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Serial#model B

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Bill

02-15-2002 14:00:13




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Where is the serial number on a model B? Iknow on the h and m they are on the bellhousing but I can'tfind the one on our old B. Thanks




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big fred

02-15-2002 14:14:25




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 Re: Serial#model B in reply to Bill, 02-15-2002 14:00:13  
It should be on a metal plate mounted to the left hand seat bracket.



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Bill

02-15-2002 16:28:59




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 Re: Re: Serial#model B in reply to big fred, 02-15-2002 14:14:25  
Fred thanks alot but the tag is no longer there, I think its a older model as it has no water pump on the engine,it does have a starter. Is the number stamped any where? Thanks again Bill



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Dave_Id

02-15-2002 18:07:43




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 Re: Re: Re: Serial#model B in reply to Bill, 02-15-2002 16:28:59  
Some, but not all earlier Farmalls ser.# matched the engine ser.# located on flat milled spot above #1 sparkplug.



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Tom of MN

02-15-2002 19:04:03




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 Re: Re: Re: Re: Serial#model B in reply to Dave_Id, 02-15-2002 18:07:43  
Bill,

I have a 1939 Farmall B and the serial number is stamped on a plate mounted to the brake-locking mechanism on the left side of the differential housing. If it's there, you cannot miss it. Bs and As didn't have water pumps. The serial number on the plate is 1540 while the number stamped on the engine starts with an M followed by six digits and a G.

Tom of Minnesota



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Jim Becker

02-15-2002 19:47:08




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 Re: Re: Re: Re: Re: Serial#model B in reply to Tom of MN, 02-15-2002 19:04:03  
Serial number 1540? You probably are reading the engine RPM, which is also stamped on the serial plate.

Most A/Bs have the serial plate riveted to the right side of the left seat bracket. The earliest ones had it riveted to the shield below the front of the operator's platform. The engine number is stamped on the right side of the block, top edge at the front. This would be BELOW the spark plug, as the plug is screwed into the head. Engine numbers and serial numbers matched until close to the end of A/B production (up to serial 201000).

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Tom of Minnesota

02-16-2002 18:30:41




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 Re: Re: Re: Re: Re: Re: Serial#model B in reply to Jim Becker, 02-15-2002 19:47:08  
Jim,

You're right. The serial number is on the upper right of the plate. However, as I said, my plate is riveted to a bracket on the left side of the differential housing. My number is 207803. Thanks fror the clarification.

Tom of Minnesota



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Jim Becker

02-16-2002 20:35:55




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 Re: Re: Re: Re: Re: Re: Re: Serial#model B in reply to Tom of Minnesota, 02-16-2002 18:30:41  
Serial 207803 is a Louisville tractor built in 1947. But what bracket is your plate attached to? When they came out of the factory, there was no bracket bolted to the left side of the differential housing. The only thing bolted to the left side of the entire transmission/differential case was the left differential shaft housing.



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Tom of Minnesota

02-17-2002 17:46:22




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 Re: Re: Re: Re: Re: Re: Re: Re: Serial#model B in reply to Jim Becker, 02-16-2002 20:35:55  
Jim,

The bracket obviously was made and attached by a previous owner. It's made of plate steel, was cut with a torch and has a sort of "S" shape to it. It's fastened to the transmission housing with one bolt that holds the axle housing in place. I have no idea what it was used for, but it's painted Farmall red, is out of the way, has the ID plate riveted to it, so I just left it. I bought the tractor in 1972 and it's been a good performer. However, antifreeze has been leaking into the crankcase, so I pulled the head the other day and discovered a long crack in the top of the block that runs from one coolant port to another, then to the sleeve of cylinder No. 2, then back to a coolant port, then to another coolant port, then back to the sleeve in cylinder No. 3, then back to another coolant port and then to another. There also may be a crack in the bottom of the block because antifreeze in the opened block appears in a plastic cup below the oil drain. Thanks to the Internet, I've found a couple of possible blocks. Once I get one, I plan on doing a complete overhaul. Incidentally, the engine coolant never froze while I've owned the tractor, so I suspect the crack was a product of metal fatique or some other natural phenomenon.

Thanks for your interest and help. I always thought my tractor was a little older than a '47 model because it still has a magneto. When did International switch to distributors?

Tom of Minnesota

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Jim Becker

02-17-2002 19:26:18




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Serial#model B in reply to Tom of Minnesota, 02-17-2002 17:46:22  
The crack you describe sounds a lot like the typical freeze cracks on that engine. It may have been cracked before you got it. The repeated heat/cool cycles over the years you have used it may have finally made the crack open enough to let coolant get into the oil. Usually they will also show on the outside of the block, but not always.

IH went to distributors in 1950. All A/B models came with a magneto.

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