Mercruiser transom assembly torquing?

tank1949

Lieutenant Commander
Joined
Apr 4, 2013
Messages
1,911
I am going over (again) two different torque values listed in two service manual downloads. On my Bravo 1s, there are (8) 7/16" studs going through my transom connecting my Mecruiser gimbal housing to its corresponding inner transom plate. I have torqued all (8) corresponding 7/16" fine thread nuts to 23 ft/lbs. But, now I read a second document listing 25 ft/lbs of torque. The initial torquing was performed over two months ago. I am getting ready to install both engines. But, before I do, should I retorque to 25 ft/lbs? Also, the manual(s) is not real clear if I should wait a few days (been over two months) after initial torqueing and retorque? It probably doesn't matter, but I do not want to screw this up. Thx!
 

Fun Times

Moderator
Staff member
Joined
May 16, 2009
Messages
9,241
Depending on where looked mercruiser's transom assembly torque specifications for both Alpha and Bravo torque where generally found to be between 20-25 lb. ft. (27-35 N[SUP].[/SUP]m) with a preferred middle number of 23 lb.ft for typical best suited as they tend to do that on certain types of installations.

In the early years of the manuals seemed to suggest 23 lb then they bumped it up 2 lb after about the year 2000 mark it seems in re-looking over the manuals found (and where / what section looked at) which "maybe" they raised it when they came out with the new design studs.
16-56296--STUD (7/16 X 4-3/4 IN.) (.437-20 x 4.750)
16-818834--STUD (7/16 X 4-1/4 IN.)(.437-20 x 4.250), New Design

The Merc engine installation manual suggests 23 lb. ft.,
https://www.manualslib.com/manual/867373/Mercury-Bravo.html?page=39#manual
http://boatinfo.no/lib/mercruiser/manuals/techsterndrive.html#/12
http://boatinfo.no/lib/mercruiser/manuals/mercruiser11.html#/82
http://boatinfo.no/lib/mercruiser/manuals/mercruiser11.html#/70

Though it shouldn't be needed but If it been sitting after initial installation and you're about to install the engine now, it won't hurt to re-check them at 23 lb. ft. because from judging form your other topic titled Centering transom plate on Bravo 1 gimbal housing? Page: 1 ... from last April, you won't be able to sleep well if you didn't recheck them anyways.::untroubled:
 

tank1949

Lieutenant Commander
Joined
Apr 4, 2013
Messages
1,911
Depending on where looked mercruiser's transom assembly torque specifications for both Alpha and Bravo torque where generally found to be between 20-25 lb. ft. (27-35 N[SUP].[/SUP]m) with a preferred middle number of 23 lb.ft for typical best suited as they tend to do that on certain types of installations.

In the early years of the manuals seemed to suggest 23 lb then they bumped it up 2 lb after about the year 2000 mark it seems in re-looking over the manuals found (and where / what section looked at) which "maybe" they raised it when they came out with the new design studs.
16-56296--STUD (7/16 X 4-3/4 IN.) (.437-20 x 4.750)
16-818834--STUD (7/16 X 4-1/4 IN.)(.437-20 x 4.250), New Design

The Merc engine installation manual suggests 23 lb. ft.,
https://www.manualslib.com/manual/867373/Mercury-Bravo.html?page=39#manual
http://boatinfo.no/lib/mercruiser/manuals/techsterndrive.html#/12
http://boatinfo.no/lib/mercruiser/manuals/mercruiser11.html#/82
http://boatinfo.no/lib/mercruiser/manuals/mercruiser11.html#/70

Though it shouldn't be needed but If it been sitting after initial installation and you're about to install the engine now, it won't hurt to re-check them at 23 lb. ft. because from judging form your other topic titled Centering transom plate on Bravo 1 gimbal housing? Page: 1 ... from last April, you won't be able to sleep well if you didn't recheck them anyways.::untroubled:

When you get my age, you have to recheck everything!!!!!!!! THANKS!
 
Top