 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
dwwilt
Joined: 06 Dec 2010
Posts: 192
|
 Posted: Tue Mar 06, 2012 5:44 am Post subject: While Checking the Magnetos, intermittent shutdown |
 |
|
Arion Lightning S/N 132. Stock Jabiru 3300 with hydraulic lifters.
This morning I was going to go fly when during run up, as I was taking the switch from left to both, the engine "burped". I'll call it a burp, but it really was in process of shutting down. I checked left mag again and the engine quit, back to both and since the prop had not stopped, it came back up. I checked several times and the left mag position was intermittent. It would be ok and then it would shut down.
After getting back to the hangar, I pulled the cowl and did not see anything unusual. I checked the wire from the magneto to the distributor cap and it seemed to be on Ok, although looser than the right magneto wire. I'll go see if my playing with the magneto wire did anything positive later this afternoon or tomorrow morning.
My flying window had closed for the morning, so I came home and decided to send out this post. Any ideas? Could it be the ignition switch?
Thanks for any ideas out there.
| | - The Matronics JabiruEngine-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?JabiruEngine-List |
|
_________________
Dennis |
|
| Back to top |
|
 |
pete(at)usjabiru.com
Guest
|
| Posted: Thu Mar 15, 2012 4:50 am Post subject: While Checking the Magnetos, intermittent shutdown |
|
|
The diode is installed between the solenoid activation terminal (where the
wire comes from the switch) and ground.
Pete
--
| | - The Matronics JabiruEngine-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?JabiruEngine-List |
|
|
|
| Back to top |
|
|
BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
|
| Posted: Fri Mar 16, 2012 5:33 am Post subject: While Checking the Magnetos, intermittent shutdown |
|
|
Dan:
The cost of the diode is about $0.33, even Radio Shack has them.
What the diode is known as is "An anti-bounce diode".
What it does is:
When the relay is opened a REVERSE voltage (Reverse EMF) is induced into the relays coil as the magnetic field collapses.
This collapse causes the relay to stay energized for a slightly longer time. No big deal your A&P may say?!?!
But when the relay coil looses this reverse voltage SLOWLY - The BREAKING of the contacts also happens SLOWLY which allows an ELECTRICAL ARC to form on the contact points of the contractor.
After a while, when this happens enough tow things happen:
1 - The contact points get BURNED AWAY and
2 - A CARBON BUILD-UP
This cause the O! S#!+ syndrome; when you can not Power Up or START your plane.
BOTH the Master & Starter Relay should have this (a) diode... OOoooo The price just went up! It is now $0.66.
The diode is installed in REVERSE polarity to the relay coil and ground.
Barry
On Thu, Mar 15, 2012 at 3:34 AM, dwwilt <dwwilt(at)aol.com (dwwilt(at)aol.com)> wrote:
[quote]--> JabiruEngine-List message posted by: "dwwilt" <dwwilt(at)aol.com (dwwilt(at)aol.com)>
I never found the reason for the failure. After checking everything out and ohming the system, the plane started fine and the mag check was fine. Unnerving to me, because there has to be a reason for the problem. I ordered a new switch and replaced it. I opened up the old switch and did not find anything unusual. However, with the Jabiru starter solenoid, the connections are not similar to those on other starter solenoids I am familiar with. I have not found where the surge protection diode was installed originally and I believe it was not installed. I did not do this part of the wiring on my plane. So, my question is, how do you connect the surge protection diode?
--------
Dennis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=368570#368570
===========
-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
| | - The Matronics JabiruEngine-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?JabiruEngine-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
