Are 73-80 merc 20hp lower unit interchangeable?

astrodude

Cadet
Joined
Aug 14, 2022
Messages
7
Hi guys, I have a 1980 Merc 20HP. Lower unit was water damaged, bearings are rusted like in pic.6DA64A81-70DA-4032-9932-7C725639BEA2.jpeg
I’m thinking to find a complete lower unit and replace the whole because when I took the LU apart, the bearing carrier cover nut was corroded and damaged but it seemed nowhere to find a replacement part.
So should I look for a 80’ motor or any motor between 73-80 would work since I find they share the same parts.
 
Last edited:

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,546
Start looking at parts breakdowns
 
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