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Don't know where to turn!

 
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lgold(at)quantum-associat
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PostPosted: Fri Mar 16, 2007 2:57 pm    Post subject: Don't know where to turn! Reply with quote

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

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

regards,

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

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
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PostPosted: Fri Mar 16, 2007 3:44 pm    Post subject: Don't know where to turn! Reply with quote

counterclockwise looking at the PTO shaft

Bob Spudis


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dcsfoto



Joined: 24 Aug 2006
Posts: 120

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

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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