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lgold(at)quantum-associat
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 Posted: Thu Mar 20, 2008 9:56 am Post subject: AW: Re: 912 with low RPM--- new vibration problem-fixed |
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The vibration problem was not due to prop balance. It was a combination of
slightly loose bolts that mount the 912 engine and a slightly off carb sync.
The mechanic told me that the bottom-only mounts will loosen up because the
engine isn't support right. Unless you add mounts on top of the engine these
bolts need serious attention. He suggested changing the four 10mm bolts to
studs and using lock washers, which he said won't loosen.
Les
[quote] --
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jack.kuehn(at)gmail.com
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| Posted: Thu Mar 20, 2008 10:34 am Post subject: AW: Re: 912 with low RPM--- new vibration problem-fixed |
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What airplane is your Rotax in? Sorry, I've lost track!!
Jack
On Thu, Mar 20, 2008 at 11:51 AM, Les Goldner
<lgold(at)quantum-associates.com> wrote:
[quote]
The vibration problem was not due to prop balance. It was a combination of
slightly loose bolts that mount the 912 engine and a slightly off carb sync.
The mechanic told me that the bottom-only mounts will loosen up because the
engine isn't support right. Unless you add mounts on top of the engine these
bolts need serious attention. He suggested changing the four 10mm bolts to
studs and using lock washers, which he said won't loosen.
Les
> --
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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lgold(at)quantum-associat
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| Posted: Thu Mar 20, 2008 2:41 pm Post subject: AW: Re: 912 with low RPM--- new vibration problem-fixed |
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Jack,
The plane is a Zenith CH701 STOL/bush plane with 20 hours on it. I have
attached a picture but don't know if Matronics will post it. Zenith came out
with a better 912 mounting arrangement this year, but I don't want to spend
the bucks and time it would take to install it.
Les
[quote] --
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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jack.kuehn(at)gmail.com
Guest
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| Posted: Thu Mar 20, 2008 3:12 pm Post subject: AW: Re: 912 with low RPM--- new vibration problem-fixed |
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The picture came through fine. Nice Airplane!!!
On Thu, Mar 20, 2008 at 4:38 PM, Les Goldner
<lgold(at)quantum-associates.com> wrote:
[quote] Jack,
The plane is a Zenith CH701 STOL/bush plane with 20 hours on it. I have
attached a picture but don't know if Matronics will post it. Zenith came out
with a better 912 mounting arrangement this year, but I don't want to spend
the bucks and time it would take to install it.
Les
> --
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Mar 20, 2008 8:25 pm Post subject: Re: AW: Re: 912 with low RPM--- new vibration problem-fixed |
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Congratulations Les,
I know that chasing a ghost can be very frustrating to say the least.
Your problem solving will help us all identify issues and where to look when the answer is not obvious.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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