Posted by Blue_Tractor_Man on November 05, 2018 at 19:08:07 from (174.236.134.57):
I'm getting an old Kohler generator running after it had set up for 20 plus years. There is no visible wear on the cylinders, no ridge, grooves, scratches or anything. It has cast iron pistons. The intake valves and cast iron seats look to be in extremely good condition. However, the exhaust valves that ride on hardened inserts have a wear ring on them where they contact the seat. The hardened seats look rounded a little, but otherwise good. The exhaust valves have rotators, but the intake valves do not. One exhaust valve looks like it was cut by exhaust gasses. This is a low compression 1800 RPM engine. What might be the explanation for what seems to be a strange wear pattern? I do not think it has been run since unleaded gas became common. I plan on getting new exhaust valves and buying a valve seat cutter to refresh the valve seats. I have never done that before, but I am buying a kit, have been watching Youtube videos, and have a factory service manual. Thanks for any advice.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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