340 utility

mattofvinings · Jun 18, 2009

I'm going to look at a 340U, purportedly with a spun rod bearing...

...which brings up the obvious concerns of a trashed crank or a hole in the side of the block.

However, looking for other potential weak points or info about impossible spares in a 340U?

The basic architecture would seem to be based on the Farmall C but I'm guessing the C135 gas engine in a "C" is considerably different from a 340?

Thanks in advance.

Hugh MacKay · Jun 18, 2009

Matt: Actually the only thing on that tractor similar to a C is the engine. Same block as used in tha Super C.

The rest of the tractor is basically 300, newer version of the H with IPTO, live hydraulics, TA available.

240 is the tractor that fall in the line of C, SC, 200, 230 and finally 240.

mattofvinings · Jun 18, 2009

Thanks Hugh, the only basic change I can see from reading/searching is that the 340 has a 7.6:1 compression ratio vs. the 5.?:1 ratio of the older "C" iron.

While that change might be partly done with a new cylinder head chamber design I'm not so worried about the head....its the block and crank depending on what got trashed during this low-lube event I've heard about. If it is as simple as getting a good SC block and lower end and using the 340 sleeves, rods, pistons and head, I'm there

.

IH fan · Jun 18, 2009

Same block, but the SC-200-230-240 is 123cid instead of 135, so bore and/or stroke must be different.

Hugh MacKay · Jun 18, 2009

Matt: While the block is the similar, it uses 14 head bolts rather 9 as in C, SC, etc.

The 340 uses thiner sleeves giving a 3-1/4" bore compared to 3-1/8" in Super C. The crank and rods differ in that stroke is longer, so larger swing on crank and shorter rods. The crank rods and 3-1/4" pistons will fit the Super C block, but you'll require a 9 bolt head.

Hugh MacKay · Jun 18, 2009

IH Fan: Different bore and skroke, read what I said to Matt. You can buy a 3", 3-1/8" and 3-1/4" bore sleeves and pistons for that block. There are two different cranks and rods.

The other item is they added more head bolts for the C-135 engine.

Hugh MacKay · Jun 19, 2009

Matt: When I first responded to you, I should have said, "340 has same basic block as Super C". There are the differences I outlined and the two blocks will have different part numbers.

To go one step further it is the same basic block as used in A, B, SC, SC, etc. in swathers, 404 and even 504. One basic block and going from 17 to 45 hp. Then you have the H, SH, 300 and 350 basic block, much heavier, yet it started off around 27 hp in the H, ending at 40 hp in the 350. Just a case of small block and big block.

All companies did this, several horse power ratings out of one block. For the most part, the blocks were more successful at lower ratings. The small blocks like the 340 were a good point. That engine ran forever and a day in the offsets, probably a lot of them gave 5,000 hours of service before rebuild. I'm betting tractors like 404, 330 and 340 were under 3,500 hours on average. The owner of a 504 was lucky to make 2,000 hours. I know my 504 was rebuilt at 1,500 hours.

340 utility

mattofvinings

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Hugh MacKay

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mattofvinings

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IH fan

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Hugh MacKay

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Hugh MacKay

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Hugh MacKay

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