Today's Message Index:
----------------------
1. 10:32 AM - Re: Re: 912 with low RPM--- new vibration problem (Les Goldner)
2. 11:31 AM - AW: Re: 912 with low RPM--- new vibration problem (Thilo Kind)
3. 09:26 PM - Re: Re: 912 with low RPM--- new vibration problem (Les Goldner)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 912 with low RPM--- new vibration problem |
Roger, Guy, Bob, and William.
I phones Lockwood and the tech there told me that on new engines they have
seen this vibration when the idle jet gets clogged from installation crud.
So I immediately drove the 50 miles to the Petaluma Airport and cleaned all
the jets... There wasn't any dirt in them (although there were a few specs
in the bowl) and this did not stop the vibration. I also checked the
cylinder pressures (all running 1790-180#)... so I'm back to square one!
To answer your question, there is only a normal (100RPM) drop when doing mag
checks.
I still can't believe the prop is out of balance since it only has 20 hours
on it, was fine up to Saturday, and Warpdrive says they have not seen this
type of problem and I did everything right regarding the adjustment (the
prop tracks within 1/64th of an inch and the pitch of each of the 3-blades
does not vary by more than a 1/5th of a degree). I will call Lockwood again
and may give up and get a local tech to look at the engine... Maybe I'll
sync the carbs again...
Out of ideas,
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Roger Lee
> Sent: Tuesday, March 11, 2008 11:35 AM
> To: rotaxengines-list@matronics.com
> Subject: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> --> <ssadiver1@yahoo.com>
>
> Is your gearbox within the group for recall? Probably not,
> but I had to ask.
> If it were me I would do a dynamic balance. Anything else at
> this point is guessing and chasing your tail. The balance guy
> can probably help you on finding the vibration if it's not
> the prop. Remember the prop blades may weigh very close to
> the same, but all the hardware to fasten it down doesn't.
>
> Do you have a mag rpm drop when you do a mag check?
>
> Check your gearbox magnetic plug and look you debris. If
> something has started to wear badly or chipped inside you
> will start to see it at the plug.
>
> I know this is very frustrating.
>
> --------
> Roger Lee
> Tucson, Az.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=169064#169064
>
>
>
>
>
>
>
> Photoshare, and much much more:
>
>
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 912 with low RPM--- new vibration problem |
Hi Les,
I also had some vibrations on my Zodiac 601 HDS with Rotax 912. Started all
of a sudden. Did the same than you: sync'ed the carbs, checked the ignition,
checked the prop - nothing at all. Turned out, that the choke cable somehow
slipped a tiny little bit and the choke didn't fully close. re-set the choke
cable and - voila - no more vibrations.
Good luck
Thilo
-----Ursprngliche Nachricht-----
Von: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] Im Auftrag von Les
Goldner
Gesendet: Wednesday, March 12, 2008 6:28 PM
An: rotaxengines-list@matronics.com
Betreff: RE: RotaxEngines-List: Re: 912 with low RPM--- new vibration
problem
<lgold@quantum-associates.com>
Roger, Guy, Bob, and William.
I phones Lockwood and the tech there told me that on new engines they have
seen this vibration when the idle jet gets clogged from installation crud.
So I immediately drove the 50 miles to the Petaluma Airport and cleaned all
the jets... There wasn't any dirt in them (although there were a few specs
in the bowl) and this did not stop the vibration. I also checked the
cylinder pressures (all running 1790-180#)... so I'm back to square one!
To answer your question, there is only a normal (100RPM) drop when doing mag
checks.
I still can't believe the prop is out of balance since it only has 20 hours
on it, was fine up to Saturday, and Warpdrive says they have not seen this
type of problem and I did everything right regarding the adjustment (the
prop tracks within 1/64th of an inch and the pitch of each of the 3-blades
does not vary by more than a 1/5th of a degree). I will call Lockwood again
and may give up and get a local tech to look at the engine... Maybe I'll
sync the carbs again...
Out of ideas,
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Roger Lee
> Sent: Tuesday, March 11, 2008 11:35 AM
> To: rotaxengines-list@matronics.com
> Subject: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> --> <ssadiver1@yahoo.com>
>
> Is your gearbox within the group for recall? Probably not,
> but I had to ask.
> If it were me I would do a dynamic balance. Anything else at
> this point is guessing and chasing your tail. The balance guy
> can probably help you on finding the vibration if it's not
> the prop. Remember the prop blades may weigh very close to
> the same, but all the hardware to fasten it down doesn't.
>
> Do you have a mag rpm drop when you do a mag check?
>
> Check your gearbox magnetic plug and look you debris. If
> something has started to wear badly or chipped inside you
> will start to see it at the plug.
>
> I know this is very frustrating.
>
> --------
> Roger Lee
> Tucson, Az.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=169064#169064
>
>
>
>
>
>
>
> Photoshare, and much much more:
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 912 with low RPM--- new vibration problem |
Thanks Thilo,
I'll check the check as soon as I can get time.
Les
> -----Original Message-----
> From: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] On
> Behalf Of Thilo Kind
> Sent: Wednesday, March 12, 2008 11:26 AM
> To: rotaxengines-list@matronics.com
> Subject: AW: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> --> <thilo.kind@gmx.net>
>
> Hi Les,
>
> I also had some vibrations on my Zodiac 601 HDS with Rotax
> 912. Started all of a sudden. Did the same than you: sync'ed
> the carbs, checked the ignition, checked the prop - nothing
> at all. Turned out, that the choke cable somehow slipped a
> tiny little bit and the choke didn't fully close. re-set the
> choke cable and - voila - no more vibrations.
>
> Good luck
>
> Thilo
>
> -----Ursprngliche Nachricht-----
> Von: owner-rotaxengines-list-server@matronics.com
> [mailto:owner-rotaxengines-list-server@matronics.com] Im
> Auftrag von Les Goldner
> Gesendet: Wednesday, March 12, 2008 6:28 PM
> An: rotaxengines-list@matronics.com
> Betreff: RE: RotaxEngines-List: Re: 912 with low RPM--- new
> vibration problem
>
> <lgold@quantum-associates.com>
>
> Roger, Guy, Bob, and William.
>
> I phones Lockwood and the tech there told me that on new
> engines they have seen this vibration when the idle jet gets
> clogged from installation crud.
> So I immediately drove the 50 miles to the Petaluma Airport
> and cleaned all the jets... There wasn't any dirt in them
> (although there were a few specs in the bowl) and this did
> not stop the vibration. I also checked the cylinder pressures
> (all running 1790-180#)... so I'm back to square one!
>
> To answer your question, there is only a normal (100RPM) drop
> when doing mag checks.
>
> I still can't believe the prop is out of balance since it
> only has 20 hours on it, was fine up to Saturday, and
> Warpdrive says they have not seen this type of problem and I
> did everything right regarding the adjustment (the prop
> tracks within 1/64th of an inch and the pitch of each of the
> 3-blades does not vary by more than a 1/5th of a degree). I
> will call Lockwood again and may give up and get a local tech
> to look at the engine... Maybe I'll sync the carbs again...
> Out of ideas,
> Les
>
>
>
> > -----Original Message-----
> > From: owner-rotaxengines-list-server@matronics.com
> > [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
> > Roger Lee
> > Sent: Tuesday, March 11, 2008 11:35 AM
> > To: rotaxengines-list@matronics.com
> > Subject: RotaxEngines-List: Re: 912 with low RPM--- new vibration
> > problem
> >
> > --> <ssadiver1@yahoo.com>
> >
> > Is your gearbox within the group for recall? Probably not,
> but I had
> > to ask.
> > If it were me I would do a dynamic balance. Anything else at this
> > point is guessing and chasing your tail. The balance guy
> can probably
> > help you on finding the vibration if it's not the prop.
> Remember the
> > prop blades may weigh very close to the same, but all the
> hardware to
> > fasten it down doesn't.
> >
> > Do you have a mag rpm drop when you do a mag check?
> >
> > Check your gearbox magnetic plug and look you debris. If
> something has
> > started to wear badly or chipped inside you will start to see it at
> > the plug.
> >
> > I know this is very frustrating.
> >
> > --------
> > Roger Lee
> > Tucson, Az.
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=169064#169064
> >
> >
> >
> >
> >
> >
> >
> > Photoshare, and much much more:
> >
> >
>
>
>
>
>
>
> Photoshare, and much much more:
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|