50 HP Merc lower unit swap

M

Mercclunker

Cadet
Joined
Apr 20, 2010
Messages
16
Ok guys.

I have an early 70s model 50 HP merc thunderbolt and was going across the river and all of the sudden my prop stopped spinning and the engine reved up. My mechanic guy says my lower has gone bad, and it isnt worth fixing. I have found a 80s model 50 HP thunderbolt with a good lower and i was wondering if they would swap out. I know its vague, but i am not sure how to look out what year model my motor is.

Please help.
 
achris

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: 50 HP Merc lower unit swap

The lowers should be interchangeable... For the year of your engine, post up your serial number, go to the stick at the top of this forum (What year is my Mercury), or go to THIS website and have a look at the decals and work it out...

Chris.......
 
F

frwhlr38

Seaman
Joined
Aug 4, 2009
Messages
70
Re: 50 HP Merc lower unit swap

What cris is saying is right it should bolt right up BILL
 
M

Mercclunker

Cadet
Joined
Apr 20, 2010
Messages
16
Re: 50 HP Merc lower unit swap

Thanks guys,

I am going to pick it up tomorrow, the only thing wrong with the one im picking up is that the top 2 cylinders are not firing. For 150 bucks i should be able to change this out pretty reasonable.
 
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