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Don't know where to turn!

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lgold(at)quantum-associat
Guest

Posted: Fri Mar 16, 2007 2:57 pm Post subject: Don't know where to turn!

I need to turn the shaft of a new 912 ULS engine to put some oil in the  cylinders (it has been  sitting in its original box for  over 2-years) and can't figure out which way to turn it.  Sounds like a really stupid question that could be easily answered by reading  the Rotax manuals… but:  

The 912  Operators Manual says “Propeller shouldn’t be turned reverse the normal  direction of engine rotation” and goes on to say (Page 8-2) that “Direction  of rotation of propeller shaft is counter-clockwise looking at p.t.o. side of  engine.” Sounds easy enough until you also read page 19 in the 912ULS  Installation Manual, which contradicts this by saying “crank the engine by  hand on attachment screws of flywheel two complete turns anticlockwise (viewed  from Magneto side).” 

Since you can’t turn the shaft both  anticlockwise from the p.t.o. side while turning it counterclockwise from the  mag side I don’t know which way to turn the shaft. Can someone clarify this by  telling me, looking from the front of the engine (from p.t.o. side toward mag  side), which way the engine is supposed to turn? 

Thanks for the help, 

Les 

PS:   I expect to begin the 912 installation in  about 3-months in a Zenith CH701. 

   [quote][b]

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mikenjulie.parkin(at)btop
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Posted: Fri Mar 16, 2007 3:08 pm Post subject: Don't know where to turn!

The Rotax rotates anticlockwise viewing from the  front. The prop end!!

  

 regards,

  

 MP

 [quote]   ---

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Gilles.Thesee(at)ac-greno
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Posted: Fri Mar 16, 2007 3:18 pm Post subject: Don't know where to turn!

Les Goldner a écrit :

 	  Quote: 	
		  

 Sounds like a really stupid question that could be easily answered by 

 reading the Rotax manuals… but:



 The 912 Operators Manual says “Propeller shouldn’t be turned reverse 

 the normal direction of engine rotation” and goes on to say (Page 8-2) 

 that “_Direction of rotation of propeller shaft is counter-clockwise 

 looking at p.t.o. side of engine_.” Sounds easy enough until you also 

 read page 19 in the 912ULS Installation Manual, which contradicts this 

 by saying “_crank the engine by hand on attachment screws of flywheel 

 two complete turns anticlockwise (viewed from Magneto side)_.”



 Since you can’t turn the shaft both anticlockwise from the p.t.o. side 

 while turning it counterclockwise from the mag side I don’t know which 

 way to turn the shaft. Can someone clarify this by telling me, looking 

 from the front of the engine (from p.t.o. side toward mag side), which 

 way the engine is supposed to turn?



Les,
	




There is nothing wrong with the manuals. The Rotax engine has a spur 

reduction gear : http://contrails.free.fr/engine_rotax_reduct_en.php

So whereas the props turns in one direction, the CRANKSHAFT turns the 

other way.

At the front you turn the prop, and at the rear what you turn is the 

flywheel attached to the crankshaft.

Do as the manuals say, and everything will be OK.



Best regards,

Gilles

http://contrails.free.fr

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nyterminat(at)aol.com
Guest

Posted: Fri Mar 16, 2007 3:44 pm Post subject: Don't know where to turn!

counterclockwise looking at the PTO shaft

    

   Bob Spudis

    

  

 --

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dcsfoto

Joined: 24 Aug 2006
Posts: 120

Posted: Thu Mar 22, 2007 1:54 pm Post subject: Re: Don't know where to turn!

if you rotate backwards when it is installed on the airplane it will suck oul out of the tank and into the crankcase.

call Lockwood if needed

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