WC engine Built to WD45
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=203902
Printed Date: 22 Nov 2024 at 1:20pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: WC engine Built to WD45
Posted By: deanvanommen
Subject: WC engine Built to WD45
Date Posted: 30 Oct 2024 at 12:57pm
| 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? |
Replies:
Posted By: DrAllis
Date Posted: 30 Oct 2024 at 1:03pm
| 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. |
Posted By: deanvanommen
Date Posted: 30 Oct 2024 at 1:06pm
| Will I need WD-45 Rods as well? |
Posted By: SteveM C/IL
Date Posted: 30 Oct 2024 at 1:43pm
| no but i think 45 rods are precision vs shimmed like WD-WC. A little handier |
Posted By: DrAllis
Date Posted: 30 Oct 2024 at 1:57pm
| 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. |
Posted By: DrAllis
Date Posted: 30 Oct 2024 at 3:42pm
| Also need a WD/WD-45 governor spring to increase engine top speed about 100-RPM's. |
Posted By: wjohn
Date 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? ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: wjohn
Date Posted: 30 Oct 2024 at 10:07pm
|
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. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: Fred in Pa
Date 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 . ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: DrAllis
Date Posted: 31 Oct 2024 at 7:19am
| 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. |
Posted By: IBWD MIke
Date Posted: 31 Oct 2024 at 9:00am
|
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. |
Posted By: Fred in Pa
Date 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 .
------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: deanvanommen
Date Posted: 31 Oct 2024 at 11:47am
|
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. |
Posted By: DrAllis
Date Posted: 31 Oct 2024 at 3:52pm
| 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. |
Posted By: Fred in Pa
Date 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 .
------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: steve(ill)
Date Posted: 31 Oct 2024 at 5:29pm
|
does the "FIT" depend on which connecting rods you use ? ------------- Like them all, but love the "B"s. |
Posted By: PaulB
Date Posted: 31 Oct 2024 at 6:15pm
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. ------------- 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 |
Fred in Pa wrote:Posted By: jvin248
Date Posted: 31 Oct 2024 at 6:34pm
|
. 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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Posted By: SteveM C/IL
Date Posted: 31 Oct 2024 at 11:22pm
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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Posted By: SteveM C/IL
Date Posted: 31 Oct 2024 at 11:25pm
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..
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