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Oil Inside The Cylinder


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#1 superaben OFFLINE  

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Posted January 11, 2013 - 05:01 PM

I finally figured out today why my Briggs and Stratton NPR-6 cuts off after about thirty seconds of running.  

Somehow or another, the cylinder begins filling up with oil.  As well as the valve housing/adjustment.

The oil level is good.  I actually ran it a little lower than normal (3/4) to double verify.  

I'm guessing I'll be facing a piston ring business.  It's strange that the oil control ring would go before a compression ring, since the engine has good compression.  The piston has 20 oversize stamped on it, so it's been bored once (or twice).  But before I go that much farther into the engine I thought I'd ask.

Since this is my first N series engine, does anyone know of any reason beyond a bad breather that would cause this issue?  

Thanks!
Ben W. in VA



#2 DougT ONLINE  

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Posted January 11, 2013 - 05:31 PM

I can't see an oil ring filling up the valve chamber. That sounds more like a breather issue to me.

#3 HDWildBill OFFLINE  

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Posted January 11, 2013 - 05:54 PM

I'm with Doug, it sure sounds like a breather issue.  Why do you say it's not? 

 

Do a cylinder leak down test that will probably tell you where the oil is coming from.



#4 superaben OFFLINE  

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Posted January 11, 2013 - 10:13 PM

Thanks gentlemen for your quick responses.

 

My assumption for the piston ring was that the amount of oil in the cylinder head would be hard to produce without a bad oil control ring.  But I've been wrong, and I certainly hope I'm wrong today since rings oversize are hard to come by for this engine.

 

The valve chamber is not excessive, although certainly present. 

 

I will play with the breather and see what happens.

 

Thanks!

 

Ben W.

 

 






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