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#11
12-31-2010, 07:36 PM
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I'm pretty sure the crank is not the same between a K241 and a K301. If the engine does not have the "A" meaning 'special oil pan', it will NOT fit in a NF Cub Cadet. The 10 and 12 hp oil pans aren't technically interchangeable, either.
I'm going to reiterate this...get an engine that was originally from a Cub Cadet so you can avoid all this guesswork and 'will this random K-series engine fit my 100?' BS... You won't be able to rebuild the second engine while you use the original engine if you need half the parts from the first engine. Keep in mind that there are HUNDREDS of variations of the K-series engine. Many different throttle/choke configurations, crankshaft configurations, etc. Somewhere I have a pdf file that lists all of the different K-series crankshafts and what spec numbers they are used on or something like that. That PDF has a couple hundred pages, at least. There is no 'I' suffix for the model number. Here is the complete list: A - special oil pan C - clutch model G - generator application P - pump model Q - quiet model R - reduction gear S - electric start T - retractable start ST - electric start and retractable start EP - electric plant (This list would be great to have in the Tech library, since this is being discussed in multiple threads at the moment and comes up rather often.) 
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#12
12-31-2010, 08:56 PM
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I'm changing my earlier statement in this thread about starting with a naked block...
There were at least two different Kohler blocks, a wide base and a narrow base, I do know that some JD's used the wide base block, not being into "off color" tractors I don't know what ones used what engines, but you will be well served to learn to tell the difference before you start a project with a "different" block. Sorry for the mis-information in my earlier post. And Yes the 241 and 301 cranks are different... No wait, the wrist pins are different sizes, CRAP I don't remember for sure now. Someone else help me out here...
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#14
01-01-2011, 08:56 PM
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Attached is a pic of a K341-S Spec#71309
This engine is installed in a 782 that I picked up a while back. You can see the the base/oil pan has a flat bottom and flanges for the mounting bolts. It also has a fuel pump. Crank diameter is 1.125". Width of the base is approx 11.5". Doubt that the base/oil pan could be altered or replaced to make it narrower, as the block has the flanges cast into it. Another thing to look at is the fact that the flywheel shroud does not have the oval cut-out for the AQS air cleaner tube! Cub may have been the only manufacturer to spec the "supercharger" cut-out. But, I'm not certain. Guessing that it came out of a Gravely, but I think(?) that JD blocks are the same. It's not impossible to get one to fit a Cub, as I have seen it done on a 1450 (NF would be a whole other talk show). Just not sure if it would be worth the effort on your part if you were only looking for a rebuild project. Bottom line is that I'd look for an AQS engine. There's my two cents!
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#15
01-01-2011, 11:07 PM
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I have a k321 block out of a john deere and the base is identical to that. Same pipe deal to
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Nick.  Cub cadets 100, 125, 86, 108, 109, 128, 129, 129, 149, 149, 169, 1450, 1650 and a handfull of parts tractors. #40 box blade, ih back blade, rear ih rock rake, #2 cart, windbreaker soft cabs, windbreaker hard cab, cozy cab, kwikway loader , wards corn planter, brinly plows, culitvator, rear blade, disc and the usual decks, snowblowers and 2 tillers
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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