Today's Message Index:
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1. 02:34 AM - Re: Propeller/engine rotated backwards (jonathanmilbank)
2. 04:19 AM - Re: Re: Propeller/engine rotated backwards (GTH)
3. 05:04 AM - Re: Propeller/engine rotated backwards (jonathanmilbank)
4. 05:38 AM - Re: Propeller/engine rotated backwards (Roger Lee)
Message 1
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| Subject: | Re: Propeller/engine rotated backwards |
As I said "someone's" possibly been doing it and it wasn't me. Regarding sprag
clutches, if my propeller gets turned even slightly the wrong way then it can
clearly be heard and felt that the starter motor is being driven backwards through
the sprag clutch. There is an extra resistance to turning the propeller and
a whirring sound.
Having already had the sprag clutch replaced when changing from the old style starter
to the longer-bodied starter motor, I've seen and understand what's involved
in that job. I removed and replaced the engine myself and don't wish to
repeat that anytime soon!
So going back to my main concern, I'm keen to know if running the engine will get
rid of air in the tappets, in which case that's already happened, or is bleeding
the oil system the ONLY way to achieve this?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474462#474462
Message 2
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| Subject: | Re: Propeller/engine rotated backwards |
/Le 06/11/2017 11:34, jonathanmilbank a crit :
/
> /So going back to my main concern, I'm keen to know if running the
> engine will get rid of air in the tappets, in which case that's
> already happened, or is bleeding the oil system the ONLY way to
> achieve this?/
Jonathan,
Let's say it is the only way to achieve peace of mind ;-)
SI-912-018
<https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si912018_914020.pdf>is
really no big deal, if it were my airplane I'd perform it and clearly
label my prop with a "never rotate backwards" sign.
And why not craft a prop cover with something preventing rotation of the
prop -unless some harm to the engine is deliberately meant ?
FWIW
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 3
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| Subject: | Re: Propeller/engine rotated backwards |
Gilles, you've hit the nail on the head with "unless some harm to the engine is
deliberately meant ?", but when a friend went flying in my aircraft after it
had not flown for 4 weeks, he later told me that it started perfectly first time
with no unusual noises. I only spoke to him after I started this topic, when
I had also flown the aircraft and thought the engine was less smooth.
I have done SI-912-018 a couple of times previously, so I'll probably take your
advice and do it again. However it would be useful to know from someone who has
experienced it before, whether the engine makes noises caused by hydraulic
tappets with air trapped inside. I imagine it would sound a bit like an old diesel
engine, only quieter.
Perhaps I'm just being too suspicious of someone who is known to have done underhand
things before, but not as serious as this!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474469#474469
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| Subject: | Re: Propeller/engine rotated backwards |
If you can actually hear the tappets because you have that much air in the system
you are going to damage and bend things. These are hydraulic lifters and need
oil to function properly.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=474470#474470
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