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Allis Chalmers Discussion Forum
:

which head?

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CumminsMan

12-13-2015 07:04:26




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Have a 53 WD. Original engine had short head, dropped a valve and took out a piston. Local Allis man had complete engine which we slid in, has tall head. This engine needs rings bad, so I wonder when rebuilding which head to use?




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DrAllis

12-14-2015 06:24:58




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
I think the old short head is 3 inches tall and the newer tall head is 4 inches tall. Your overheating problem isn't related to the head. I'd guess your problem is from a 63 flywheel HP engine being cooled with a radiator made for 43 PTO HP.



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jr1983

12-15-2015 03:57:04




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 Re: which head? in reply to DrAllis, 12-14-2015 06:24:58  
The d17 engine which has been tampered with and dynoed at 72 is in my wd and you can pull its guts out and it won't get close to over heating. My old wd 45 that has had at least three one piston overhauls. Two crater pistons and two flat and pretty worn. I bought it without a head. I used the head off my wd's old engine on it. It tends to run hot. I put a radiator in it that helped a lot but if I pull it half as hard as I do the other one it gets to the red.

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jr1983

12-14-2015 03:58:40




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
How do you tell tall head or short head? My 45 has a head off my WD on it. (It has a combine engine in it.) My 45 tends to run hot under load. Im wondering if the head and this symptom are related.



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Brian G. NY

12-13-2015 08:57:03




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
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Thanks, I knew there had to be reasons.



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DrAllis

12-13-2015 08:36:57




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
Better cooling and working towards the "center-fire" located spark plug which worked well with the Power Crater piston in the future model WD-45 engine.



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Brian G. NY

12-13-2015 08:10:51




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
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Yep, the tall head was introduced in 1951 with "Engine" serial number WD289001.
Although, it is said there is no performance difference between the two, A-C must have had a reason to go to the trouble of redesigning the head.

Better cooling, maybe?



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DrAllis

12-13-2015 07:29:00




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
If it really is a 53 WD, it had the tall head on it from the Factory. Makes no difference in HP output. Carb size, which manifold it has, pistons/sleeves/crankshaft are what makes the HP numbers change.



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4wdtom

12-13-2015 07:24:02




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 Re: which head? in reply to CumminsMan, 12-13-2015 07:04:26  
I don't think it matters much. The tall head is an "update" but I have plenty of power in my WD and the only thing non stock is the 1/8" over bore kit which is sort of standard now. I would use the tall head if it was in good shape, but I wouldn't worry much if you need to use the other one.



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