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Old 11-24-2013, 11:13 AM   #4
rotorwrench
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Default Re: 8BA Flathead fan belt widths

The two sizes were different in more than just size in the mechanical make up of the whole drive system. The wide sheave types were used on early 48 & 49 8BA/8CM engines but in late 49 a change was made to all of the cars. Only trucks used them up through 52. Wide sheave belt systems used one belt to drive both pumps & gen so they had the sheaves aligned on the pumps. The other was to drive the fan only kind of like the 59A engines did. The narrow sheave design had one side drive a pump & the gen and the other side drove a pump & the fan. All of the parts have to follow to make it work since none of the sheaves are the same. The fans were different too. The early ones dated back to 1942 in design.

Last edited by rotorwrench; 11-24-2013 at 12:15 PM.
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