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Mark Ruset · 01-10-2012, 09:06 PM

Well I pulled the heads off today and found a massive amount of carbon build up.Additionally found the intake valve stem seals were leaking causing the carbon. I'm sure no amount of spray or Top Engine cleaner could have saved me from pulling the heads. Thanks to all with their suggestions.Not sure if there is a remedy to keep the carbon from returning.

01-10-2012, 09:06 PM	#14
Mark Ruset Member Join Date: May 2006 Location: Southwest Florida Posts: 263 Likes: 35 Liked 43 Times in 29 Posts	Re: Onan Generator Carbon Knock Well I pulled the heads off today and found a massive amount of carbon build up.Additionally found the intake valve stem seals were leaking causing the carbon. I'm sure no amount of spray or Top Engine cleaner could have saved me from pulling the heads. Thanks to all with their suggestions.Not sure if there is a remedy to keep the carbon from returning. __________________ Mark Ruset 2048 STK