I drained the fuel tank sump, decent. I drained the fuel filter bowl, water. I pulled the filter out, bottom cork gasket swelled up (water?). Cleaned it up and turned on the tank valve. Minutes later, no diesel at the top bleeder on the filter cap. I disconnected the fuel line at the tank valve and had a minute dribble. I rapped on the valve with a 3/4" wrench a few times and diesel flowed... Not good. Hooked the line back up and glow plugged the engine for about 2 minutes to make SURE it was hot. Fired off quick, but knocked a little. Let it idle about 5-8 minutes and wile knocking I eased the throttle up a little at a time. Lo and behold, after about 1/2 throttle it stopped. I progressed to WOT and no knock? Sharply went to idle and knocking began, back to WOT and smooth (some light missing, but been that way for years).
I got the tractor 3-4 years ago and it had a light miss under load. I used about 3x recommended doseage of (Diesel Kleen?) injector cleaner and cetane booster for several tanks. It ran like a top. I stopped using it about a year ago and have long since ran several tanks of hwy diesel thru it.
Once I got it back to the shop, I could see the exhaust smoke. It was grayish-black when it would miss and a lot of it. So missing only below 1/2 throttle and grayish-black... Could it be an injector not seating or stuck flooding a cylinder at part-throttle and using all the fuel at WOT?
I have been mowing (bush hog) a lot lately at about 1/2-3/4 throttle, not WOT. When I gap down on it after it is warmed up occasionaly I'll see some sparks come out of the exhaust. I have heard these engines like to be loaded and not babied around. I have provided a lot of easy, low RPM work on it. Could it be carbon build up and I need to dump some Diesel Kleen to it and run the Sh*t out of it?
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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