Mercruiser 120 swap with another Mercruiser 120 HELP :)

[codes]

Hello good folks at iboats

I have recently aquired a new (for me) late 70's starcraft chiefton. It was powered by a 120 mercruiser engine, which threw a rod on test drive (and resulted in a much cheaper boat!

Luckily for me, I had access to a running 120 mercruiser that is currently sitting in a shop. This is a complete engine that can run on it's own, and I am grateful to have all the spare parts from the old one. Both bolt on to an alpha 1 leg.

My question is this: How much work is there in swapping these two engines out? It seems extremely straight-forward and I am hoping to put it in myself.

I have searched the net to try and find an example of this, but it seems hard to find... is that because it is so easy?

I have not had an I/O before, have had many outboards and have rebuilt 2-strokes before. Just for an idea on my experience.

Many Cheers,

Cody

 

[achris]

Re: Mercruiser 120 swap with another Mercruiser 120 HELP

Cody,

Go to the ADULTS ONLY thread at the top of this forum and you can download the manual for your engine (you'll need to know the year).

Engine swaps in this case (same engine), given that they are roughly the same era, are very straight forward.

Chris.......

 

[bigskiohio]

Re: Mercruiser 120 swap with another Mercruiser 120 HELP

pulling motor out takes 1hr or less and install goes quick, rusty manifolds etc. take time . leave wiring harness on engine and you will only have a few wires to take off . leave the mount on engine and unbolt it from floor. get a new flapper and rear mount washers and check coupler and rubber mounts and fix any wiring while engine is out.

 

[zbnutcase]

Re: Mercruiser 120 swap with another Mercruiser 120 HELP

There are some minor issues with exhaust/riser depending on serial # range, but overall a simple swap. 'nutcase