Reverse rotating engine

[Nhodges1]

So anyone following this, a question was asked which motor is counter rotating, Now if a trans was put behind the wrong engine, and turning the wrong way could it damage the pump or trans itself

 

[RicardoMarine]

So anyone following this, a question was asked which Engine is counter rotating, Now if a trans was put behind the wrong engine, and turning the wrong way could it damage the pump or trans itself

I would have to say yes, damage would occur.



Twin Engines can be found in several arrangements.

For examples:

Typically the Starboard engine is the REV RH Rotation engine.

Volvo Penta has never used a REV RH Rotation engine. Their I/O stern drives, or their I/B transmissions, offer "opposite of engine rotation" output.

Some I/B transmissions also offer "opposite of engine rotation" output.

If a transmission is "opposite of engine rotation" capable, then both engines can be Std LH Rotation.

V-drives can be found with the Port engine being a REV RH Rotation engine with the Stbd engine being the Std LH Rotation engine.



Keep in mind that engine rotation is always determined by viewing the flywheel end.
A Std LH Rotation engine will turn the flywheel CCW, or left hand.
A REV RH Rotation engine will turn the flywheel CW, or right hand.


.

 

[makomark]

You should be able to ascertain rotation from the serial number plate....

As far as the mismatch goes, it depends on what you have. If its a velvet drive, say setup for a LH input and it goes behind a RH engine, it won't do anything because the pump won't produce any pressure.

 

[diver_dave]

What MM said...

If you spun a VD backwards from its correct set up, I'll suppose the pump gears and housing would be the most upset. I THINK the front bearing is fed pressured oil, even in N; so, it will get high rates of wear also. BUT, I can't imagine this bad scenario would play out for very long??

If, on the other hand, a VD was run in R to get a correctly turning prop, much different issues would surface, if it ran for much time.

 

[makomark]

BUT, I can't imagine this bad scenario would play out for very long??

Me neither!!

If, on the other hand, a VD was run in R to get a correctly turning prop, much different issues would surface, if it ran for much time.

That's a different scenario....and I agree, if it was under full load, it would run for long....