How to remove the spanner nut 45 hp Mercury lower unit

nmesllc

Cadet
Joined
Aug 3, 2008
Messages
8
I need to replace the lower unit shaft oil seals but the spanner nut seems to be unwilling. Since it is plastic, worried about ruining the nut....any suggestions or idea on how to remove it. I don't have a spanner tool.
Thanks, Larry
 

sutor623

Rear Admiral
Joined
May 23, 2011
Messages
4,087
Re: How to remove the spanner nut 45 hp Mercury lower unit

Well you probably need to make or buy a spanner tool. Not worth cracking the gear case. We had to drill out a spanner nut one day but we got it out. It will be hard to get the new one in regardless, because it needs to be torqed down to spec. I've seen people using a hmer and screwdriver to spin the old nut off and new nut on, but I wouldn't try it.
 
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