Building a Kohler k321 From Parts

[oliver2-44 9,760]

Some time ago I picked up a parts K321 at an old farm repair shop that had originally been some type of blower motor.  No spec decal left, so Guessing maybe for a grain silo dryer. 

Interesting flywheel with no fins as the blower wheel provided the cooling air flow through the custom housing. 

The crank, head and oil pan had been robbed off it. The piston was stuck in the bore but didn’t take much to remove.  I cleaned the bore and ran a quick hone through it to see what I had.  The bore measures well within spec but has some pitting from sitting outdoors with the piston in it. 

So it will need to be bored. 

It is a narrow base block. It does not have a hole for an oil dip stick, so that would have to be in the oil pan. 

I went through my parts and found/cleaned up everything I need to rebuild it.   
The crank rod journal will need grinding but otherwise it is in good condition.  I have a question to make sure this is the correct crank for a K321. As I don’t know what it originally came from.   I know the large block Kohler cranks have different size counter weights per HP, but searched and couldn’t find any good information. 
so does this look like the correct crank for a k321. 

This is a 13 fin block if I’m counting right, so I think it also could be bored to a k341 if that turned out to be a k341 crank. 
 Theirs no model identifier cast into the side of the block, it just says F/6.   I recently found a machine shop that still machines old engines and the grind crankshafts. It’s 3 hours from home. But it’s 1:15 from the farm. I guess I’ll be adding a stop to or from going to see Mom. 
 

I appreciate any comments. 
 

[kpinnc 12,090]

3 minutes ago, oliver2-44 said:

This is a 13 fin block if I’m counting right, so I think it also could be bored to a k341 if that turned out to be a k341 crank. 

 

I thought 14 and 16 cranks are the same?  

Edited May 17 by kpinnc

[Achto 27,604]

4 hours ago, kpinnc said:

I thought 14 and 16 cranks are the same? 

 

4 hours ago, oliver2-44 said:

 I know the large block Kohler cranks have different size counter weights per HP,

 

Kohler K301, K321, & K341 all share the same crank with a stroke of 3.250" A K321 block can be bored to 3.75" to make it a 16HP. Many pullers use the 14hp block to build a 16hp engine. The 14hp block is preferred because the crank shaft is centered with the bore. The crank of a K341 16hp block is offset slightly from the center of the bore. Dynamic or static balancing the crank to the piston & rod can be accomplished by drilling holes in the counter weights, or welding existing holes shut. 

[ebinmaine 67,618]

I'll be following with interest 

[oliver2-44 9,760]

10 hours ago, Achto said:

Kohler K301, K321, & K341 all share the same crank with a stroke of 3.250" 

So I did some research on Partstree looking at multiple Wheel Horse spec Kohler engines of each size and come up with these crankshaft part numbers

 

K341 crankshaft 45 142 21-s

k321 crankshaft 45 142 21-s

k301 crankshaft 47 142 16-s

k241 crankshaft 47 142 02-s

 

So this indicates the k341 and k321 use the same crank. 

The K301 having a different part number isn’t fully conclusive that it’s actually a different crank. 
 

My inquisitive mind wants to find a picture of a K301 crank. 

The k241 was the most expensive @ $1076. 
 

 

Edited May 18 by oliver2-44