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Allis Chalmers Discussion Forum

1945 Allis B

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03-19-2010 15:52:31

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Is is possible for the engine oil in a 1945 Allis B to leak into the coolant and not leak coolant into the engine oil?


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03-20-2010 05:48:17

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
There is no real oil pressure in the head. Only free fall oil from the rockers. No real pressure in the rocker arms only the head pressure from the weight of the oil from where it enters the head to the top of the rocker arms where it free flows out the top.

Pressure is only built from the oil pump to the filter where it free falls over the lifters to run back into the pan. That pressure is regulated by at ball in the stem of the oil pump. The highest volume of oil from the pump flows by the ball in the stem into the center of the pump to free flow out the center of the cam shaft an into the pan. The only pressure to oil the engines main, cam and rod bearings is from centrifugal force cause by the spinning cam shaft as the oil passes thru the center of the cam to the front.

The oil path shown by the red wire.

If you have a good radiator cap you will have more water pressure in the engine than oil pressure. You would have water in the oil as well as the radiator from a head gasket or a crack in the head or block.

That is just the way this engine is built. It can not be compared to any other engine oil or water mix.

third party image

That kinda rules out the head gasket.

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03-19-2010 20:34:32

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
I figured it is probably the head gasket, but I was hoping that I grabbed the wrong yellow antifreeze bottle when I topped off the antifreeze and put in some oil instead. There is no water in the oil.

Looks like the head gasket is not too hard to replace.


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03-19-2010 19:15:24

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
yes it is possible. but the oil pressure on a B is only 10 psi in most places, and the water pressure is slightly below that. not as much difference as an automobile. also the head is lubed from an external tube, not pressure up thru a passageway in the head gasket. if your getting oil, i also would guess head gasket as thats about the only place it could possibly happen.

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ASE guy

03-19-2010 18:26:53

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
You fortunate if it's not in the coolant. If you continue to run the tractor, monitor the oil condition for coolant. Coolant in the crankcase with oil can wipe out the main and rod bearings rather quickly, then you have a much more expensive repair. I'd fix it soon while it's still a headache and more easily manageable. Also, when you remove the head, try to determine the CAUSE for the failure then, after the repair, use fresh coolant mixed with 50/50 antifreeze/water unless it gets to below -34 degrees farenheit. If it does get colder in the winter go 70/30. Antifreeze does much more than lower the freezepoint it also protects the metals in the cooling system. I've done quite a few head gaskets eaten through by antifreeze that has turned acidic.

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03-19-2010 17:36:59

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
sure, your oil is under pressure and can squeeze through a crack in an oil galley or weak gasket whereas your coolant might not be able to as it is not under any pressure, or very little. Happens all the time.

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Ralph from NY

03-19-2010 17:34:20

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 Re: 1945 Allis B in reply to carbonfibers, 03-19-2010 15:52:31  
Yes a head gasket will do that.

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