Add-On Engine
Back in 1962, Jack McMillan, Pleasant Plains, Ill., needed more horsepower for the Oliver 80 he was using. He got it from a 20 hp air cooled Wisconsin engine, salvaged from a hay baler.
"It made a four 14 tractor out of a three 14," McMillan recalls.
"I was running the tractor about the time farmers started switching to dual wheels. I remember putting duals on the old Oliver and pulling a 12-ft. disk. The extra engine gave me enough to spin the wheels."
Oliver tractors of this vintage had a front mounted cultivator that hung on pipes run through the tractor frame. McMillan made use of these pipe holes to provide for the mounting of his Wisconsin engine.
He installed two pipes for a frame, then made another frame for holding the engine. It was designed so the Wisconsin engine was mounted parallel with the Oliver engine, and so the pulleys of the two engines would line up. This hookup also eliminated the need for hand cranking the Wisconsin engine.

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1981 - Volume #5, Issue #6