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Direction of Rotation?

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rex
Member
Username: rex

Post Number: 6
Registered: 03-2010
Posted on Wednesday, June 01, 2011 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

If a marine engine data plate indicates left hand rotation, does the output shaft rotate clockwise or counterclockwise viewed from the back of the engine?
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jim_parrott
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Username: jim_parrott

Post Number: 15
Registered: 06-2009
Posted on Thursday, June 02, 2011 - 06:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Counterclockwise.
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rex
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Username: rex

Post Number: 7
Registered: 03-2010
Posted on Thursday, June 02, 2011 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Jim.
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richardday
Senior Member
Username: richardday

Post Number: 957
Registered: 11-2003


Posted on Friday, June 03, 2011 - 06:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I think if the maker indicates the engine turns clockwise facing the flywheel the output shaft turns anti clockwise. The old time watermen considered their engines left handed if when one faces the flywheel it turned anti clockwise and the prop would be right handed. It follows if the flywheel turns clockwise the engine is right handed and takes a left handed prop.
I expect it won't be too long before our children will even understand clockwise and counter clockwise.
The above assumes there is no reduction gear which changes the output shaft rotation.
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rex
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Username: rex

Post Number: 8
Registered: 03-2010
Posted on Friday, June 03, 2011 - 07:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The question concerns the direction of rotation of a Sterling Dolphin being correct for a standard truck transmission. Do all automotive drivelines spin the same direction?
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richardday
Senior Member
Username: richardday

Post Number: 958
Registered: 11-2003


Posted on Friday, June 03, 2011 - 08:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have not a clue if ALL automotive drive lines spin in the same direction. Sorry.
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drrot
Senior Member
Username: drrot

Post Number: 89
Registered: 09-2008


Posted on Saturday, June 04, 2011 - 07:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Most automotive applications turn clockwise viewed from the front. This is why several automotive engines ended having the flywheel facing forward in marine applications. It was easier to turn the engine around than make all the parts needed to change rotation. Object being to be able to use a clockwise (right) propeller.
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richardday
Senior Member
Username: richardday

Post Number: 959
Registered: 11-2003


Posted on Saturday, June 04, 2011 - 12:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Palmer typical practice on automotive engine conversion was to put the flywheel on what would be transmission end in a vehicle application. This gave them a left handed engine as standard for single screw boats. The Starboard engine would be marked and the flywheel would on the radiator end of the engine with a right hand rotation to drive a left handed prop without the need for a reduction gear conversion for twin screw applications.
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jim_parrott
Member
Username: jim_parrott

Post Number: 16
Registered: 06-2009
Posted on Saturday, June 04, 2011 - 03:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Rex,
If the engine in question is free you should be able to verify the direction of rotation by turning over, watching the valve train, and direction of output shaft. Proper rotation intake valve will be opening from top of down stroke of piston and exaust valve will be opening from bottom up stroke. If your engine output shaft is turning counterclockwise a standard truck transmission should work. Transmission rotation can be verified turning by hand and shifting gears. I hope this helps.
Jim
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rex
Member
Username: rex

Post Number: 9
Registered: 03-2010
Posted on Saturday, June 04, 2011 - 03:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

It would, but the valve train is 9 hours away. Request for high res. pics of the data plate hasn't happened yet.
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ned L
Visitor
Posted on Thursday, July 28, 2011 - 05:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

(not to be off topic, but) the advantage of a flywheel forward engine in a boat wasn't to make the marine conversion 'easier' by not having to reverse the rotation of the engine to use a right hand prop, it was to let the engine sit lower in the boat and closer to the stuffing box.
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gonzo
Member
Username: gonzo

Post Number: 18
Registered: 06-2011
Posted on Thursday, July 28, 2011 - 11:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The rotation of the engine is from the flywheel, whichever way it is positioned.

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