Today's Message Index:
----------------------
1. 03:39 AM - Re: Rough running 912 UL (vernon mitchell)
2. 06:31 AM - Re: Rough running 912 UL (Catz631@aol.com)
3. 11:04 AM - Re: Rough running 912 UL (jpfitt)
4. 05:17 PM - Re: Rough running 912 UL (Lowell Fitt)
Message 1
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| Subject: | Re: Rough running 912 UL |
Fantastic you found the problem Hugh. When I do work like that, I always
take a picture. It has helped many times.
Regards,
Vernon.
From: Hugh McKay
Sent: Saturday, September 10, 2016 11:06 PM
Subject: Re: RotaxEngines-List: Rough running 912 UL
Gentlemen (bjones,jelling Catz631 h&, Jeff Wemmelring, Bick Girard,
John Hauck, Lowell Fitt, Dee LeBlanc, GHeal, et al)
Well I found what was causing my rough running engine!! I am some what
embarrassed, but it demonstrates how careful one must be when doing
anything to a Rotax 912 series engine. All this started when I began to
hear excessive engine noise in my head sets when transmitting on my
radio. Well, if you read my earlier questions regarding the engine noise
you will recall that I was advised (good advice)to first check all the
grounds. This I did and found no bad grounds. In the course of checking
the grounds there are two grounding points on the right side of the
ignition modules where two screws screw down into the engine. One of
these ground points has two ground wires attached to it. The other has
three ground wires attached. I removed these grounds, cleaned them and
reattached them to their proper screw location; or I thought I had.
Well, after looking carefully at the top of the engine at these two
ground points and feeling all of the wires in that area I found two
loose black wires with a common ring terminal tucked under the intake
manifold on that side of the engine. Well what a surprise!! Then I began
to think, how can that be?? Then I noticed that these two wires with the
common ring terminal exactly fit one of the two ground points I have
just described. I then realized that I had pushed the end of this double
ground wire with the common ring terminal under the manifold to get
better access to clean the ground point. What I did not remember when it
came time to reattach all the wires was that I had tucked this ground
wire out of sight. I reattached all the =93visible=94 ground wires
forgetting I had tucked one out of sight.
Lesson learned! Make sure you know how many wires you have disconnected,
and reconnect the =93same=94 number. Anyway, I am back flying and the
engine is running fine. Flew down to the big Triple Tree Fly-In just
below Woodruff, SC today with out a problem except the noise in my radio
which is another story. Many thanks for all of your suggestions. I value
them and your willingness to share.
Regards,
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
From: John Hauck
Sent: Thursday, September 08, 2016 6:05 PM
Subject: RE: RotaxEngines-List: Rough running 912 UL
Might be a good time to replace the connectors.=C2 Those have been
rapid wear parts on my three 912s.=C2 They can be bought from
Sparkplugs.com by getting the part number off of a connector.=C2 Price
is a quarter what Rotax wants for them.
john h
mkIII
Burns Junction, Oregon
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of
Richard Girard
Sent: Thursday, September 08, 2016 3:25 PM
Subject: Re: RotaxEngines-List: Rough running 912 UL
Hugh, Old mechanics proverb, "90% of carburetor problems are solved in
the ignition system". That being said, have you checked the resistance
of your spark plug wires? Since you'll have to re-seat the wires anyway,
take the time to trim each end about 1/4" so that the screw connector
has a chance to seat into fresh, un-corroded wire. Also check the screws
themselves for signs of corrosion. Unless the wires are too short
afterward this check won't cost you anything but your time. Almost all
the information you need is available in the Heavy Maintenance Manual
section 74-00-00.
Rick
Message 2
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| Subject: | Re: Rough running 912 UL |
Dashwoodlock,
I too had a similar problem. I pulled up to the airport ,people came out
to look at my plane and the engine wouldn't shut down with the"mag" switch
so I waved taxied out ,took off and flew back to my grass strip . I shut the
fuel off and like you it took forever for the engine to quit. In my case
it turned out that the "p" lead wire had pulled loose from the connector at
the module.
Stuff always happens !
Dick Maddux
912 UL
PS: Hugh ,thank you for your story as it will be filled in the "what to
look for" part of my brain(the little that is left !)
Message 3
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| Subject: | Re: Rough running 912 UL |
Hello, I have watching the conversation about the rough running 912 and noti
ced that a "Lowell Fitt" was listed as part of the contributors. My name is J
ohn Fitt- wondering if we are related, as our name is not that common. We l
ive in northern calif., relations originally from Canada. Just wondering...
John Fitt
707.823.2860
Sent from my iPad
> On Sep 10, 2016, at 2:06 PM, Hugh McKay <hgmckay@bellsouth.net> wrote:
>
> Gentlemen (bjones,jelling Catz631 h&, Jeff Wemmelring, Bick Girard, Joh
n Hauck, Lowell Fitt, Dee LeBlanc, GHeal, et al)
>
> Well I found what was causing my rough running engine!! I am some what emb
arrassed, but it demonstrates how careful one must be when doing anything to
a Rotax 912 series engine. All this started when I began to hear excessive e
ngine noise in my head sets when transmitting on my radio. Well, if you read
my earlier questions regarding the engine noise you will recall that I was a
dvised (good advice)to first check all the grounds. This I did and found no b
ad grounds. In the course of checking the grounds there are two grounding po
ints on the right side of the ignition modules where two screws screw down i
nto the engine. One of these ground points has two ground wires attached to i
t. The other has three ground wires attached. I removed these grounds, clean
ed them and reattached them to their proper screw location; or I thought I h
ad. Well, after looking carefully at the top of the engine at these two grou
nd points and feeling all of the wires in that area I found two loose black w
ires with a common ring terminal tucked under the intake manifold on that si
de of the engine. Well what a surprise!! Then I began to think, how can that
be?? Then I noticed that these two wires with the common ring terminal exac
tly fit one of the two ground points I have just described. I then realized t
hat I had pushed the end of this double ground wire with the common ring ter
minal under the manifold to get better access to clean the ground point. Wha
t I did not remember when it came time to reattach all the wires was that I h
ad tucked this ground wire out of sight. I reattached all the =9Cvisib
le=9D ground wires forgetting I had tucked one out of sight.
>
> Lesson learned! Make sure you know how many wires you have disconnected, a
nd reconnect the =9Csame=9D number. Anyway, I am back flying an
d the engine is running fine. Flew down to the big Triple Tree Fly-In just b
elow Woodruff, SC today with out a problem except the noise in my radio whic
h is another story. Many thanks for all of your suggestions. I value them an
d your willingness to share.
>
> Regards,
> Hugh G. McKay III, P.E. Fellow, L.M. ASCE
> Senior Consultant
> Worldwide Engineering Inc.
> 4090 North NC Hwy. 16
> Denver, NC 28037
>
> Ph. 704-661-8271
> Fax 704-483-5466
> email hgmckay@bellsouth.net
> http://www.wwegeo.com
>
> From: John Hauck
> Sent: Thursday, September 08, 2016 6:05 PM
> To: rotaxengines-list@matronics.com
> Subject: RE: RotaxEngines-List: Rough running 912 UL
>
> Might be a good time to replace the connectors.=C3=82 Those have been rap
id wear parts on my three 912s.=C3=82 They can be bought from Sparkplugs.co
m by getting the part number off of a connector.=C3=82 Price is a quarter w
hat Rotax wants for them.
>
>
> john h
> mkIII
> Burns Junction, Oregon
>
> From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengi
nes-list-server@matronics.com] On Behalf Of Richard Girard
> Sent: Thursday, September 08, 2016 3:25 PM
> To: rotaxengines-list@matronics.com
> Subject: Re: RotaxEngines-List: Rough running 912 UL
>
> Hugh, Old mechanics proverb, "90% of carburetor problems are solved in the
ignition system". That being said, have you checked the resistance of your s
park plug wires? Since you'll have to re-seat the wires anyway, take the tim
e to trim each end about 1/4" so that the screw connector has a chance to se
at into fresh, un-corroded wire. Also check the screws themselves for signs o
f corrosion. Unless the wires are too short afterward this check won't cost y
ou anything but your time. Almost all the information you need is available i
n the Heavy Maintenance Manual section 74-00-00.
>
> Rick
>
>
Message 4
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| Subject: | Re: Rough running 912 UL |
Private email sent
On Sun, Sep 11, 2016 at 11:03 AM, jpfitt <jpfitt@sbcglobal.net> wrote:
> Hello, I have watching the conversation about the rough running 912 and
> noticed that a "Lowell Fitt" was listed as part of the contributors. My
> name is John Fitt- wondering if we are related, as our name is not that
> common. We live in northern calif., relations originally from Canada. Ju
st
> wondering...
>
> John Fitt
> 707.823.2860
>
>
> Sent from my iPad
>
> On Sep 10, 2016, at 2:06 PM, Hugh McKay <hgmckay@bellsouth.net> wrote:
>
> Gentlemen (bjones,jelling Catz631 h&, Jeff Wemmelring, Bick Girard,
> John Hauck, Lowell Fitt, Dee LeBlanc, GHeal, et al)
>
> Well I found what was causing my rough running engine!! I am some what
> embarrassed, but it demonstrates how careful one must be when doing
> anything to a Rotax 912 series engine. All this started when I began to
> hear excessive engine noise in my head sets when transmitting on my radio
.
> Well, if you read my earlier questions regarding the engine noise you wil
l
> recall that I was advised (good advice)to first check all the grounds. Th
is
> I did and found no bad grounds. In the course of checking the grounds the
re
> are two grounding points on the right side of the ignition modules where
> two screws screw down into the engine. One of these ground points has two
> ground wires attached to it. The other has three ground wires attached. I
> removed these grounds, cleaned them and reattached them to their proper
> screw location; or I thought I had. Well, after looking carefully at the
> top of the engine at these two ground points and feeling all of the wires
> in that area I found two loose black wires with a common ring terminal
> tucked under the intake manifold on that side of the engine. Well what a
> surprise!! Then I began to think, how can that be?? Then I noticed that
> these two wires with the common ring terminal exactly fit one of the two
> ground points I have just described. I then realized that I had pushed th
e
> end of this double ground wire with the common ring terminal under the
> manifold to get better access to clean the ground point. What I did not
> remember when it came time to reattach all the wires was that I had tucke
d
> this ground wire out of sight. I reattached all the =9Cvisible
=9D ground wires
> forgetting I had tucked one out of sight.
>
> Lesson learned! Make sure you know how many wires you have disconnected,
> and reconnect the =9Csame=9D number. Anyway, I am back flyin
g and the engine
> is running fine. Flew down to the big Triple Tree Fly-In just below
> Woodruff, SC today with out a problem except the noise in my radio which
is
> another story. Many thanks for all of your suggestions. I value them and
> your willingness to share.
>
> Regards,
> Hugh G. McKay III, P.E. Fellow, L.M. ASCE
> Senior Consultant
> Worldwide Engineering Inc.
> 4090 North NC Hwy. 16
> Denver, NC 28037
>
> Ph. 704-661-8271
> Fax 704-483-5466
> email hgmckay@bellsouth.net
> http://www.wwegeo.com
>
> *From:* John Hauck <jhauck@elmore.rr.com>
> *Sent:* Thursday, September 08, 2016 6:05 PM
> *To:* rotaxengines-list@matronics.com
> *Subject:* RE: RotaxEngines-List: Rough running 912 UL
>
>
> Might be a good time to replace the connectors.=C3=82 Those have been ra
pid
> wear parts on my three 912s.=C3=82 They can be bought from Sparkplugs.co
m by
> getting the part number off of a connector.=C3=82 Price is a quarter wha
t
> Rotax wants for them.
>
>
> john h
>
> mkIII
>
> Burns Junction, Oregon
>
>
> *From:* owner-rotaxengines-list-server@matronics.com [
> mailto:owner-rotaxengines-list-server@matronics.com
> <owner-rotaxengines-list-server@matronics.com>] *On Behalf Of *Richard
> Girard
> *Sent:* Thursday, September 08, 2016 3:25 PM
> *To:* rotaxengines-list@matronics.com
> *Subject:* Re: RotaxEngines-List: Rough running 912 UL
>
>
> Hugh, Old mechanics proverb, "90% of carburetor problems are solved in th
e
> ignition system". That being said, have you checked the resistance of you
r
> spark plug wires? Since you'll have to re-seat the wires anyway, take the
> time to trim each end about 1/4" so that the screw connector has a chance
> to seat into fresh, un-corroded wire. Also check the screws themselves fo
r
> signs of corrosion. Unless the wires are too short afterward this check
> won't cost you anything but your time. Almost all the information you nee
d
> is available in the Heavy Maintenance Manual section 74-00-00.
>
>
> Rick
>
>
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