1979 Merc 20 hp thunderbolt lower unit leaking fluid

[dc_bass]

My lower unit is leaking gear lub from the prop area, any idea where I can find a drawing to show me how to take it appart and replace the seal or what else the problem might be?

 

[Mi duckdown]

Re: 1979 Merc 20 hp thunderbolt lower unit leaking fluid

Buy OEM Merc service Manual. It will tell everything you need to do.
Pricey, but worth the money.