Today's Message Index:
----------------------
1. 05:45 AM - Re: New rocker bushing material - possible issue (Lynn Matteson)
2. 06:36 AM - Re: New rocker bushing material - possible issue (Pete Krotje)
3. 09:22 AM - Re: New rocker bushing material - possible issue (andysilvester)
4. 12:37 PM - Re: New rocker bushing material - possible issue (Lynn Matteson)
5. 01:36 PM - Re: New rocker bushing material - possible issue (andysilvester)
Message 1
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| Subject: | Re: New rocker bushing material - possible issue |
As Newman said to the cops when they showed up at his door...."What
took you so long?" (Seinfeld episode)
I typed the above before I looked at the pictures. After seeing the
pictures, I can only say....What the (bleep)???
I guess this proves that the Australian mice/rats are bigger than the
African mice/rats. :)
Yeah, Andy, my (home-serviced) replacement bushings have been working
just fine for over 800 hours now, in my antiquated external oil feed
and solid-lifter engine. There are times when engineers should just
use what has worked for years and years (plain old metal bushing
material) and NOT try space-age materials that perhaps haven't been
proven in the application.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Sensenich 62"x46" Wood (summer)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying...1065 hrs (since 3-27-2006)
On Nov 3, 2010, at 2:49 PM, andysilvester wrote:
> <andy@cimaer.com.br>
>
> Received from Jabiru recently, this is news that they changed the
> bearing material for the rockers. However, some are reporting
> issues when this new material is used on the 'old' rocker
> lubrication system. Here's it is, for general information and
> awareness (if in doubt, call your Jabiru dealer):
>
> Dear Jabiru Dealers and Maintenance Organisations,
> We have recently introduced a new type of valve rocker bush
> material, as shown in the attached photos. This material has been
> used in South Africa for some time with no problems but we have
> found several cases in Australia where the yellow bush material
> degraded very quickly in service within the first hours of
> operation. All the issues so far have been in hydraulic lifter
> type engines using the old rocker lubrication system i.e.
> hydraulic lifter engines with an external oil feed pipe from the
> crankcase to the cylinder head and solid lifter types.
> Engines where the oil feed for the rockers is carried by hollow
> pushrods are not affected.
> There are no production engines of this configuration so at the
> moment this alert does not affect new production engines.
> If you have fitted any of these type bushes to any engine with an
> external oil feed pipe please have the engine inspected and let us
> know if there are any issues. The inspection can be carried out by
> removing the rocker covers and checking the rockers for slop or for
> any yellow residue. We are also interested to hear if everything
> is fine, so please tell us how many engines you have checked and
> what the inspections found.
> While the investigation is happening these bushes must not be
> fitted to any engine with an external oil feed pipe. If you need
> any of the old type bushes in a hurry in the meantime please let us
> know.
> Thank you,
> Doug Smith
> Engineer, Jabiru Aircraft
>
> The pics attached show the new material (I admit to looking at my
> calendar to see if it was April 1st). I know I'm 'old-school', but
> what's wrong with sintered bronze (oilite) for this job? Swiss
> cheese, anyone?
>
> C'mon Lynn, I bet you have a comment.....!
>
> Cheers, Andy
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=318059#318059
>
>
> Attachments:
>
> http://forums.matronics.com//files/jab_new_rocker_bushing_2_134.jpg
> http://forums.matronics.com//files/jab_new_rocker_bushing_1_637.jpg
>
>
Message 2
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| Subject: | New rocker bushing material - possible issue |
Let me rephrase =93 no one buying a new engine will be getting
rockers fitted with the new material
Pete
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
Richard Girard
Sent: Wednesday, November 03, 2010 4:05 PM
Subject: Re: JabiruEngine-List: New rocker bushing material - possible
issue
..."no one buying a new engine will not be getting rockers fitted with
the new material."
Huh?
Rick Girard
On Wed, Nov 3, 2010 at 2:28 PM, Pete Krotje <pete@usjabiru.com> wrote:
<pete@usjabiru.com>
Let's be clear here - - these rocker bushes have only been retrofitted
to some existing engines and no one buying a new engine will not be
getting rockers fitted with the new material.
Pete
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
andysilvester
Sent: Wednesday, November 03, 2010 1:49 PM
Subject: JabiruEngine-List: New rocker bushing material - possible issue
<andy@cimaer.com.br>
Received from Jabiru recently, this is news that they changed the
bearing material for the rockers. However, some are reporting issues
when this new material is used on the 'old' rocker lubrication system.
Here's it is, for general information and awareness (if in doubt, call
your Jabiru dealer):
Dear Jabiru Dealers and Maintenance Organisations,
We have recently introduced a new type of valve rocker bush material, as
shown in the attached photos. This material has been used in South
Africa for some time with no problems but we have found several cases in
Australia where the yellow bush material degraded very quickly in
service =C3=A2=82=AC=9C within the first hours of operation.
All the issues so far have been in hydraulic lifter type engines using
the old rocker lubrication system =C3=A2=82=AC=9C i.e.
hydraulic lifter engines with an external oil feed pipe from the
crankcase to the cylinder head and solid lifter types.
Engines where the oil feed for the rockers is carried by hollow pushrods
are not affected.
There are no production engines of this configuration so at the moment
this alert does not affect new production engines.
If you have fitted any of these type bushes to any engine with an
external oil feed pipe please have the engine inspected and let us know
if there are any issues. The inspection can be carried out by removing
the rocker covers and checking the rockers for slop or for any yellow
residue. We are also interested to hear if everything is fine, so
please tell us how many engines you have checked and what the
inspections found.
While the investigation is happening these bushes must not be fitted to
any engine with an external oil feed pipe. If you need any of the old
type bushes in a hurry in the meantime please let us know.
Thank you,
Doug Smith
Engineer, Jabiru Aircraft
The pics attached show the new material (I admit to looking at my
calendar to see if it was April 1st). I know I'm 'old-school', but
what's wrong with sintered bronze (oilite) for this job? Swiss cheese,
anyone?
C'mon Lynn, I bet you have a comment.....!
Cheers, Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318059#318059
Attachments:
http://forums.matronics.com//files/jab_new_rocker_bushing_2_134.jpg
<http://forums.matronics.com/files/jab_new_rocker_bushing_2_134.jpg>
http://forums.matronics.com//files/jab_new_rocker_bushing_1_637.jpg
<http://forums.matronics.com/files/jab_new_rocker_bushing_1_637.jpg>
="_blank">www.aeroelectric.com
ooks.com" target="_blank">www.buildersbooks.com
et="_blank">www.homebuilthelp.com
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le, List Admin.
-List"
target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
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Kolb Mk IIIC
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4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be
unable to imagine how we might possibly have gone wrong.
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Message 3
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| Subject: | Re: New rocker bushing material - possible issue |
Thats not what the notice says, Pete, unless Doug at Jabiru has changed his mind
and told you but no-one else.
The notice draws attention to using the new bushing material with externally-fed
rocker lubrication; this seems to be the combination where failures have occurred.
He says There are no production engines of this configuration so at the
moment this alert does not affect new production engines, but since new production
engines are fitted with hollow pushrods, they can (and presumably do) use
the new bushing material. Nowhere does he say that they have withdrawn the new
yellow material from production engines using hollow pushrods.
Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318135#318135
Message 4
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| Subject: | Re: New rocker bushing material - possible issue |
Hey Andy/Pete/others-
Do you suppose the folks over at the Yahoo Jabiru group would be
interested in this topic?
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Sensenich 62"x46" Wood (summer)
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying...1065 hrs (since 3-27-2006)
do not archive
Message 5
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| Subject: | Re: New rocker bushing material - possible issue |
Yes, Lynn, I think the Yahoo Groupers would be interested but to be honest, the
system of linking pictures to text there is cr@p. You have to post the pictures
in a separate files or pictures section and for me, the whole ease-of-communication
and impact for illustrated text is lost.
Also, Pete's made the point adequately that this SHOULD not be an issue that will
affect loads of owners, at least as far as we know from Jabiru now. I posted
it for technical interest purposes, and to get the pics next to the text is
what it's all about. Let's hear it yet again for the Matronics 'web' format.......
Cheers, Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318159#318159
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