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Larry Chamberlain

k301 piston rings

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Larry Chamberlain

Just ordered piston rings from Pete's small engine online and the bottom ring will not go in the grove so I can install the two thing rings that ho with it tried using the clamp no good any ideas

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rmaynard

I don't understand. Are you saying that the ring is too wide (thick) to fit, or what?

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Larry Chamberlain

Yes that's what I'm saying

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rmaynard

Is the bottom ring a single piece or 3 piece one?

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rmaynard

In any case, I have never seen a ring groove get smaller. But I have seen them get bigger, in which case the piston needs to be replaced. Did you check to see if you might have carbon build-up in the groove? If the groove is okay, and the ring is too fat to fit, I would send the rings back to the seller. Did you buy aftermarket or Kohler brand?

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Fordiesel69

I know what the problem may be. 

 

Does the piston look like this:

https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1920&bih=950&q=kohler+style+d&oq=kohler+style+d&gs_l=img.3...451678.454403.0.454652.14.13.0.1.0.0.154.1422.7j6.13.0....0...1ac.1.41.img..3.11.1160.0oQLLmwyxoA#hl=en&q=kohler+style+d+piston&tbm=isch&facrc=_&imgdii=_&imgrc=Lus6hDzyGr4zIM%253A%3BT2qyTxsSuhddIM%3Bhttp%253A%252F%252Fwww.kohler-engine-parts.opeengines.com%252Fimages%252Fpistonnewstyle.jpg%3Bhttp%253A%252F%252Fwww.kohler-engine-parts.opeengines.com%252Fkohler-engines-parts%252Fcrankcase-parts%252Fpiston-kits%3B300%3B252

 

Or this:

https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1920&bih=950&q=kohler+style+d&oq=kohler+style+d&gs_l=img.3...451678.454403.0.454652.14.13.0.1.0.0.154.1422.7j6.13.0....0...1ac.1.41.img..3.11.1160.0oQLLmwyxoA#hl=en&q=kohler+style+d+piston&tbm=isch&facrc=_&imgdii=_&imgrc=V69elS9gbhVJTM%253A%3BlISQF3yBNNdNxM%3Bhttp%253A%252F%252Fthumbs3.ebaystatic.com%252Fd%252Fl225%252Fm%252FmgDRDaaS5XzutV-aQvvlyEA.jpg%3Bhttp%253A%252F%252Fwww.ebay.com%252Fbhp%252Fkohler-k301-rings%3B225%3B179

 

If the wrist pin boss is dished in, then you need to order style "d" rings.  If the wrist pin boss is not dished, then you need style "a" rings.  These are not in any way interchangeable.  Also a genuine kohler piston may not accept the china rings, and conversely the china pistons may not accept genuine kohler rings.  You will need to check what you have.

Edited by Fordiesel69

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Larry Chamberlain

Well I'm gonna send them back and order the ten over piston and rings these a score on the wall I'm gonna hone out can I hone the wall from std to a .10 over by just honing

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rmaynard

In my humble opinion, no. Not accurately. Take it to a machine shop and have it done right.

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groundhog47

Honing it with the 3 blade type you are likely to "egg" shape the bore, "dingle berry" hone may work but takes hours. I did a Tecumseh .030 over, cast iron sleeve and almost wore out "dingle berry" hone and almost wore out drill press. I wouldn't do it again. The hone was given to me but they ("dingle berry") are expensive and not all size inclusive either. All in all your perceived or incurred cost and actual cost are about same.

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Larry Chamberlain

OK so I'm gonna find a machine shop and order a ten over piston for it oh another thing my wrist pin is a little tight will that loosen up with club or not

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gregg'shorses

Get the new piston first and then take it with the block to the machine shop.

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rmaynard

Take the block to the machine shop first. Have it professionally measured. Then, and only then, after the shop tells you what piston you need, order the piston and rings. Don't have it bored until you have the new piston. Take the piston and block together to the shop.  A good shop will bore to the size of the new piston.

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Larry Chamberlain

Yeah that's what I'm doing um I'm getting it from Pete's small engines online I have to send the rings back cause they won't fit and I only could find a email address I was like are you kidding me Lol so I emailed them and see what happens

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shorts

what Bob Maynard said take it to a machine shop have them measure it and give you a price with your parts and with their parts, if they can match your parts cost and shipping you might as well give the local guy the business

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Fordiesel69

There is a ton of opinions on taking it in first or buying the piston first.  With these kohlers, typically the next size above is just fine.  Of 2 cycle engines, more often than not, you need 2 or 3 sizes bigger as they are heavily damaged.

 

A 0.010 oversize will be bored out to a 0.0145 to 0.0165 anyways, so there should always be room unless you ran it loose and a skirt broke off.

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