alphaa211 Show full post »
alphaa211
What are the valve guides made out of?  At 45 hours when I changed the oil I found "Some shiny aluminum particulates & a few tiny brass or bronze pieces visible in bottom of drained oil."        
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Cobranut
I regularly get around 1% leakdown numbers on my race motors, even after a season of racing, so 2% is very believable to me.
I always do my test at 100psi, so you may see just a bit lower leak rate at the lower pressure.
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alphaa211
Generac tech (super, super nice guy) called Generac technical support while on site.  They advised the compression numbers were not what they were looking for, the leak down test was what they were interested in, the leak down test did not indicate an issue, and 10ml per hour oil consumption equals a "very healthy engine."  No answer for the oil on the front piston face.  They advised they would not do anything warranty-wise on oil consumption until it used "1 quart in 10 run hours."  I was thinking that's a tad bit extreme.  Tech did say that in his experience, Generac was very responsive with warranty work and his company had been installing lots of generators.

I'm thinking maybe a bad valve stem seal &/or guide or an issue with the oil control rings carbon crusted or failed to seat.  I noticed replacing both complete cylinder head assemblies is about $350ish for all the parts and gaskets.  Might start with a $3 stem seal to begin with! 
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