Mercruiser LH vs RH

[105mich]

So if I am replacing a LH engine with a RH engine...do I need to change lower units as well because it was a LH?

 

[Bondo]

Ayuh,..... Welcome Aboard,..... Whatcha workin' on,..?? What drive,..??

Why would ya be usin' a RH motor,..?? they've been obsolete since the '70s,....

 

[105mich]

Oh i see where I was confused, the lower unit controls rotation then?

 

[Bt Doctur]

There never was a "right hand engine" used in a outdrive application. Engine rotation is viewed from the flywheel left hand, CCW
that would be clockwise looking at the front of the motor

 

[105mich]

Gotcha, thanks

 

[JoLin]

Oh i see where I was confused, the lower unit controls rotation then?

Yes. I have counter-rotating drives on my boat. Engines are the same and both rotate counter-clockwise (viewed from the flywheel looking forward). The drives make the difference.

 

[Bt Doctur]

And when removing the drive the standard one RH prop goes in fwd. the counter rotating drive LH prop goes in rev