In Reply to: Re: Cast Iron Front Mount Distributors???? posted by Tim Daley(MI) on October 22, 2018 at 13:12:56:
I forgot to mention too, just to throw another monkey into the wrench, that in manufacturing, the process usually involves a part drawing for the casting with all the dimensions and info needed to cast the part. Next comes the machining blueprint/drawing with all the machined dimensions drawn and toleranced with any and all other pertinent info like material spec and heat treat. For example, if a part is to be heat treated, standard machining practices are to tap holes + .005" over nominal to compensate for shrinkage at heat treat. Then there will be an assembly drawing comprising all the individual parts that go on it. EACH of these blueprints/drawings will have its own number. So, that being said, there could still yet be another drawing for this part -the machining drawing. Many parts stand alone as is with their machined drawing being the part drawing. An example is p/n 8N-10145,generator tension arm. Since there is no casting, the part is made from standard Cold Rolled Steel flat stock, as defined on the drawing under mat'l spec, the machined finished part is the actual part number. It then becomes part of the generator assembly, p/n 8N-10000, which is not marked on the unit, only listed in MPC's. Often guys see the part number of the front mounting bracket, cast recessed as p/n 8N-10139, and think this is the generator number. It is not. The number is actually only the casting number of the bracket itself. The entire bracket assembly is 8N-10138 ASSEMBLED with all the other parts. Believe it or not, there is a method to this madness. We won't go into final supplier/distributor part numbers and their numbering codes and systems.