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JD M Engine / Year

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Steve

01-13-2001 10:58:10




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Trying to get a handle on the year the engine in my M was made. Someone thought that the motor may have been from a 40. I searched Todds jd 40 page, but didn't find my engine number listed there. Can't find an M engine number list on the internet. The engine is Number 38618 (casting M64T). The tractor (1951) is M45922. If anyone can tell me exactly which model this engine number corresponds to, and the year of manufacture(or where I can look this info. up) I would appreciate it.

Thanks, Steve

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Frank

01-14-2001 04:42:46




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 Re: JD M Engine / Year in reply to Steve, 01-13-2001 10:58:10  
I have a m that has the temp sensor in the water manifold that is bolted on the head.



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The Stranger

01-13-2001 21:14:25




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 Re: JD M Engine / Year in reply to Steve, 01-13-2001 10:58:10  
Engine numbers for the "M" series tractors started with 10001. Due to production line procedures, the engine number and serial number of the tractor seldom if ever coincide. The engine numbering sequence was the same for all "M" series tractors. Hard to prove absolutely, since the early "M" serial number records no longer exist, but an educated guess would place your block as being cast in 1949, most likely

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Bus Driver

01-13-2001 13:43:39




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 Re: JD M Engine / Year in reply to Steve, 01-13-2001 10:58:10  
Far from being an expert, I will offer what I believe to be (some of) the facts. The M64T block was used for the M and 40 as original equipment. This block was later replaced with some other numbers and offered as repair parts through the dealers. The later M blocks had the temperature gauge sensor installed at the rear of the block just below the cylinder head. The early M had the sensor somewhere else and it read temperatures higher than they really were. I do not know at what serial # this change was made. I do not know where the temperature sensor is on the 40 block. The internal parts are mostly different between the M and the 40. Crank, cam, pistons, connecting rods. The 40 used a different cylinder head and carburetor. This post will be too long if all the differences are listed. I believe that a bare block M64T will accept the internal parts of either an M or a 40, but most of the internal parts from an M and a 40 will not interchange. The 40 had larger connecting rod journals, for example. Hope this helps and that others will offer more info. I would like to know how to interpret the casting codes.

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Steve Renner

01-13-2001 16:40:43




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 Re: Re: JD M Engine / Year in reply to Bus Driver, 01-13-2001 13:43:39  
Here is a quick follow up. On my block (casting M64T) the heat sensor is near the top of the block, just below the head on the left side of the back of the block.

I looked at the crank shaft this afternoon, and it had a casting Number of M450T. I have been told that this is the casting number for an M. Supposedly, the 40 had different casting numbers... at least 2 or 3.

What with the crank casting Number, I am pretty sure that this is an M engine. Would still appreciate any thoughts or info anyone would have.

steve

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Bus Driver

01-14-2001 10:22:14




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 Re: Re: Re: JD M Engine / Year in reply to Steve Renner, 01-13-2001 16:40:43  
Thanks to Frank for posting about the temp sensor location. Steve, M450T is the crank for the M. In the 1963 parts book, the 40 crank is M3114T, ordered as part# AM 3012T. Main bearings are the same for the M and 40. The 40 crank could be used in the M, but would require using also the rods from the 40. The 40 crank is unusual in that the connecting rod bearings are larger than the main bearings. I would suspect that the larger rod bearings in the 40 and the change to aluminum (40) pistons from the cast iron (M) resulted in longer rod bearing life for the 40. I have not completely disassembled one of these engines, but will do so shortly. Will need advice from this forum!

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