What block is in my 48 M?

R Weld · Sep 18, 2014

This is a pic of my 48 Farmall M block. My Dad has a 47 M and we have a 57 450. The 47 has a 264 block out of a Super M or 400, the 450 has it's original 281. The 48M and 57 450 both have the displacement casting numbers in the same place, but my 48 M does not. Could my block be a real early production pics? I have included a pic.

R Weld · Sep 18, 2014

Here is the 47 M with 264 block.

R Weld · Sep 18, 2014

47 M block

R Weld · Sep 18, 2014

1957 450 block with original 281.

D beatty · Sep 18, 2014

Looks like a replacement block that numbers were ground off and new number stamped in it.

R Weld · Sep 18, 2014

Okay...but there is no evidence of any grinder work..pretty easy to see on cast iron...And the raised boss, to the right of where the engine displacement casting number is, is not there. I'm really puzzled.

D beatty · Sep 18, 2014

The first M blocks were 248 and I don't know if the block was marked. The 51 M we had had a 264 block in it which we put the 281 kit in it.

John M · Sep 18, 2014

This block looks like an IH replacement block, since the part number has been ground off and stamped. BUT that casting date looks like a K, which would indicate a 41 block, which I guess could have been a factory rebuilt 41 M block?? Is that K or X? Whats the serial number on this engine?

John M · Sep 18, 2014

Forgot the other block - Its proabably an IH replacement block as well, again I see the part number ground off and stamped, and thre casting code is X on this one, so its a 54 block, or cast in 54. My M has an IH replacement block for an "M",(No displacement number) but the internals are not. All the part numbers on internals were for a 450, crank, cam, bearings, etc. The sleeves and pistons matched the 450 specs when it was rebuilt back in the 70s. Dad put what was in it, back in it except for the cam, which came out of another 450 by the part numbers. (I think that was right, I was only like 7 or 8 when Dad did that, but he always said that is the way it was.)

D Slater · Sep 18, 2014

Can't be sure, but the first block has a replacement block number stamped in for a row crop tractor. Some clues would be a small plate retained by 2 bolts near carburetor on the block. A dipstick or opening drilled for one in the block with a plug in the hole and no engine serial number. Probably cast in 1964 since block # 6943DJ or the original M block casting # suffix was lower than DJ in 1941.
C-264 block was cast in 1952 and I don't recognize that number they stamped in. Should be a 356980R1 or a replacement block # 365586R1. Looks like it has a engine serial number and may have started as a SM or SW6 engine. Could be a service engine # stamped in, but don't think so.
The C-264 block would have originally had a raised casting number like the 281 block before it was ground off. But it would have ended in R1 and be one of the 2 numbers I posted above.
Almost all 248 blocks didn't have the size cast on them. There is some that did, but a small percent.
If the raised place to right where the engine serial number is on the C-264 is the place you question? On a c-248 the serial number was on a similar raised place on toward the front of the engine. If that engine has one. On the 248 the original raised 4 numbers before the DJ were ground off.

mkirsch · Sep 18, 2014

What do you mean, "no evidence of grinder work?" It's right there plain as day in your first picture. "6943DJ" the area where the 6943 is stamped is clearly ground off.

What is the date code on that block?

John M · Sep 18, 2014

Didnt catch the DJ on the bock, so yes, its a 64 cast block. Dont know where I got 54 on the X. Thanks for clearing that up!

CenTex Farmall · Sep 18, 2014

Looks like the date code on this block is "10-22-K" Which would make it a '41. Also appears to have the earlier large oil filter housing which would have been on a '41.

None of the M's I have laying around have "248" cast on them except for a replacement block made in '59, long after production ended.

D Slater · Sep 18, 2014

I noticed the early filter housing. Reason I can't be sure what he has is blocks 6943 and original type 6722 were only up to block casting suffix DG in 1943.
If block has a serial number or other things I mentioned it would help ID it.
Agree lots replacement blocks cast a good bit later than production used C-248 and sometimes a different casting #. But I think IH had more than one foundry cast some replacement parts later and not all ended up the same way.

S2710 · Sep 18, 2014

I have a 1947 M and my motor has been ground off and new numbers stamped in. Would my block be a 1958 or newer. The number that is stamped where the block is ground off is 6722-DH. The number stamped under the no 1 plug is FBKM105778, the number on the plate on the tork tube is FBK148XXX. It also has a plug in the boss where you can put a dipstick. Just wondering if that is a replacement motor or a transplant from something else. Thank You

Bob

D Slater · Sep 18, 2014

Can't be positive, but think the date code ends in a O and the casting for the O didn't turn out real good. Serial FBKM105778 was installed in a early 46 M tractor. So nov. 45 engine cast date would be about right. Just speculating that a problem came up when they were building the tractor and they grabbed a power unit block that had a different casting number than a regular M, so they stamped a regular M casting number on the block. 1958 cast block would have a higher suffix than DH.
That's my best educated guess. Will look at some notes I have to see if the DH suffix was used in in 45 and the latest that suffix was used. Let you know.

CenTex Farmall · Sep 18, 2014

I'm catching up with you now. The DJ with a "K" year could be up in the 60's then? That makes sense.

Working on an M now that I bought back in March. Has a replacement motor with "H" casting date. It makes noise now and so far looks good. I'll look at the suffix on it. The head has an "H" too and later type part #.

When I pull the valve cover again I'll take a photo and post it.

R Weld · Sep 18, 2014

For some reason, I can't post my newest pic of the block. Looks like the date is 10-22-W.

D Slater · Sep 18, 2014

If its a W instead of a K that changes things. Does the engine have a number stamped in on the raised place below the first spark plug. DJ suffix blocks were used in 51?

D Slater · Sep 18, 2014

Looked at some tractor information I wrote down. Farmall M serial number 148550X1 assembled in the last month of 1947 used engine # 145150X1. Your engine # should be 145052 to less than 500 above that.
M 110502 used engine # 109192 date 6-4-P cast # 6722DH.
M109977 used engine 108667, date 6-5-P cast # 6722DH.

R Weld · Sep 18, 2014

Here's the pic.

R Weld · Sep 18, 2014

Here's another pic.

R Weld · Sep 18, 2014

It says 6943 DJ. Date is 10-22-W.

R Weld · Sep 18, 2014

And there is a 3 below to thright of the 6943-DJ stamp mark.

R Weld · Sep 18, 2014

Mkirsch, I was referring to the area where
"264" and "281" are cast into the
block...there was no evidence that those
casting marks were ground off the block.

D Slater · Sep 19, 2014

See the raised place on the block below the 10-22-W. Following along the top of that tin cover look at the matching raised place behind the coil in the picture. It would help to know if there is any stamped letters and numbers there.
Since the date code in the first pictures looked exactly like a K I made a mistake on some answers. That block was cast in 10-22-1951 and probably was a 6722DJ block before they ground the numbers off and stamped in 6943. If it doesn't have a dipstick hole drilled like the other poster pictured that points to a 6722DJ block originally. If it doesn't have a ID prefix or a serial number stamped in on the flat, engine side of coil, that points to a block sold as a replacement. Unless the end user stamped the block.

S2710 · Sep 19, 2014

Thanks for the info.

Bob

What block is in my 48 M?

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