Today's Message Index:
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1. 02:17 AM - Re: Gearbox with no overload clutch..... (jetboy)
2. 02:46 AM - Re: Re: Gearbox with no overload clutch..... (peter.rees01@tiscali.co.uk)
3. 04:21 AM - Re: 912 carb cable ends (Catz631@aol.com)
4. 04:32 AM - Re: Beware California Power Systems (Catz631@aol.com)
5. 04:36 AM - Re: Rotax 912S Dead or not ? .... (Catz631@aol.com)
6. 05:06 AM - Re: 912 carb cable ends (Catz631@aol.com)
7. 05:50 AM - Re: Gearbox with no overload clutch..... (Thom Riddle)
Message 1
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| Subject: | Re: Gearbox with no overload clutch..... |
There is a preload test for the "dog clutch" which requires locking of the crankshaft
with a pin threaded into a hole on the side of the crankcase nose. Then
prop is pulled with tension scales to determine if the slip torque is within
spec. over the play range of the dog (15 degrees or 30 degrees for the later ones)
I have helped do this test and the clutch was replaced, it is a separate
item from the optional slipper clutch and all 912 boxes should have one, despite
what I'm told by some. If this part has got slack, starting the engine may
become difficult.
Ralph
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=183069#183069
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| Subject: | Re: Gearbox with no overload clutch..... |
I think that this test is titled 'Torsional Vibration Damper' in the
rotax manual. Rotax current recomendation for this parameter is (from
memory) 400 inch pounds. Ours was down to 200 and as Ralph suggested,
we had starting problems (which mullered the Sprag Clutch). The test
is very simple to do - if yours is low, gearbox has to come off and a
shim fitted - cheap to do, expensive not to do!
Peter
----Original Message----
From: sanson.r@xtra.co.nz
Subj: RotaxEngines-List: Re: Gearbox with no overload clutch.....
nz>
There is a preload test for the "dog clutch" which requires locking of
the crankshaft with a pin threaded into a hole on the side of the
crankcase nose. Then prop is pulled with tension scales to determine if
the slip torque is within spec. over the play range of the dog (15
degrees or 30 degrees for the later ones) I have helped do this test
and the clutch was replaced, it is a separate item from the optional
slipper clutch and all 912 boxes should have one, despite what I'm told
by some. If this part has got slack, starting the engine may become
difficult.
Ralph
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=183069#183069
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| Subject: | Re: 912 carb cable ends |
I just replaced my throttle cables in my 912 yesterday. I used cable stock I
purchased from Lockwood when I attended the 912 school in Jan. I bought a
cable cutter and clipped the ends of the cable and housing to proper size slid
thru the "bug nuts' on the carb and the throttles. You could then put shrink
tubing over the cable ends to discourage fraying (or solder,or rubber dip)
That is how I did it on my Kitfox and how it appeared to be done on the
CT's they were flying at Lockwood. When we were doing the carb sync ,I took a
good look at the throttle cable routing. It is rather a pain to get the cable
thru the small holes.Make sure you use a good cable cutter ! Lockwood has real
nice reusable cable end retainers/adjusters for about $4.00 ea. They were far
nicer then the old crimped ends on my 2001 Rotax 912 engine.
I am sure your engine probably uses a different setup (my luck) but that
is how I did mine.
Today I will pneumatically sync the carbs in about 1 minute with my "
throttle bug" and my Twin Max carb sync system. What a nice easy system !
Dick Maddux
Fox4-1200
Rotax 912UL
Pensacola,Fl (starting to get hot ! Yeeechhhh! )
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
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| Subject: | Re: Beware California Power Systems |
Roger,
I had the same kind of service that you had with CPS. I too do not use them
. I have had good service and excellent technical help with Lockwood. LEAF
has been good also.
Dick Maddux
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
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| Subject: | Re: Rotax 912S Dead or not ? .... |
I am glad you went to the Lockwood school and your engine is ok ! I talked
with you about your engine on the phone a few months ago and was wondering about
the results and if you attended school. It is a fantastic course !
Regards,
Dick Maddux
pensacola,Fl
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
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| Subject: | Re: 912 carb cable ends |
Roland,
Here is a picture of a CT carb I snapped at Lockwood showing the linkage.
It has the "super deluxe" adjustable cable ends and shows the threading of the
cable I was talking about.
Dick Maddux
**************Wondering what's for Dinner Tonight? Get new twists on family
favorites at AOL Food.
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)
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| Subject: | Re: Gearbox with no overload clutch..... |
The 912UL gearbox does not normally come with the overload (slipper) clutch but
can be fitted with one. All the 912ULS gearboxes do have this clutch, at least
those sold in recent years. See attached introduction which came from the Rotax
912 Line Maintenance Manual. The procedure is described after this introduction.
In April we did the annual inspection on a Diamond Katana with 912F3 engine. This
is the 80 hp certified engine with constant speed prop and gearbox with the
slipper clutch. We did the friction torque test (slipper clutch equipped gearboxes
only) per the maintenance instructions but used a known weight at the proper
distance from the prop center on a horizontal prop blade to determine if
the slipper clutch was within specs, and it was. You don't need a spring scale
which may or may not be accurate. If you use my method, make sure the prop blade
is close to horizontal. If the first crank lock position does not give you
this keep turning the prop until you find a crank lock position that does give
you close to horizontal. The test is very simple and quick but applies only
to gearboxes with slipper clutches.
Our Allegro has a 912UL engine without the slipper clutch. Rotax states that the
gearbox internal inspection is to be carried out on gearboxes without slipper
clutches at 400 hour intervals. Gearboxes with the slipper clutch are supposed
to be inspected at 600 hour intervals. If yours needs inspection, let me know.
I'm set up to do gearbox inspections and I'm cheaper than Lockwood.
Thom Riddle
Power Plant Mechanic
KBQR
Buffalo, NY
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