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Cummins Powers This Allis-Chalmers 4WD
When the 305 hp diesel engine in his 1979 Allis-Chalmers 85504-WD tractor blew up last fall, Barry Mosby, replaced it with a 350 hp turbocharged Cummins in-line 6-cylinder diesel truck engine. Mosby bought the 855 cu. in. engine from an engine rebuilding shop and junked the old engine.
"The original 731 cu. in., in-line 6-cylinder engine used about 14 gallons of fuel per hour and ran at 2,750 rpms at high idle which I think caused it to blow up," says Mosby. "A complete new engine from the company would have cost much more than the new Cummins engine. It runs at 2,000 rpm's and uses only 10 gallons of fuel per hour so I can run the tractor until 10 p.m. at night on one tank of fuel where before I could only go until 4 p.m. It also has more lugging power so the tractor doesn't `pull down' like it did with the Allis-Chalmers engine. I'm happy with the way it turned out.,'
The biggest modification was to build from scratch a new bell housing between the engine and the 20-speed high-low range transmission, which Mosby rebuilt. He also installed a hinged door behind the engine and in front of the cab to make it easier to reach the engine's electrical components.

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1990 - Volume #14, Issue #6