Using old mercruiser 140 engine in boat that had 3.0L with alpha one gen 2

[Rukus1]

Hello, a local marina closed last summer and was selling things very cheap. I picked up a 2003 Bayliner with a 3.0L mercruiser alpha 1 gen 2 drive. The engine had not been winterized properly and had a cracked block. They sold with it an older mercruiser 140. The whole package with trailer was $500. They said their plan had been to put the 140 in the boat to replace the 3.0L

Will I need to completely dress the 140 with all the components of the 3.0L. Ignition system, exhaust manifold and riser, carb, flywheel and coupler? Can I leave the output end of engine the same (with old flywheel and coupler, but just use new bell housing)? I would still need to swap exhaust manifold too which is fine. I've just been told I won't be able to attach the flywheel and coupler from the newer 3.0L to the older 140.



Thanks in advance.

 

[Bondo]

Ayuh,.... Welcome Aboard,...... Yes, you'll need to swap some of the parts, if yer gonna put in that boat,....

 

[Rukus1]

Great thank you, I'm willing to swap everything, just was told on a few other places the new flywheel and coupler will not bolt onto the old engine. Different rear main seal 1 vs 2 pieces. I just didn't understand how that would effect how the flywheel attaches. I'll rip them both apart and check I guess! Thank you

 

[matt167]

Bolt pattern on the crankshaft is different so the old flywheel won’t bolt to the new engine. One of the aftermarket companies makes parts to fit it together.

 

[Rukus1]

Thanks Matt167. And I'm assuming that is necessary to do. I can't swap everything except the old flywheel and coupler? Drive won't fit in properly?

 

[matt167]

You will use the flywheel from the older motor and a coupler designed to fit the old motor to the newer outdrive. With all the right parts it’ll fit and work

 

[Rukus1]

Thanks Matt

 

[Rukus1]

I'll have to track that coupler down, I wonder what the proper wording would be to search for it

 

[Bondo]

You will use the flywheel from the older motor and a coupler designed to fit the old motor to the newer outdrive. With all the right parts it’ll fit and work

Ayuh,.... I believe, that the older flywheel, should be drilled, 'n tapped for mounting a clutch,.....
So, the newer coupler should bolt onto the older flywheel,....

The older coupler bolts to the crankshaft,.....
The newer coupler bolts to the flywheel,....

 

[Rukus1]

That would be ideal Bondo. I'll check that

 

[Rukus1]

Just went to shop to look, no holes unfortunately

 

[Bondo]

Ayuh,.... A machine shop can fix that for ya,.....

 

[Rukus1]

True enough. Ive got a line on a direct drop in 3.0L, I don't mind spending a bit of money going to sell this boat anyway. Will sell the 140 separately then. Might be easier than trying to find parts to make the conversion