On 10/8, Bill Chambers asked several questions about the grilles and
radiators on E units and the shovel nose Zephyrs. Marshall Thayer
replied the same day.
His answer was basically correct except for the location of the
radiators on the shovel nose units. On the original Zephyrs, the
radiators were located behind the grilles over the front windows and
above the operator's cab. (See BB #13, page 7) The fans were behind the
radiators and the discharge air (hot air) was, most likely, ducted
separately from the engine room to the vent openings in the roof on
either side of the exhaust stacks. To duct the hot radiator air into
the engine room, would have "killed" it. The fans were belt driven off
the engine in those days. Electric fans did not appear on EMD units
until the F-2.
On the 9904 - 9907 cab units with two engines, the front was engine's
radiators were over the cab, like the earlier Zephrys while the rear
engine's radiators were located behind the four roof grilles located on
either side of the rear of the unit. To the best of my knowledge, EMD
never built a multiple engine unit with a common cooling system. They
were always separate. On the "B" units with only one engine, the
radiators were at the rear behind the six grilles located again at the
rear on either side. Because the engine was bigger in the "B" unit,(16
cylinders as opposed to two 12 cylinder engines in the "A" units.) it
required additional cooling and thus, more radiators.
I suspect that 9908, (the last shovel nose) was cooled in exactly the
same manner as all the other early Zephyrs with the radiators above the
cab. The large rectangular grills on both sides of 9908's carbody, were
probably engine air intakes with filtration, judging by their
appearance. The 567 model engine required more air for combustion than
did the 201A model used in all the other shovel nose units. The earlier
shovel nose units may have had some air, coming through the front
grilles, that was ducted around the radiators for engine air intake
since there is no other evidence of engine air intakes on their
carbodies
On later E's and F's, Marshall mentioned the frequent changing of side
grills (louvers). The radiator air intakes on these units were located
behind the grills above the port holes at the top of the carbody sides.
Engine air intake openings and filters were also located in that area,
but additional engine air intakes were located in the middle row of
side panels adjacent to the port holes. Configuration of these were
occasionally revised to meet engine air requirements.
Bill Barber
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