Today's Message Index:
----------------------
1. 07:08 AM - Re: RotaxEngines-List Digest: 1 Msgs - 07/30/18 (catz631@aol.com)
2. 09:58 AM - Re: 912 ULS sudden rough running on mag check (FoesFlyDennis)
Message 1
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| Subject: | Re: RotaxEngines-List Digest: 1 Msgs - 07/30/18 |
Dave,
=C2-I was going to guess an internal broken wire before I got to end of y
our post as this has happened to me twice and is a common issue in these en
gines.
Dick Maddux=C2-
=C2-
In a message dated 7/31/2018 1:41:24 AM Central Standard Time, rotaxengines
-list@matronics.com writes:
=C2-
*
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Total Messages Posted Mon 07/30/18: 1
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Today's Message Index:
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1. 07:51 PM - 912 ULS sudden rough running on mag check (Dave)
________________________________ Message 1 ________________________________
_____
Time: 07:51:06 PM PST US
From: Dave <daberti@sbcglobal.net>
Subject: RotaxEngines-List: 912 ULS sudden rough running on mag check
My engine ran fine on a local flight to a neighboring airport last week. Wh
en
leaving, I had some vibration, rough running that is not characteristic to
my
engine. I powered up the boost pump and it seemed a little better so I cont
inued
to taxi. Just prior to the run up area I got a few more shakes so I pulled
off to check under the cowling. I found nothing amiss so I continued to che
cklist
and mag check. My A side ran fine but B dropped 150 or so then ran fine.
I flew the 30 min flight home without incident and arriving at the hanger
did my usual shutdown mag check. The B side shook like crazy and I could no
t
power through the rough running. Heres what I found.
Grounds all normal. Checking the trigger coils resistance all was normal. I
took
the connectors apart and established continuity to the triggers. Checked th
e
coil primary side and one had no resistance, meaning two cylinders got no s
park.
I used a pin and checked the white wire near the coil and got good readings
.
Moved the pin 1 inch past the connector and still good. Now I removed the
pin from the connector and the wire felt limp about 1/8 below the pin at th
e base
of the connector boot. I dissected the wire with an exacto and sure enough
the wire was completely broken.
I was able to repair the connection as the wire was long enough. Put it all
back
together and it purrs like a kitten. It actually may be smoother than it
was on more recent flights so Ill bet it was going for some time and finall
y gave
up the ghost.
Perhaps this will help someone else if they experience similar issues.
Dave Alberti
Message 2
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| Subject: | Re: 912 ULS sudden rough running on mag check |
Dave, Thanks for sharing your experience and trouble shooting methods.
Dennis
On Mon, Jul 30, 2018, 7:55 PM Dave <daberti@sbcglobal.net> wrote:
>
> My engine ran fine on a local flight to a neighboring airport last week.
> When leaving, I had some vibration, rough running that is not
> characteristic to my engine. I powered up the boost pump and it seemed a
> little better so I continued to taxi. Just prior to the run up area I go
t
> a few more shakes so I pulled off to check under the cowling. I found
> nothing amiss so I continued to checklist and mag check. My A side ran
> fine but B dropped 150 or so then ran fine. I flew the 30 min flight hom
e
> without incident and arriving at the hanger did my usual shutdown mag
> check. The B side shook like crazy and I could not power through the rou
gh
> running. Here=99s what I found.
> Grounds all normal. Checking the trigger coils resistance all was normal.
> I took the connectors apart and established continuity to the triggers.
> Checked the coil primary side and one had no resistance, meaning two
> cylinders got no spark. I used a pin and checked the white wire near the
> coil and got good readings. Moved the pin 1 inch past the connector and
> still good. Now I removed the pin from the connector and the wire felt li
mp
> about 1/8=9D below the pin at the base of the connector boot. I dis
sected the
> wire with an exacto and sure enough the wire was completely broken.
> I was able to repair the connection as the wire was long enough. Put it
> all back together and it purrs like a kitten. It actually may be smooth
er
> than it was on more recent flights so I=99ll bet it was going for s
ome time
> and finally gave up the ghost.
> Perhaps this will help someone else if they experience similar issues.
>
> Dave Alberti
>
>
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