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Allis Chalmers Discussion Forum
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WD 45 overheating

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Toot

01-25-2021 10:57:49




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Acquired a WD45, timing and fuel setting are correct, cooling system has been flushed twice, new 50/50 antifreeze, but tractor overheats after running/driving for about 20 min. I checked thermostat and even removed it, doesnt seem to help. I have noticed that the other inlet on the head is plated off where perhaps a water manifold had two entries into top of head. Currently is using just one.. Not sure if thats correct.. Opinions?

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big orange

01-28-2021 06:32:45




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
Hoses good or is one collapsing?



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Aaron SEIA

01-26-2021 16:22:59




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
The WC and WD used both left side water ports in the head. The WD45 only uses the front port. I don't think that'd the problem here.

AaronSEIA



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rustred

01-26-2021 14:35:21




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
if you have a plate over that inlet no wonder its heating. post a picture so we are on the same page.



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DrAllis

01-26-2021 10:11:54




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
Correct timing is done with a timing light, shining on the bottom of the flywheel with the engine at wide open throttle speed. The mark on the flywheel will be "F" or "FIRE" or maybe "F-30". When the engine is then idled down slowly to 400 RPM it will be close to the TDC mark. The higher compression the engine is ( like a WD45), the more critical correct ignition timing is. So, regardless what you think, you do not know if it is timed correctly or if the centrifugal advance is working properly unless you use a timing light. Not saying this is your problem, but you can't say that it isn't.

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Toot

01-26-2021 12:17:45




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 Re: WD 45 overheating in reply to DrAllis, 01-26-2021 10:11:54  
👍



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4wdtom

01-26-2021 05:00:22




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
If someone has had the head off of the engine it is possible they have a wrong head gasket. I think the head gaskets for the single passage coolant water manifold had a restriction (smaller holes) in the front water passages to make more water flow to the rear of the engine and the holes in the rear of the engine were larger to allow increased flow to the rear. Maybe Dr. Allis will comment on this.

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DrAllis

01-26-2021 04:06:06




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
Tell me how you set or adjusted the ignition timing ??



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Toot

01-26-2021 07:18:03




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 Re: WD 45 overheating in reply to DrAllis, 01-26-2021 04:06:06  
No 1 cylinder to tdc, turned dist til spark on no 1 plug. Its certainly not retarded too much to cause overheating. The thing runs and sounds great.



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Aaron SEIA

01-25-2021 17:46:12




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
The WD45 did just use a single port thermostat housing. As others have said, you have something else wrong. It's almost impossible to overheat one. What are you basing the thought that it overheats on? Temp gauge, boiling over, infrared thermometer?

AaronSEIA



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Toot

01-25-2021 18:56:25




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 Re: WD 45 overheating in reply to Aaron SEIA, 01-25-2021 17:46:12  
Temp gauge needs to be replaced. Steam at cap, and boiling. It spews at cap and you can hear coolant rumbling after shutoff. I guess the only thing to do is keep flushing/backflushing system and rad. I guess the water pump is functioning properly, no noise or leaks. Ive had WDs and WCs over time and never ran into this.



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bushogpapa

01-31-2021 13:50:18




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 18:56:25  
Sounds like time to remove the radiator, have flow verified or have it “Rodded” While doing that, remove the Water Pump AND the lower “Freeze-plugs” from the manifold side.. As you Flush water through the front water-pump opening, use a stiff Wire to diss-lodge all the Sediment you can from around the Sleeves... There most likely will be plenty.. Casual “Flushing” can never remove this sediment..

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old

01-25-2021 20:49:28




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 18:56:25  
Water pump can be bad due to impellers rusted away or fan belt slipping



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Bob Bancroft

01-25-2021 13:24:09




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
WD and earlier used two, WD45 and later used just the one. You've got something else going on. We used to work a WD45 hard and overheating was not a problem.



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old

01-25-2021 11:24:29




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 Re: WD 45 overheating in reply to Toot, 01-25-2021 10:57:49  
Point gap set correctly?? Point gap can change timing a bit. You say it was flush as in how just the radiator or the whole cooling system. Me I use vinegar and fill the system and run it till good and warm then drain and back flush by way if the block drain



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Toot

01-25-2021 19:04:33




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 Re: WD 45 overheating in reply to old, 01-25-2021 11:24:29  
Whole cooling system flushed/backflushed. Point gap is correct.



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