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#1 FrozenInTime OFFLINE  

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Posted September 13, 2020 - 05:15 PM

I just had the top of a piston come off in a Wisconsin AEN engine.  No damage other than the top of the piston.  Looks like it cracked/separated around the bottom oil ring.  I can find a piston on fleece-bay, NOS but it list them as DB-209-5 S10, S20, etc.  The parts manual calls it a DB-209-5.  What is the S10 or 20, etc? 

Engine ran great until this, was rebuilt before I received it 8 yrs back, have ran probably 40-50 hours a year on a log splitter.



#2 classic OFFLINE  

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Posted September 13, 2020 - 05:42 PM

S10 means.010 oversize and S20 means .020 oversize.
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#3 FrozenInTime OFFLINE  

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Posted September 13, 2020 - 05:57 PM

Had a feeling that's what it was.  I have no idea which one I would need, I suppose their talking about rings.  I will have to figure out what size it needs.



#4 classic OFFLINE  

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Posted September 13, 2020 - 08:03 PM

If your piston is oversize it will be stamped .010 , 020 , or 030 on top of the piston. Best thing is to measure the bore to be certain.
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#5 FrozenInTime OFFLINE  

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Posted September 14, 2020 - 07:12 PM

All it says on the piston is *0*.  This means stock size?  I'm not good with a mik even though I have one.  The piston is 2", just past the 9 (right below the 3" mark) on the slide and dial says .0070, the bore is at .0075.  I thought this was supposed to be a 3" piston so I'm missing something.  If I'm thinking right, it's .0030 shy of 3".

 

I will see if I can find a piston/rings not oversized, stock?



#6 FrozenInTime OFFLINE  

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Posted October 06, 2020 - 05:46 PM

Found a stock piston, replaced it, very simple engine to take apart.  2nd pull, she fires up and so far, is running better than before.  Now fires up, hot or cold, ran out of gas and filled, on first pull every time.  Split a cord of wood today and did not miss a lick. :-)


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