Re: 1929 640 Water pump/fan hub pulley
Posted by Owen_Dyneto On 2014/1/10 11:58:43
The "small" engine (626, 633) has a 3-3/16 bore for 320 cubic inches. The "large" engine (640, 645) has a 3-1/2 bore for 385 cubic inches. Both have a 5 inch stroke. This continued thru 1936 when the smaller engine was the "Eight" (sometimes incorrectly called the Standard Eight) and the larger engine the "Super Eight".
When the 6-cylinder engine was dropped, the small eight was substituted into a space formerly occupied by the 6; the space was restricted for the waterpump and thus the change to the sidemounted pump for the smaller 8-cylinder engine. This was a 1-year feature. See picture. On those few early models w/o the sidemounted pump and not retrofitted, it was necessary to tip the radiator forward to get enough clearance to service the pump, not a trivial job.
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When the 6-cylinder engine was dropped, the small eight was substituted into a space formerly occupied by the 6; the space was restricted for the waterpump and thus the change to the sidemounted pump for the smaller 8-cylinder engine. This was a 1-year feature. See picture. On those few early models w/o the sidemounted pump and not retrofitted, it was necessary to tip the radiator forward to get enough clearance to service the pump, not a trivial job.
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