Mercury Outboard Lower Unit part #'s. One part # is 1643-9539A5 and the other

  • Thread starter Thread starter jims
  • Start date Start date
J

jims

Guest
They should. A is a superseding indicator. The A5 # tells me that gearcase will work on any motor, ser# 0D279349 and below
 
is 1643-9539A3. Are they same? What is the difference between the A5 and the A3? will they interchange motors?
 
The part number are for assemblies. The gear cases are most probably the same but the gear ratio or some other component is slightly different. or simple a newer assembly. I guess that you have one that's broken, and a second one you want to use to replace it. Give us the engine model and sr. and we can try to check if it's the same HP and which gears are in that drive.
 
The part number are for assemblies. The gear cases are most probably the same but the gear ratio or some other component is slightly different. or simple a newer assembly. I guess that you have one that's broken, and a second one you want to use to replace it. Give us the engine model and sr. and we can try to check if it's the same HP and which gears are in that drive.
 
The part number are for assemblies. The gear cases are most probably the same but the gear ratio or some other component is slightly different. or simple a newer assembly. I guess that you have one that's broken, and a second one you want to use to replace it. Give us the engine model and sr. and we can try to check if it's the same HP and which gears are in that drive.
 
Back
Top