1987 MerCruiser 3.0 Flywheel size

[GeauxJoeAllen]

Is there a way to tell the flywheel size without removing the motor? 12 3/4" or 14"
I am going of doing an engine swap after cracking my 3.0 block. I don't want to pull the motor until I have its replacement.
Thank you in advanced!
Joe

 

[alldodge]

The 14 inch flywheel will also use a starter with staggered bolts
The 12 3/4 uses a starter with inline bolts

 

[dubs283]

The 14 inch flywheel will also use a starter with staggered bolts
The 12 3/4 uses a starter with inline bolts

Like this info

12 3/4 is older gen, 14 is newer?

 

[GeauxJoeAllen]

The 14 inch flywheel will also use a starter with staggered bolts
The 12 3/4 uses a starter with inline bolts

I will check that out! Thank you, AllDodge

 

[Scott06]

The 14 inch flywheel will also use a starter with staggered bolts
The 12 3/4 uses a starter with inline bolts

Yes 14” flywheel was part of move to single rear main seals. If the OPs engine is original it will have the smaller flywheel. I think 1990 (engine manufacture year) was cut over date

 

[dubs283]

I think 1990 (engine manufacture year) was cut over date

Good info, thanks