| Author |
Message |
    
rex
Member
Username: rex
Post Number: 6
Registered: 03-2010
| | Posted on Wednesday, June 01, 2011 - 07:45 pm: | 
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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? |
jim_parrott
Member
Username: jim_parrott
Post Number: 15
Registered: 06-2009
| | Posted on Thursday, June 02, 2011 - 06:22 am: |
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Counterclockwise. |
rex
Member
Username: rex
Post Number: 7
Registered: 03-2010
| | Posted on Thursday, June 02, 2011 - 07:45 pm: |
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Thanks Jim. |
richardday
Senior Member
Username: richardday
Post Number: 957
Registered: 11-2003
| | Posted on Friday, June 03, 2011 - 06:06 pm: |
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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. |
rex
Member
Username: rex
Post Number: 8
Registered: 03-2010
| | Posted on Friday, June 03, 2011 - 07:23 pm: |
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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? |
richardday
Senior Member
Username: richardday
Post Number: 958
Registered: 11-2003
| | Posted on Friday, June 03, 2011 - 08:33 pm: |
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I have not a clue if ALL automotive drive lines spin in the same direction. Sorry. |
drrot
Senior Member
Username: drrot
Post Number: 89
Registered: 09-2008
| | Posted on Saturday, June 04, 2011 - 07:47 am: |
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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. |
richardday
Senior Member
Username: richardday
Post Number: 959
Registered: 11-2003
| | Posted on Saturday, June 04, 2011 - 12:07 pm: |
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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. |
jim_parrott
Member
Username: jim_parrott
Post Number: 16
Registered: 06-2009
| | Posted on Saturday, June 04, 2011 - 03:00 pm: |
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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 |
rex
Member
Username: rex
Post Number: 9
Registered: 03-2010
| | Posted on Saturday, June 04, 2011 - 03:25 pm: |
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It would, but the valve train is 9 hours away. Request for high res. pics of the data plate hasn't happened yet. |
ned L
Visitor
| | Posted on Thursday, July 28, 2011 - 05:47 pm: |
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(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. |
gonzo
Member
Username: gonzo
Post Number: 18
Registered: 06-2011
| | Posted on Thursday, July 28, 2011 - 11:56 pm: |
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The rotation of the engine is from the flywheel, whichever way it is positioned. |
