and pistons all WD45 parts. WD45 piston with WD crankshaft and rod would end up with low compression and poor performance. WD45 piston and rod with WD crankshaft would have lower compression and really bad performance.
You should be able to test the stroke with a ruler easy enough with a half turn of the crank shaft with the head off or measuring from below. I'm not familiar with the engines to be able to say what the distance the top of the piston should be from the top of the block at top dead center. That would be another place to measure with the specifications for both engines in hand.
Might be a place for a turbo charger to raise the combustion pressure.
Gerald J.
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Farrell(Utah)
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Joined: 11 Sep 2009
Location: Springville, Ut
Points: 555
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Posted: 16 Dec 2016 at 10:19pm |
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We know it is a WD crankshaft. Your post sent me to the parts book to see if my memory was accurate about the connecting rods. Sure enough, the connecting rods are the same for a WD45 and WD. Gerald, you are right about the performance being poor according to my friend. He bought the tractor as a non-runner. I expect someone slipped the WD45 pistons in the tractor thinking they would work in a WD and were terribly disappointed by the performance and abandoned the tractor. Thanks.
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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030
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Don(MO)
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Joined: 12 Sep 2009
Location: Bates City MO.
Points: 6862
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Posted: 16 Dec 2016 at 10:31pm |
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Do you know the piston number that's inside the piston?
If it's a number 223506 it's the same piston used in both low octane fuel on WD Tractors with 5.0:1 ratio; and 7.2:1 ratio for L.P.G. (Butane) & Gasoline engines used in the WD45 tractors.
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3 WD45's with power steering,G,D15 fork lift,D19, W-Speed Patrol, "A" Gleaner with a 330 corn head,"66" combine,roto-baler, and lots of Snap Coupler implements to make them work for their keep.
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Farrell(Utah)
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Location: Springville, Ut
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Posted: 17 Dec 2016 at 11:05am |
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The piston casting number is 229717 and the part number is 229718. These are the 7.25:1 compression ratio pistons.
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A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 17 Dec 2016 at 11:17am |
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I read in another WD45/WD post this morning that the WD45 stroke is a half inch longer than the WD stroke. You say the rods are the same, then for the same compression pressure the WD45 piston has to have its top a quarter inch lower with respect to the piston pin and with the WD crankshaft that guarantees a low compression ratio and performance. Needs the right pistons or a WD45 crank. Pistons are probably easier to acquire.
Gerald J.
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Alberta Phil
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Joined: 13 Sep 2009
Location: Alberta, Canada
Points: 3889
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Posted: 17 Dec 2016 at 11:45am |
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Piston # 229717 is a Power Crater piston for a D 17- 7. 25comp. ratio. I have a complete NOS set of those with sleeves, rings etc.
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Don(MO)
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Joined: 12 Sep 2009
Location: Bates City MO.
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Posted: 17 Dec 2016 at 11:48am |
This might help. 
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3 WD45's with power steering,G,D15 fork lift,D19, W-Speed Patrol, "A" Gleaner with a 330 corn head,"66" combine,roto-baler, and lots of Snap Coupler implements to make them work for their keep.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8530
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Posted: 17 Dec 2016 at 12:48pm |
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Slap a 45 crank in it and make it a tractor
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DaveKamp
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 6036
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Posted: 18 Dec 2016 at 10:15pm |
Hee hee... There's a fair chance that someone 'thought' that since the WD-45 had more power than a WD, that by changing to WD-45 pistons, there'd be an increase in power... a case of 'knowing just enough to be dangerous"...  Mount a roots blower on it... give it 8psi of boost, and it'll be just fine.
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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AaronSEIA
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Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2565
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Posted: 19 Dec 2016 at 5:47am |
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Ive got 175 pistons on a 4" crank in my WC. Pretty solid AC mechanic told me when I built it to do it that way. Makes an honest 34 horse on the dyno. Starts on the 2nd or 3rd pull of the crank.
AaronSEIA
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DrAllis
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Joined: 12 Sep 2009
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Posted: 19 Dec 2016 at 8:46am |
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175 pistons are 8.25 to 1 compression ratio........7.25 to 1 are from a D-17 or WD45 LPG.
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Lonn
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Joined: 16 Sep 2009
Location: Назарово,Russia
Points: 29792
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Posted: 19 Dec 2016 at 8:50am |
 AaronSEIA wrote:
Ive got 175 pistons on a 4" crank in my WC. Pretty solid AC mechanic told me when I built it to do it that way. Makes an honest 34 horse on the dyno. Starts on the 2nd or 3rd pull of the crank.
AaronSEIA |
Did the same with my WD and works great. When I was in highschool and knew just enough to be dangerous......lol Dad had me get used WD45 psitons to put in the WD. It ran nice but was a dog. Then came the new 175 pistons.
Edited by Lonn - 19 Dec 2016 at 8:51am
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Allis dave
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Joined: 10 May 2012
Location: Northern IN
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Posted: 19 Dec 2016 at 9:25am |
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A 7.25 D17 piston should be roughly .530 down from the top of the sleeve. That's measuring aftermarket Reliance/Powermax pistons and not Allis originals, but it should be close. The 175 pistons are .230 down.
I think you can still buy WD pistons. I bet you wouldn't have more than $200 in them. If you go that route, make sure to check your bores. They had a standard bore of 4", but all the aftermarket kits now are 4.125" bore
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