Harderned valve seats

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Old 12-30-03, 05:47 PM
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Location: Montevallo, Alabama
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Harderned valve seats

I ran into something unusual while cutting valve seats. B&S engine, m - 281707, t - 0412-01, c - 90113031. While using my Neway seat cutter, the intake valve seat was cut O.K....however on the exhaust seat the cutters felt like they were trying to cut glass. The cutter pertty well cleaned the seat up but it would not cut any metal. Could the heat from the exhast valve caused the seat to harden or maybe the seat was hardened wrong when it was installed? The exhaust valve and seat showed no signs of excessive heat. This is the first time I've ever experienced this. Has anyone ever had this to happen?
 
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Old 12-30-03, 11:26 PM
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usually the exhaust valve and seat are hardened, or stellite, to help withstand the heat of the exaust gasses. Especially if the engine was designed to run on propane or natural gas.
 
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