Posted by Blue_Tractor_Man on January 28, 2019 at 10:42:09 from (75.147.171.225):
I am working on my 1967 Kohler 4 cylinder L600 flathead generator. I am in the process of restoring the valve seats with Neway carbide cutters. This is a Craigs list purchase. I was told that the engine had set up inside their garage for 15 years after being removed from a motor home. I cannot tell for sure, but it seems that the #4 exhaust valve seat insert seems a little softer than the other three. Not scientific, but the material seems to be coming off faster than the other three. There are signs that the engine ran hot, such as a warped head, and the exhaust valves had rings pounded, worn, or eroded on their faces.
This is an 1800 RPM, 6.5/1 compression ratio engine designed for leaded gas.
How can I tell if this is happening? Does it make any difference? Can these valve seat inserts lose hardness? Is the hardness all of the way through the insert, or just the surface?
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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