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 - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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