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41 B

Damage done?

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Scott Murphy

08-02-2000 12:28:59

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I've just acquired a 1941 AC - B. It has many problems which will become the subject of later posts, I'm sure. Here's what is puzzling me at the moment.

Were all B's positive ground? This one is hooked up as a neg. ground (with a nasty little 12v. battery lead that will be changed very soon.). What steps should have been done to convert to pos. ground and is there a way that I can tell if it has been done to mine? My intention is to restore it back to it's original setup.

Also, on occasion, it will begin to smoke and spit some engine oil out of the stack. Not a ton, and not all the time (only after I got the thing home in fact!!!) Am I looking at bad rings, too light of oil in the oil bath, etc.?

Last question, the manual is on order so I can't look it up yet. What can I expect when I pull the governor cover? Will it remain in the block or will it fall on the floor in a hopeless mess that will cause endless hours of frustration and agony?

I'm sure I'll have more questions in the future and I blame you all for this trouble I'm in. The little Allis was for sale down the street so I went out on the web to see what kind of info was available. You guys had me hooked from the word go.

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Scott Murphy

08-08-2000 14:46:26

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 Re: 41 B - Damage done? in reply to Scott Murphy, 08-02-2000 12:28:59  
Just a follow-up. The battery was removed when in storage and put back in backwards. No damage done to the generator or field coil. The lights are another story but it appears to be charging and now starts off the battery! (That's a big improvement over pull starting!) I'm up and mowing which was the big issue!

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Phil Auten (TX)

08-03-2000 05:37:47

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 Re: 41 B - Damage done? in reply to Scott Murphy, 08-02-2000 12:28:59  
I doubt if there is permanent damage done. These old tractors are amazingly tough! Butch's advice is good. Get the manual before starting on the electrics.


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Paul from Michigan

08-03-2000 18:51:56

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 Re: Re: 41 B - Damage done? in reply to Phil Auten (TX), 08-03-2000 05:37:47  
Removing the governor cover shouldn't cause any major catastrophie(sp?) unless someone has not replaced the screw in the governor gear that retains it in the block. If the screw is gone, it'll run forever unless you take the cover off and the gear and shaft follow it. In that case you will have to retime the governor gear to the engine. I'd be a little careful as you pull off the cover to be sure the gear and shaft stay in place. If you have to retime, rotate your mag past impulse, turn back 1/4 turn, then forward until the points just start to open on #1 cylinder. Turn the engine to the point where the timing mark is visible thru the hole in the left side of the bell housing. Put the governor gear back in so the slot in it will roughly line up with the drive lugs on your mag. One tooth makes a lot of difference, so you shouldn't miss it. Then time the mag after you reinstall it. Once in a while you will find extra pieces of governor weights, etc. when you take the cover off. Thgen the question is "What did I miss? Where is it?"
Good luck, Paul

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David (Ala)

08-02-2000 21:13:55

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 Re: 41 B - Damage done? in reply to Scott Murphy, 08-02-2000 12:28:59  
Good luck Scott. I'm by no means an expert on tractors. However I also just purchased a "B" the other day and started in on the other end. I'm replacing oil seals, bearings and brakes on the rear wheels. When you get to that part, I may be able to give you some advice. I'm learning the hard way. Tear it out and hope everything goes back.

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08-02-2000 13:01:53

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 Re: 41 B - Damage done? in reply to Scott Murphy, 08-02-2000 12:28:59  
I will help with the generator question and let the engine 'sperts help with that one. You didn't state if it had been coverted to 12 Volt or not. If it was not converted to 12 volt and still has the original type generator and cutout relay, there is a good chance that the cut out relay is ruined and possible generator damage. Pull the cover off from the relay and look to see if the points are welded together or burnt. If so the first step is going to be removal of the generator and cutout and a trip to a good auto electric shop for testing. Don't take it to an Auto Zone or similar store for testing. Those kids have never seen a generator. IF the points look OK, change the battery cables to positive ground. Remove the drive belt and run a length of 12 Ga wire from the negetive terminal and touch it to the A terminal of the generator. This will polorize the generator and if it is OK, it will spin. If the generator "motors" when you polorize it and it does not charge, you have a wiring or relay problem. You should wait until you get the manual and compare the wiring to the diagram before you start working on it.

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08-05-2000 19:23:18

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 Re: Re: 41 B - Damage done? in reply to Butch(OH), 08-02-2000 13:01:53  
I'm restoring a 1944 AC C the only difference between the c and the b is a C is a two plow. I'm not shure what that means. Your battery should be six volt and the positive is the ground. I'm pretty shure that there all supposed to be like that.

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Scott Murphy

08-03-2000 06:43:10

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 Re: Re: 41 B - Damage done? in reply to Butch(OH), 08-02-2000 13:01:53  
Just for the record, it's still 6v. I think the guy who sold it to me just put the battery in backwards.

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Dave Kolby

08-03-2000 16:08:23

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 Re: Re: Re: 41 B - Damage done? in reply to Scott Murphy, 08-03-2000 06:43:10  
I do not think it really cares which way it is hooked up. My WD was hooked negative ground when I bought it. Started right up, ran fine, electrical worked etc. It is still the original 6v system/ To be accurate I hooked it up positive ground and it did not change anything a bit. It is a mag ignition. I was thinking you might have to repolarize the generator but I did not.


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