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Most if not all numbering systems in industry use the
system where the number cast into a raw foundry part is not the same as what is
called the "detail" part number.
The latter number is what the part is called in a parts
list or when the assembly is used to build a part of a product.
Typically, the detail part number (the one in your parts
book) will be about 2 or 3 numbers above the casting number (depending on how
many drawings are needed to describe the procedure for machining and finishing
the part.)
Part numbers are really drawing numbers - the first in the
sequence shows the raw casting, the next shows the part dimensions required
AFTER final machining, and the 3rd in the sequence shows the parameters needed
to inspect the final part after any finishing (like plating, painting, screw
hole threading etc.) work is done.
This situation is true of all automotive parts number
systems that I am aware of, and also in most of industry in general.
The number that is cast into a cast part is the casting number, NOT the
final part number. A number that is stamped into or tagged on a
part IS the final part number, the one which you will find in your parts
book.
If you can read a CAST IN number of 1686485 on a part, the
part number call out will probably be 1686488 or 1686489 in the parts
book. Part call outs ending in even numbers are for the right side of the
car, odd numbers for the left side, (usually!).
Dick Benjamin (who in an earlier incarnation was a design
engineer [in another industry] and supervised part number issuance
procedure).
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