Prop Nut Torque 1978 Mercury 90hp Inline 6

kmk89

Seaman
Joined
Jan 30, 2009
Messages
55
Does anyone know the correct torque for the prop nut on a 1978 90hp Mercury inline 6? My engine is the 900 series from '78. Also wondering what the shop manual is for engine. I think most shop manuals have a "part number" or something so you can look them up. I can't seem to have any luck finding the one for this engine. I'd like to get a shop manual to look up things like this.
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
40,583
Does anyone know the correct torque for the prop nut on a 1978 90hp Mercury inline 6? My engine is the 900 series from '78. Also wondering what the shop manual is for engine. I think most shop manuals have a "part number" or something so you can look them up. I can't seem to have any luck finding the one for this engine. I'd like to get a shop manual to look up things like this.

I just set my elbow and tighten but the manual says 55 ft lb.
http://boatinfo.no/lib/mercury/manuals/mercury_1965-1989_40-115.html#/450
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,544
+1............................ Idea is tight with no slack, but don't strip the threads out.....55 it is per the manual!
 
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