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CH18S Valve seals

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I have a problem with oil fouling on the right hand side of a Kohler CH18S on my Sovereign. Does anyone know for sure if the valve seal can be replaced without removing the cylinder head? I thought about putting the piston on TDC and blowing air into the cylinder to hold the valve closed like we used to do on the older V8 engines in cars and trucks. I would appreciate any and all comments/suggestions. Thanks

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