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Kohler K301 Rebuild Questions


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#1 chris m OFFLINE  

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Posted January 04, 2013 - 04:02 PM

I am having my K301 bored .020 over for the rebuild.

 

I am wondering if anyone else has had this done to a K301 before? As I am wondering on the piston to sidewall spec.

 

The book calls for 3.395 as .020 oversize

 

Piston to wall clearance for style C & D pistons show .0045 - .0062

 

But for the style A piston I read it requires .007 - .010 with a recommended .008

 

I have the style "A" piston, .008 seems large to me?

 

And if I go with this size it brings the bore to 3.400 and the ring gap would be .030

 

Does this sound right??

 

 



#2 DougT ONLINE  

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Posted January 04, 2013 - 04:36 PM

Chris, Are you measuring the piston skirt? Most generally when you go oversize everything would be designed to work. just wondering if the skirt wouldn't measure closer to 3.385?  I never punch one without the replacement piston in hand. .030 ring end gap would be way too much in my book! 



#3 chris m OFFLINE  

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Posted January 04, 2013 - 04:45 PM

I bought new everything. The new piston is for .020 oversize. I would have assumed that if it was bored to 3.395 that everything would be fine.

 

I told this to the Machine shop, but he said he needed the piston to cylinder wall spec. So in searching Those are the specs I found. But it just doesn't seem right to me.



#4 JDBrian OFFLINE  

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Posted January 04, 2013 - 04:51 PM

Chris, I'd give the machine shop all the info you have and the new parts and let them sort it out. If they are experienced with these engines then they should know the correct procedure. I think most machinists like to have the parts in hand before they start boring just to verify measurements. 


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#5 chris m OFFLINE  

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Posted January 04, 2013 - 04:59 PM

Chris, I'd give the machine shop all the info you have and the new parts and let them sort it out. If they are experienced with these engines then they should know the correct procedure. I think most machinists like to have the parts in hand before they start boring just to verify measurements. 

Oh I gave it all to him. And he still called asking for that spec. I guess I will find out soon if it works or if I have to order a .030 piston and rings lol.



#6 chris m OFFLINE  

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Posted January 06, 2013 - 03:06 PM

Well I sent an Email to Brian Miller. He responded quick but It was sent to spam and I didn't notice. :(

 

But anyway. He said on the style "A" piston (centered pin) that .007 - .010 is correct. He went on to say that for engines under 3500 rpm to go with the lower side .007. But to go .010 if you are building for higher rpm.

 

Just figured I would share as it seemed very difficult to find the correct spec on this.


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