Mercruiser 140 to 3.0 conversion

[Starkrylan]

I’ve got a boat with a mercruiser 140 in it with the older 2 piece main seal with a cracked block. I have a chance to get a newer murcruiser 3.0 with the 1 peice main seal what will I need to do to mount my older coupler on the newer engine? Thanks in advance

 

[alldodge]

Depends on what year the motors are

 

[Bondo]

Ayuh,...... Welcome Aboard,........ If yer talkin' 'bout the ole crankshaft mounted couple, ya gotta replace it with the conversion coupler from Sierra,....

 

[Scott06]

https://www.michiganmotorz.com/base-marine-engine-1967-current-replacement-p-4531.html

this 3.0 engine listing outlines at the bottom the smaller flywheel and coupler you need to work with your combo