Today's Message Index:
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1. 01:24 AM - Re: [jabiruengines] Oil Cooler Failure (James, Clive R)
2. 06:22 AM - Re: Re: [jabiruengines] Oil Cooler Failure (FLYaDIVE)
3. 01:48 PM - Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 (BobbyPaulk@comcast.net)
Message 1
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| Subject: | RE: [jabiruengines] Oil Cooler Failure |
I scanned and uploaded the a doc to the 'files' section of the Yahoo
group, file is called LAA Cooler Safety spot. I'm afraid I don't have
access to a PDF writer at the moment so it's a bit blurred as I cobbled
it together into a word Doc
I understand it was on a 3300 Jabiru, the cooler failed a few minutes
after the first time the aircraft flew with it. The previous cooler
leaked after about 350 hours.
The statement made by 'B' below isn't quite true;
'the outer plates bulge due to poor manufacturing technique', let's be
clear this is what is supposed to have happened in the case of the
single failed cooler that was investigated by the UK AAIB.
Supposition that all Earls coolers are manufactured badly is at best a
little harsh, at worst it is defamatory.
It is my belief bulging Earls coolers are caused by fatigue, fatigue
caused by pressure fluctuations, pressure fluctuations developed in the
Jabiru oil system. I saw a bulging Earls cooler on a 3300 two weeks ago,
about 350 hours, not leaking though.
The numbers are something like: tested to 11 bar, operating at 4.5 bar
so why else should a cooler fail or bulge?
When there is a failure of this sort it is important to get to the root
cause, stopping when you think you have the issue sorted can put you in
a disadvantaged position, or a field.
I believe the root cause of Earls coolers failing on Jabiru engines is
pressure fluctuations.
'B' is right to suggest that anyone who has an Earls cooler should check
it, in fact anyone with an oil cooler should check it as I believe most
Jabiru engines have pressure fluctuations.
Positech coolers seem to be tolerant of the Jabiru oil system, looking
at the website they seem to manufacture industrial coolers for plant
where as Earls seem to be automotive.
Positech coolers are unfortunately not a good shape for many cowlings.
>From what I can gather, Jabiru in Australia use an hydraulic cooler for
a auto transmission, not as efficient in heat transfer but robust from a
pressure perspective.
Regards, Clive
2200 in an SP (#596)
3300 in an Esqual (#1460)
-----Original Message-----
From: jabiruengines@yahoogroups.com
[mailto:jabiruengines@yahoogroups.com] On Behalf Of Brian Anderson
Sent: 14 September 2011 20:48
Subject: Re: [jabiruengines] Oil Cooler Failure
Any chance of scanning the piece for those of us that cannot get the
magazine.
Was it on a Jabiru engine ?
Brian
On 15/09/2011, at 3:31 AM, Barbara Davies wrote:
> The Latest U.K. L.A.A. Magazine (September) shows a failure in an
> Earls
> 41006 type oil cooler. This type of cooler used to be supplied by Jab
> in the U.K., and possibly in other countries. There are
> unsubstantiated rumours of other failures in this type of oil cooler.
> The outer plates bulge due to poor manufacturing technique. This then
> causes the side-wall to fracture, leading to a loss of oil. The
> failure should have shown up if the cooler was tested to 175psi, which
> the manufacturer claims to carry out.
> This type of cooler was replaced with a Positech type which has not
> had reports of failure. Anybody who has an Earls cooler may want to
> look at it carefully, and look for signs of deformation in the top or
bottom plates.
> Cheers,
> B.
>
[Non-text portions of this message have been removed]
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Message 2
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| Subject: | Re: RE: [jabiruengines] Oil Cooler Failure |
WOW!
Can someone post pictures of this oil cooler failure?
I am very interested in seeing the failure and its location.
Also, what material is the cooler made from? Usually it is a brass frame
and channels with aluminum fins between the channels.
Barry
On Thu, Sep 15, 2011 at 4:20 AM, James, Clive R <clive.james@uk.bp.com>wrote:
> clive.james@uk.bp.com>
>
> I scanned and uploaded the a doc to the 'files' section of the Yahoo
> group, file is called LAA Cooler Safety spot. I'm afraid I don't have
> access to a PDF writer at the moment so it's a bit blurred as I cobbled
> it together into a word Doc
>
> I understand it was on a 3300 Jabiru, the cooler failed a few minutes
> after the first time the aircraft flew with it. The previous cooler
> leaked after about 350 hours.
>
> The statement made by 'B' below isn't quite true;
> 'the outer plates bulge due to poor manufacturing technique', let's be
> clear this is what is supposed to have happened in the case of the
> single failed cooler that was investigated by the UK AAIB.
>
> Supposition that all Earls coolers are manufactured badly is at best a
> little harsh, at worst it is defamatory.
>
> It is my belief bulging Earls coolers are caused by fatigue, fatigue
> caused by pressure fluctuations, pressure fluctuations developed in the
> Jabiru oil system. I saw a bulging Earls cooler on a 3300 two weeks ago,
> about 350 hours, not leaking though.
> The numbers are something like: tested to 11 bar, operating at 4.5 bar
> so why else should a cooler fail or bulge?
>
> When there is a failure of this sort it is important to get to the root
> cause, stopping when you think you have the issue sorted can put you in
> a disadvantaged position, or a field.
> I believe the root cause of Earls coolers failing on Jabiru engines is
> pressure fluctuations.
>
> 'B' is right to suggest that anyone who has an Earls cooler should check
> it, in fact anyone with an oil cooler should check it as I believe most
> Jabiru engines have pressure fluctuations.
> Positech coolers seem to be tolerant of the Jabiru oil system, looking
> at the website they seem to manufacture industrial coolers for plant
> where as Earls seem to be automotive.
> Positech coolers are unfortunately not a good shape for many cowlings.
> >From what I can gather, Jabiru in Australia use an hydraulic cooler for
> a auto transmission, not as efficient in heat transfer but robust from a
> pressure perspective.
>
> Regards, Clive
> 2200 in an SP (#596)
> 3300 in an Esqual (#1460)
>
>
> -----Original Message-----
> From: jabiruengines@yahoogroups.com
> [mailto:jabiruengines@yahoogroups.com] On Behalf Of Brian Anderson
> Sent: 14 September 2011 20:48
> To: jabiruengines@yahoogroups.com
> Subject: Re: [jabiruengines] Oil Cooler Failure
>
> Any chance of scanning the piece for those of us that cannot get the
> magazine.
>
> Was it on a Jabiru engine ?
>
> Brian
>
>
> On 15/09/2011, at 3:31 AM, Barbara Davies wrote:
>
> > The Latest U.K. L.A.A. Magazine (September) shows a failure in an
> > Earls
> > 41006 type oil cooler. This type of cooler used to be supplied by Jab
> > in the U.K., and possibly in other countries. There are
> > unsubstantiated rumours of other failures in this type of oil cooler.
> > The outer plates bulge due to poor manufacturing technique. This then
> > causes the side-wall to fracture, leading to a loss of oil. The
> > failure should have shown up if the cooler was tested to 175psi, which
>
> > the manufacturer claims to carry out.
> > This type of cooler was replaced with a Positech type which has not
> > had reports of failure. Anybody who has an Earls cooler may want to
> > look at it carefully, and look for signs of deformation in the top or
> bottom plates.
> > Cheers,
> > B.
> >
>
>
> [Non-text portions of this message have been removed]
>
>
> ------------------------------------
>
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>
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>
>
Message 3
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| Subject: | Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 |
List,
I made it up to the hangar today and put the ram air ducts back on the engine and
ran it up and down the taxi way until the oil was 120 deg. Brought it into
the hangar and burned my fingers getting the plugs out. Guess what - Pete you
were right. the compression came up into the mid 70's on all the cylinders that
were down.
Thanks Pete
Bobby
Jab 3300
125 hrs.
Do Not Archive
----- Original Message -----
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