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I Have A 12Hp Kohler If I Rebuild It To .30 Over Will Anything Break


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12 replies to this topic

#1 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 02:56 PM

If i put alot of money in the engine will the old rod break



#2 LilysDad ONLINE  

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Posted June 27, 2013 - 03:00 PM

If your going to put a lot of money in the engine, why not replace the rod, too?



#3 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 03:03 PM

if i just use a .30 over piston



#4 KennyP ONLINE  

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Posted June 27, 2013 - 03:05 PM

If you are going that far, I'd put a new rod in it.



#5 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 03:09 PM

will a .30 over rod fit on the old crankshaft



#6 LilysDad ONLINE  

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Posted June 27, 2013 - 03:11 PM

Kohler makes one for it, it will work.



#7 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 03:13 PM

will the kits on eBay work

#8 WNYTractorTinkerer OFFLINE  

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Posted June 27, 2013 - 04:37 PM

So the piston is .030" oversize..  The old rod will work as long as the rod-to-crank clearance is OK and isn't out of tolerance..  Get some plasti-gauge to check..  If the crank is machined down the rod is smaller (ie- .030" under)


Edited by WNYTractorTinkerer, June 27, 2013 - 04:38 PM.


#9 superaben OFFLINE  

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Posted June 27, 2013 - 05:03 PM

If you are spending the money on a new piston, new rings, and the boring as well as all the other things you should do to make sure the engine's last leg of life is good, don't skimp by forgetting to replace the rod.  It shouldn't be that expensive, and you will have peace of mind.

 

Ben W.


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#10 pharmer OFFLINE  

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Posted June 27, 2013 - 05:31 PM

Any cast iron Kohler is worth it. Do you have to go.030 over? Measure it first . Going .030 over is not going to gain HP. Besides, kits on Ebay are around $90 and includes the rod for .010 or .20 over. .030 over adds another $20. Measure first, bore and crank and go from there.

#11 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 06:37 PM

I will be using it for pulling. I also want the head worked

#12 pharmer OFFLINE  

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Posted June 27, 2013 - 08:02 PM

Head work,porting, 3 angle valve job, and flowing the carb better is what can be done to these great engines. Visit Brian Millers page if you haven't done so yet.



#13 searspullingtractor OFFLINE  

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Posted June 27, 2013 - 08:20 PM

I did




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