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Allis Chalmers Discussion Forum
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1942 Allis Chalmer Model B

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Johnny Ray Turn

05-18-2007 00:29:21




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Hi, My Dad has an old Allis Chalmer tractor that needs some repairs. I have decided to restore it but didn't know where to start. A friend told me about Yesterday's Tractor web site. This site has helped me to learn, by serial numbers, that it is a 1942 model B. It runs well and is in fair shape, but the exhaust part of the manifold has almost disappeared and it has a few other problems. My dad has always put gasoline in it but after ordering a parts manual and seeing a "low octane fuel" intake/exhaust manifold I am wondering if that is the one I need to order. The manifold on dad's tractor does not have a cock valve, but the "gasoline" manifold in the parts manual shows one. Will it make a difference? And, what is "low octane fuel"?

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DARDAN

05-21-2007 21:41:29




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 Re: 1942 Allis Chalmer Model B in reply to Johnny Ray Turner, 05-18-2007 00:29:21  
Me thinks you fellas missed my point. When the engine has been stalled, or is fuel flooded, the cylinders already have more fuel than they can use, the mixture is too rich to burn, and the spark plugs may be shorted with gas. By opening a petcock on the intake manifold, it allows a breath of fresh air to dilute the mix in the manifold and cylinders, to the point where the mix can burn. It will even dry the plugs in extream cases. If the petcock is opened WITHOUT the stalled or flooded condition, the engine will likely NEVER start. Man, have you ever tried to HAND start a hot, stalled or badly over choked cold engine!! The petcock on the intake manifold does nothing to reduce compression, or the effort required to turn the engine. But it will let a stalled or flooded engine start with a few turns insted of many turns. Saves a lot of arm sretching on a hand start tractor, or if the battery is low. I have found it a handy retrofit on my own tractors. This is a wide open style petcock, like a gas valve, with no check valve, and about a 3/8 thru hole.

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Ted in NE OH

05-20-2007 07:14:07




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 Re: 1942 Allis Chalmer Model B in reply to Johnny Ray Turner, 05-18-2007 00:29:21  
The pet cock on a manifold could be used to provide vacuume to a milker if need in a power failure.



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steve(ill)

05-18-2007 15:15:11




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 Re: 1942 Allis Chalmer Model B in reply to Johnny Ray Turner, 05-18-2007 00:29:21  
any aftermarket manifold is o.k.,, any brand of gas is o.k. i have used 10% alcohol on occasion since it is very popular in illinois, but i normally stick with "regulaor" in the B and lawn mower. the low compression of the motor is in the piston to head clearances. if it runs on kero, it will run fine on gas, dont worry about it.



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Johnny Ray Turner

05-18-2007 20:20:34




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 Re: 1942 Allis Chalmer Model B in reply to steve(ill), 05-18-2007 15:15:11  
Just wanted to say thanks. It is good to know there is help out there.



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DARDAN

05-18-2007 08:18:37




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 Re: 1942 Allis Chalmer Model B in reply to Johnny Ray Turner, 05-18-2007 00:29:21  
Afterthought: "low octane fuel", or "distilate", was essentually kerosine. Tractrors set up for distilate had a small separate "gas" tank that was plumbed in as well as the large "normal" fuel tank. You started the tractor on "gas" and warmed it up,(180 deg) or so. Then "switched" to the normal tank "distilate" and ran and operated the tractor on it. Back before WW II, it was thought to be more ecconomical. BUT, there were some drawbacks. You had to keep it hot to run distilate, the engines were lower compression, it produced less power, you had to run hotter spark plugs, the distilate dilluted the crankcase, and when you shut down the engine, you had to close both fuel tanks and drain the carb of distilate, for cold starting on distilate was nearly imposible!! I'm sure the long term mantainace cost outweighed the percieved fuel savings. Distilate was cheaper than gasoline back then.

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Johnny Ray Turner

05-18-2007 20:22:10




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 Re: 1942 Allis Chalmer Model B in reply to DARDAN, 05-18-2007 08:18:37  
Just wanted to say thanks. It is good to know there is help out there.



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DARDAN

05-18-2007 07:46:31




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 Re: 1942 Allis Chalmer Model B in reply to Johnny Ray Turner, 05-18-2007 00:29:21  
As far as fuel goes, major brand GASOLINE is the ONLY way to go. I've had some really bad experience with off brand cheap gas, or gas that contains alcohol, poor running and HARD starting. Particularly if your use is intermitant. In my area the ONLY fuel I use, if it starts by hand, is
Marathon mid grade. The only place I've seen the petcock on the intake manifold, was a combine power unit (same engine). Opening the petcock when the engine is fuel flooded makes starting the engine MUCH easier!! You just have to be ready to close it as the engine comes to life, or it will rev up much higher than intended. I have used Bs & Cs for over 40 yr and hot, flooded, or stalled starts were always a pain. In recent years I've retrofitted the petcocks to mine, saved a lot of aggrivation.

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Dick L

05-18-2007 10:05:57




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 Re: 1942 Allis Chalmer Model B in reply to DARDAN, 05-18-2007 07:46:31  
Opening the petcock makes it start easier??

Sorry that dont compute here.

If you open the petcock before you start the engine how do you get enough vacuum to pull the gas into the engine to start?

That would be like having a blown manifold gasket.

Back in the 40"s we lost electric power quite often, when this happened we hooked a hose to the petcock and was able to pull enough vacuum to run one milker.


Unlike John Deere with the petcock in the cylinder head and with the large pistons that with the petcock open you can still draw gas into the intake, the petcock on an Allis Chalmers B is in the manifold and will not reduce the compression to allow the engine to turn freely, it will reduce vacuum.

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Johnny Ray Turner

05-18-2007 20:23:23




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 Re: 1942 Allis Chalmer Model B in reply to Dick L, 05-18-2007 10:05:57  
Just wanted to say thanks. It is good to know there is help out there.



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