A gravity feed fuel system operates at low pressure. Moderate restriction caused by a fuel filter can reduce the fuel pressure to a dangerous level and cause a lean the air/fuel mixture. The air/fuel mixture needed for combustion may not be enough to keep the combustion chambers cool while operating under load. If an engine is running so lean that the piston and chamber have heated up more than tolerances will allow, the piston may grind against the cylinder wall until it freezes. Excessive heat can burn a valve or melt a hole in the piston.
It would be interesting to find out if melted pistons are a common failure in IH engines?
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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