Posted by paulinkansas on April 06, 2012 at 08:51:59 from (68.103.68.211):
It's a 23 horse 2 cylinder air cooled Onan NHC engine in a Deere skid steer. A while back I posted on here about the problem. The engine has 2 separate exhaust headers and 2 mufflers. When running the engine at night, one header gets red hot within 30 seconds and a steady blue flame can be seen in the muffler. I followed advice on here and checked the exhaust valve tappet clearance. I could not get a .004 feeler gauge to slip between the valve stem and the tappet. The proper clearance is .012.
That was the problem. The exhaust valve was not closing when it should. There was an adjusting screw, and I turned it as far as I could before it bottomed out. The clearance was .008 and the engine ran good for a few weeks.
Now I have that problem again. The valve isn't closing all the way and flames are coming out that cylinders exhaust. The adjusting screw for the exhaust valve can not be turned any more. It's the top valve in the picture. The bottom valve is the intake, and you can see where there is room to adjust that valves clearance.
What should I do in order have the proper valve clearance? I thought about grinding off about 1/8" of the valve stem, then I would have some leeway with the adjusting screw to get the proper gap.
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