78 Merc 140 lower unit

jakeruppert

Cadet
Joined
Mar 14, 2007
Messages
6
I am waiting for a service manual I ordered, but can anyone tell me if I can change the drive shaft bearing with out disassembling the lower case gearing. If so can I get some instructions?
 

Scaaty

Vice Admiral
Joined
May 31, 2004
Messages
5,180
Re: 78 Merc 140 lower unit

Wait for the manual...(and be prepared).. the whole thing must be pulled apart..no easy fix. Lots of work, all must be pulled, shimming must be correct. Not an amateur job. Need correct tools too. Take it to a pro
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,126
Re: 78 Merc 140 lower unit

Jake, You might like to look around for a used LU. You should be able to get one for <$500. Rebuilding of yours may cost more than that.
 
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