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  #1  
Old 04-25-2012, 03:40 PM
rickv1957 rickv1957 is offline
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Default Kohler Piston Question
Hello,
I have my engine apart (K-321A 60166d) and noticed there is wear on the the side of the piston near the valves.You can see shavings in the oil pan. First what is the correct piston # to order for this? I see in the manual it is a style A. And also what would cause this?
Thanks
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  #2  
Old 04-25-2012, 04:42 PM
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Matt G. Matt G. is offline
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The wear on the skirt is completely normal; the erosion above the top ring is not and is likely from overheating or a lean mixture.
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Old 04-25-2012, 04:52 PM
Merk Merk is offline
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I agree with Matt.
You need to measure the cylinder bore in 6 places and them decide if your engine needs bore to next size. I use a bore gauge and a micrometer to measure the cylinder bore.
Measuring cylinder

Micrometer and bore gauge


I would take your engine to an automotive machine shop if you don't have the correct gauges to measure the cylinder.
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Old 04-25-2012, 08:39 PM
Vince_o Vince_o is offline
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Matt and Dale are right on.
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Old 04-25-2012, 08:45 PM
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Matt and Dale are right on.
Jeff the machinist agrees also
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Old 04-26-2012, 06:26 AM
Vince_o Vince_o is offline
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Jeff

Ol Dale has tought me alot over the last 6 yrs or so. Hes a smart man. Only got to meet him once, and if you do get a chance to meet him youll make a friend right off.
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Old 04-26-2012, 11:38 AM
rickv1957 rickv1957 is offline
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Hello Men,
Thanks for the replys. I measured the bore with a Brown & Sharpe intramic.I have been a tool & die maker for 30+ years so I have access to some pretty neat tools. The bore measures 3.5014 at the top and gets smaller as I go down. Its 3.5000 towards the bottom. Good shape still well in tolerance.No one answered about a replacement piston. Not sure what one to buy.I see on E-bay the prices go from $23 to $140+ (includes wrist pin and rings.) In my manual it shows 3 different styles but no part #"s. I see also that there were different width c-rods. Mine mics 1.166 at the top where the wrist pin goes through.Thanks again for all your help. Rick from PA
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Old 04-26-2012, 04:54 PM
Merk Merk is offline
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Hopefully you measured in 6 places like the Kohler manual shows. Max taper is .002. Yours is .0014. Yes it is in spec.....high side of spec.

Your bore may in tolerance right now. It won't be after you hone the cylinder wall. Since you need a new piston I would go with an .010 over piston.

I would stay away from the epay specials. Sometimes you get a good one and sometimes you don't. Not worth the gamble in my book.

To rebuild this engine the right way you will need a
gasket kit
piston and rings
governor-if it is a plastic one-K321s came only with a plastic governor gear
connecting rod-need to measure the crank journal-sometimes the crank journal needs turn .010 under stock spec.
points pushrod
I will replace the head bolts, bearing plate bolts and oil pan bolts.
I would check the valves-they may need ground or replaced

part number for piston-I give the place where I order my parts (small motor shop) the model-spec and serial number. He orders the parts for me. Sometimes I'm asked if I want Kohler or Stens parts. I only use Kohler connecting rods. I had problems with Stens in the past.
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Old 04-26-2012, 06:07 PM
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Jeff

Ol Dale has tought me alot over the last 6 yrs or so. Hes a smart man. Only got to meet him once, and if you do get a chance to meet him youll make a friend right off.
Agree with you there Vince! OCC is truly the "meat and potatos" of any Cub Cadet enthusiast!
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Old 04-26-2012, 08:41 PM
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Jeff

Ol Dale has tought me alot over the last 6 yrs or so. Hes a smart man. Only got to meet him once, and if you do get a chance to meet him youll make a friend right off.
Just the little bit of interaction here with him, he has shown his knowledge. Hopefully we'll meet sometime.

Quote:
Originally Posted by Merk View Post
........snip.

Your bore may in tolerance right now. It won't be after you hone the cylinder wall. ..snip.........

When I went to measure my K301 from my 122, I honed it first and then measured. It was still on std bore with .0008 taper.

It's great working in a machine shop, I set up a dial bore gauge
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