"Phill"  wrote in message
   om...
  I have recently acquired an old Mercury Comet(Lightning)10hp outboard
  motor. It was completely siezed when I got it, but I stripped it down,
  and with a fair amount of brute force (hammer on piston rods!!) got it
  turning again.  To my surprize, when I put it back together it worked.
   The only thing, I soon found out that the water pump impeller is worn
  out. The serial number of the engine is 9279767, which I am told is
  pre 1950.  I am having problems getting a replacement impeller. Does
  anyone know any mail order companies that could supply one.
The following sites specialize in old Mercury outboards. I will bet you can
find your impeller at one of these businesses.
Bill Grannis
service manager
http://www.vintageoutboard.com/
http://www.oldmercs.com/
http://www.pfs-ware.com/kwast/
antique outboard club  
http://www.aomci.org/aomc.htm