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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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