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Allis Chalmers Discussion Forum

'39 B

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dwm

05-07-2005 07:16:29

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Need some help--not so familiar with the ol' ACs. Have been looking at archive posts and have some questions:
1) Did a B always have the same engine displacment, or was there a serial number break?
2) Looks like compression ratio is higher for later Bs, was a '39 in the 4 or 5 to 1 range?
3) What should cranking compression be? Should be consistent I know, but wondering what spec is? Thanks for any help...dwm

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dwm

05-08-2005 21:20:27

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Re: '39 B in reply to dwm, 05-07-2005 07:16:29

Thanks all for the information, I appreciate it. Looks like we're gonnna' have to tear this one apart, No. 4 is about dead on compression and the rest are low. We'll soon figure out which bore it is.

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Andrew Z

05-07-2005 16:02:40

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Re: '39 B in reply to dwm, 05-07-2005 07:16:29

There are two types of Engines the BE which is the early one and the CA which is the newer one. The BE is 116 CI. and the CA is 125. They are real the same cast with the main diffrence brackest for the generator and other small changes. The compression for the BE is I think 5.2 to 1 adn the CA 6.1 to 1. I have a 38 B that has the 125 CI. pistons in it. Many people did thins over the years when rebuilding the BE engines. As for the Serial Number cut off to when they changed cast to the CA. I not sure but I dont think they kept the BE cast for to long. Andrew

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Rod (NH)

05-07-2005 18:57:22

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Re: '39 B in reply to steve(ill), 05-07-2005 18:17:32

Steve,

A friendly minor observation:

The parts book indicates that the B continued to use the BE engine up until (but not including) B tractor serial #B-64501. That would make the change from BE to CE engines in the B occurring during 1943. My '42B (serial B58812) has a BE engine (serial BE60390G). It still has the original engine so it confirms the parts book to some extent.

Rod

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steve(ill)

05-07-2005 19:39:18

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Re: '39 B in reply to Rod (NH), 05-07-2005 18:57:22

learn something every day. thanks Rod, never assumed they mad eht CE and BE motors simultaneously

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Rod (NH)

05-07-2005 21:24:05

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Re: '39 B in reply to steve(ill), 05-07-2005 19:39:18

Yeah, it does seem odd they would continue using the BE for a couple of years after production of the CE started. Why? That would be a nice trivia question for a real AC history expert :o).

I have never had the head off mine so I can't confirm the bore. I assume it's the stock 3-1/4" since it carries a BE serial number.

BTW for dwm:

The B/C service manual indicates the BE engine (gas) has a compression ratio of 4.92:1 and a stated compression pressure of 94 psig. For the CE engine (gas), the compression ratio is 5.75:1 and the compression pressure is stated as 115 psig. The low octane (kerosene) versions of both engines are lower, both in ratio and in pressure. The actual numbers can be all over the place, depending on how the compression test is conducted. Normally, you would not add any oil but would remove all spark plugs and hold the throttle wide open during the test to obtain the most valid readings for each cylinder. In any event, the difference between cylinders is more important than the actual numbers achieved unless they are all obviously way low from what is expected.

Rod

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