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deanvanommen 
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Joined: 30 Oct 2024
Location: Ozark MO
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 Topic: WC engine Built to WD45
Posted: 30 Oct 2024 at 12:57pm |
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Can a early WC engine be built to a WD-45 by changing crank pistons and rods? I have seen some puller tractors that have used the WD45 crankshaft but was not sure what rods and pistons they used?
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DrAllis
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Posted: 30 Oct 2024 at 1:03pm |
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WD-45 crankshaft (1/2" more stroke) WD-45 pistons (and new sleeves) WD-45 manifold and carburetor will get you WD-45 HP. Cylinder head is a little different (taller) but that isn't a HP issue.
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deanvanommen
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Posted: 30 Oct 2024 at 1:06pm |
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Will I need WD-45 Rods as well?
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SteveM C/IL
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Posted: 30 Oct 2024 at 1:43pm |
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no but i think 45 rods are precision vs shimmed like WD-WC. A little handier
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DrAllis
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Posted: 30 Oct 2024 at 1:57pm |
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Don't think you can stick WD-45 pistons in an old WC/WD sleeve. When the piston hits the old sleeves ring ridge, you'll break the top ring or the piston itself.
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DrAllis
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Posted: 30 Oct 2024 at 3:42pm |
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Also need a WD/WD-45 governor spring to increase engine top speed about 100-RPM's.
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wjohn
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Posted: 30 Oct 2024 at 9:38pm |
How early is the WC engine serial number? I have read that the first couple of years of production had smaller diameter rod journals. I haven't been able to find much documentation about this but I probably just don't have an old enough parts book. I have seen different bearing part numbers.
Were the rods physically different or did they manage to just change bearing insert thicknesses?
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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wjohn
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Posted: 30 Oct 2024 at 10:07pm |
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Aha, I did enough digging and was able to find it in the AGCO parts books. Looks like anything before engine # WC-13665 had the 2" diameter bearings/rods.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Fred in Pa
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Posted: 31 Oct 2024 at 6:36am |
WC block is too narrow for WD 45 crank and rods to clear , even a early WD block is too narrow .
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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DrAllis
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Posted: 31 Oct 2024 at 7:19am |
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I'm afraid I'd have to disagree with that. The latest WD block is actually a little better than a WD-45 block for 5+ inch strokes. My puller WD block had a 5.375" stroke in it without any issues. Never seen a WC block that wouldn't take a 45 crank, unless you are talking about that very early WC engine with the 2 inch rod journals, of which I have never seen one.
Edited by DrAllis - 31 Oct 2024 at 8:03am
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IBWD MIke
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Posted: 31 Oct 2024 at 9:00am |
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Ignorance is bliss apparently. When I rebuilt the engine in the NF 45, didn't have a good 45 block so I used a WD block. Tractor it came out of was around 70xxx serial, I think. Like Doc mentioned, pullers look for WD blocks in a certain serial range.
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Fred in Pa
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Posted: 31 Oct 2024 at 11:20am |
It is what it is , had a Customer bring me a WD engine and a 45 crank , rods and pistons ,was not enough room in that EARLY WD block for crank to turn around with rods on it. He got a later WD block and there was enough room .
Edited by Fred in Pa - 31 Oct 2024 at 11:26am
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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deanvanommen
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Joined: 30 Oct 2024
Location: Ozark MO
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Posted: 31 Oct 2024 at 11:47am |
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Thank You all for the insight and tips. My Engine S/N is W32781K. The tractor belonged to Grandpa and never left the farm, so I know it is original. Has been parked for 39 years, my fault, but I wanted to rebuild and perhaps upgrade the engine. Not sure I could hand crank a WD-45 engine if I built it. It needs an overhaul since the compression is 30-60 at best.
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DrAllis
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Posted: 31 Oct 2024 at 3:52pm |
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Thinking back to the early/mid 1980's, I installed a WD-45 crank in a 1939 or 1940 styled WC. I wasn't too keen on the idea, as it had a long plate affixed to the block on the carburetor side from getting froze up one time and cracking the block. Someone had made a long plate with a gasket and drilled a dozen or more 1/4" holes and threaded the block to accept them. The customer insisted on using that block, so we did. Nothing fancy. M & W pistons and sleeves from a WC/WD combined with the WD-45 crank, we had 220-240 psi cranking compression. Ran good and never had any issue with the patched block.
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Fred in Pa
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Posted: 31 Oct 2024 at 4:58pm |
My customer was told by many it would work ,he came to my shop so I could show him NOT in this block .There is always a first for everything .
Edited by Fred in Pa - 31 Oct 2024 at 4:59pm
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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steve(ill)
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Posted: 31 Oct 2024 at 5:29pm |
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does the "FIT" depend on which connecting rods you use ?
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Like them all, but love the "B"s.
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PaulB
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Posted: 31 Oct 2024 at 6:15pm |
 Fred in Pa wrote:
My customer was told by many it would work ,he came to my shop so I could show him NOT in this block .There is always a first for everything .
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Maybe your customer should have gone to someone that knew how to put in in. I've known of many that have done in. Some were not even professional mechanics.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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jvin248
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Posted: 31 Oct 2024 at 6:34pm |
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Upgrade the manifold, 10+15% boost? It's important and an easy mod. Add that governor spring for a little boost.
Just keep the engine otherwise stock. Do farm work with it regularly.
Interesting mod on a couple of B's and WD for otherwise stuck engines: harbor freight preditor engines. If your engine is stuck.
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SteveM C/IL
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Posted: 31 Oct 2024 at 11:22pm |
steve(ill) wrote:
does the "FIT" depend on which connecting rods you use ? |
I'm going out on a limb here but I think the rods are alike being that the rod isn't the problem. Those early blocks must be narrow. Wonder if they took different pans?
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SteveM C/IL
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Posted: 31 Oct 2024 at 11:25pm |
deanvanommen wrote:
Thank You all for the insight and tips. My Engine S/N is W32781K. The tractor belonged to Grandpa and never left the farm, so I know it is original. Has been parked for 39 years, my fault, but I wanted to rebuild and perhaps upgrade the engine. Not sure I could hand crank a WD-45 engine if I built it. It needs an overhaul since the compression is 30-60 at best.
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Hand cranking a 6.5-1 WD45 compression would be tuff enough let alone some 7.25-1 D17. Unless you're trying to make a puller it would be more reasonable to just rebuild it as stock WC..
Edited by SteveM C/IL - 31 Oct 2024 at 11:28pm
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