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Correct Piston Size For K301 Rebuild


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#1 Jkrogers OFFLINE  

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Posted December 02, 2013 - 08:07 PM

I have a cub cadet 129 I have been working on for awhile now. Engine needs to be bored .030 over. I ordered a piston assembly for a k301 from Tulsa engine warehouse that is .030 over. The new piston is about 1/8 too big. The machine shop measured the cylinder diameter and it matches to the specifications for a K241! The engine block is clearly stamped K301. Measuring the stroke it appears longer than a K241. So, is this a Cub Cadet Kohler? The new piston is also deeper than the original. What do I need to get this rig going again?
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#2 Rock farmer ONLINE  

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Posted December 02, 2013 - 09:15 PM

Kohler k241 should be 3.250 bore x 2.875 stroke
The K301 is 3.375 bore x 3.250 stroke.

What size have You got?

Joe
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#3 Jkrogers OFFLINE  

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Posted December 02, 2013 - 10:34 PM

The block is stamped "K301" but the cylinder measures to a K241.

#4 Jlaws OFFLINE  

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Posted December 02, 2013 - 10:57 PM

OK a while back on a Cub Cadet site I belong to there was some discussion about the K301 stampings on some of the Kohler blocks .

The K241 and K301 are the same block , they are just bored to a different diameter .

Long story short there are 10 hp Kohlers out there that have  K301 stamped on the block .

Some of the Kohler block castings have a lot of metal in them and I once had a 10 hp block that was so badly pitted from water standing in the cylinder , I had it bored all the way out to 14 hp std.


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#5 bowtiebutler956 OFFLINE  

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Posted December 02, 2013 - 11:04 PM

 Jlaws, is correct. You have a K241, with the more desirable thick wall K301 block. You will need to get a .030 piston for a K241.

 

Matt


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#6 Jkrogers OFFLINE  

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Posted December 02, 2013 - 11:14 PM

Thanks guys that makes sense. This engine came out of a 129.

#7 Jlaws OFFLINE  

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Posted December 02, 2013 - 11:26 PM

Jkrogers , Your engine has probably been changed at one time or another .

I bought a 169 off CL a few years back , and when I went to pick it up I discovered it had a 12hp engine instead of the 16 hp that was supposed to be in it . The model/serial number tag identified it as a true 169 .

 

You run into that a lot when buying 40 year old GT's that have gone through 3 or 4 previous owners .


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#8 boyscout862 OFFLINE  

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Posted December 03, 2013 - 07:09 AM

You should download the manual from our manuals section. I find that it is better to not order parts until the machine work is done. With the cost of shipping, I try to do a couple at a time. Good Luck, rick


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#9 Jkrogers OFFLINE  

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Posted December 03, 2013 - 08:47 AM

One problem I have had with the engine is that someone converted it from the original starter generator system to a stator. So, it had a different flywheel and shroud and I don't have those original serial numbers or any serial numbers so it is always a guess. I have got it back to the original starter generator system. I really wish I had the original numbers for it.

I guess we will go with a .030 over k241 cylinder.
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