Cold shrinks metals. His shop manual said to heat it. Heat expands metals. His bearing installed on the shaft must have really close tolerance for fit. Heating the bearing will expand the metals in it just enough to give it more clearance to slide it over the shaft. When it cools it will contract and fit tight on the shaft. Freezing a part works well when installing a close tolerance part into a bore. (Something like dry fit cylinder sleeves into an engine block.)
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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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