Re: Valve seats

Posted by Butch(OH) on July 27, 2018 at 04:30:29 from (66.192.33.38):

In Reply to: Valve seats posted by Bkpigs on July 26, 2018 at 18:36:46:

Sorry no $10 fixes for that. That area gets too hot for any glue to hold the seat in place. Peening doesn't work either other than short term. Heat must transfer to the head to prevent overheating of the seat and peening it causes it to lose contact area, thus it overheats, and expands more than the block, and thus quickly loosens again. The only fix is an oversized seat and the dollars it takes to get it done, sorry. My tooling is K-line and pilots on the guides. Seats are cheap but an oversized seat requires the correct sized cutter and $$. Even at my cheap rates most of those go back home with the owner without being left at the shop. All can be done on a knee mill with a boring head but the set up would be super tedious, a job for a retired machinist with nothing but time on his hands and a Bridgeport in his shop.
The great bulk of the time these days opening up an Onan for any reason leaves a guy with the same feelings you have,, sorry. Parts are ridiculous expensive and add a bit of machine work and you have one large money pit.

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