Quote:
Originally Posted by Charles Brock
What is the difference between a 78-10130 and a 81A-10130 Generator Pulley? Thanks
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The difference between 78- and 81A- is very subtle. Both were used in 38-39 (maybe as early as 37). As already mentioned, the shaft diameter is the same (the "large" late model shaft diameter) with the same means of retention (Woodruff key, etc.). The difference is they mate with different front plates. The 81A mates with a 79-10139 front plate (for the small diameter, three-brush generator case). The 78 pulley mates with the the 78-10139 front plate (for the large diameter, two-brush case). You have to look very carefully at the Ford drawings of these pulleys to see the actual dimensional differences. During 37-39, there were several different fan-mount generator assemblies used - some oddball assemblies were low production versions used on a trial basis.