Posted by Blue_Tractor_Man on December 04, 2018 at 07:44:26 from (75.147.171.225):
I need some wisdom on valve guides, please. I am still working on my Kohler L600 generator engine. It is an inline 4 cylinder flathead. When I got it, it had been sitting up in a garage for maybe 15 years. A couple of valves were stuck in the up position. I got all of them freed up and out. The 4 exhaust valves were eroded/pounded around the face where they seat, so I am replacing them. One of the intake valves was rusted, so I replaced it. I bought a Neway valve seat tool set to cut the 45 degree and 15 degree. The Neway set came with a guide for the tool, and it is .311 at the top of the taper. It is supposed to snug down into the valve guides. It only snugged into one guide, so I bought a .001 oversized tool, .312 at the top, and it snugged down into the rest of the guides. So, I think my guides are between .311 and .312, which is what the manual calls for when new. The manual does not give a maximum size before replacement is needed. The intake valve stems are .310 and the exhaust valves are .308. Reading on the internet, it seems that clearance for intake valves should be .001-.002, and exhaust valves should be .002-.004. If those numbers are correct, then my clearance is fine.
But, when I drop the valves into the guides, they sure feel loose. I have nearly zero experience with valve guides, so maybe I don't know what I am looking at.
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