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peter.rees01(at)tiscali.c
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 Posted: Sun Oct 24, 2010 1:42 pm Post subject: Ignition Module |
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By a process of substitution, it would appear that one of the 2 ignition
modules on our 912 powered Europa has developed an intermitant fault.
The price for these in the UK is a shade under £700!! Does anyone know a way
of getting hold of one at a more attractive price than that? (looking for
the version with the 4 way plug).
Thanks
Peter (G-MFHI)
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nigel_graham(at)m-tecque.
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| Posted: Sun Oct 24, 2010 10:34 pm Post subject: Ignition Module |
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Peter,
This is a well known problem with the older 4 way plug versions. Before
you shell out for a new ignition unit, take a good look at the flying
leads from the "black box" to the connector.
The prolonged vibration tends to work harden the copper leads and they
eventually fracture within their plastic sheathing (hidden from view),
making intermittent contact.
I won't pretend that its easy to spot, but it's a lot cheaper than a new
unit!
Nigel
On 24/10/2010 22:38, Peter Rees wrote:
| Quote: |
<peter.rees01(at)tiscali.co.uk>
By a process of substitution, it would appear that one of the 2
ignition modules on our 912 powered Europa has developed an
intermitant fault.
The price for these in the UK is a shade under £700!! Does anyone know
a way of getting hold of one at a more attractive price than that?
(looking for the version with the 4 way plug).
Thanks
Peter (G-MFHI)
|
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riddon(at)sent.com
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| Posted: Sun Oct 24, 2010 11:25 pm Post subject: Ignition Module |
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Peter,
I have a friend who repairs Rotax, mainly for microlights. Keith
Worthington, Eccleston Aviation. He may be able to help you.
Email worthington.keith(at)yahoo.co.uk or phone him on 01257453430.
Richard Iddon G-RIXS
---
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peter.rees01(at)tiscali.c
Guest
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| Posted: Mon Oct 25, 2010 8:13 am Post subject: Ignition Module |
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Thanks for the response.
The problem diesn't result in a 'dead cut' when selecting the rogue
unit - just a drop of about 200 RPM (as opposed to about 75 on the good
unit). The fault also only seems to happen when the engine is up to
temperature (which makes ground testing significantly more difficult).
Both of these lead me to believe that the problem is inside the box
(though I suppose that it is possible that as the engine comes up to
temperature, the insulation on the wires softens and the resulting
increaded allows a damaged wire to move more than when cold).
----Original Message----
From: nigel_graham(at)m-tecque.co.uk
Date: 25/10/2010 7:31
To: <europa-list(at)matronics.com>
Subj: Re: Ignition Module
co.uk>
Peter,
This is a well known problem with the older 4 way plug versions.
Before
you shell out for a new ignition unit, take a good look at the flying
leads from the "black box" to the connector.
The prolonged vibration tends to work harden the copper leads and
they
eventually fracture within their plastic sheathing (hidden from
view),
making intermittent contact.
I won't pretend that its easy to spot, but it's a lot cheaper than a
new
unit!
Nigel
On 24/10/2010 22:38, Peter Rees wrote:
| Quote: | <peter.rees01(at)tiscali.co.uk>
|
| Quote: | By a process of substitution, it would appear that one of the 2
|
| Quote: | ignition modules on our 912 powered Europa has developed an
|
| Quote: | intermitant fault.
|
| Quote: | The price for these in the UK is a shade under £700!! Does anyone
know
|
| Quote: | a way of getting hold of one at a more attractive price than that?
|
| Quote: | (looking for the version with the 4 way plug).
|
_-
============================================================
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nigel_graham(at)m-tecque.
Guest
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| Posted: Mon Oct 25, 2010 11:25 am Post subject: Ignition Module |
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Peter,
I have a few more suggestions before you reach for your cheque-book.
First, check that the plugs are not breaking down by swapping over the
plug lead pairs on each cylinder then restart the engine and see if the
fault moves to the "other" mag. If it does, then the plugs (or leads)
are the problem.
If not, reset the plug leads to their original positions.
Second, check that both trigger coils are timed correctly. You'll need
a strobe for this. Run the engine on only one mag, note the timing
position, then run on only the other mag and see if the timing is the
same on both. If one is running retarded, you will get a drop in RPM on
that mag. You don't say which engine you are using. The 914
deliberately times both mags differently (it's used to control
pre-ignition), the 912(s) should be the same.
Don't be surprised if there is a difference as engines leave the Rotax
factory with the trigger coil gap-settings varying greatly.
If you can get down the back of the engine, try and check these gaps and
the security of the clamping screws (details in the maintenance manual).
You will find four trigger coils, two for retarded timing for starting
and two for advanced timing for running.
If you have a pre-March 1999 engine check to see if the service bulletin
SB 912 026/E (for a 912) or SB 914 014/E revision2 (for a 914) were
complied with (check engine log).
Early stators had a problem with the insulation material which allowed
some solvents and fuel to dissolve it. The SB's addressed this by
replacing the whole stator with an improved replacement from Rotax -
again, your engine log should record this.
Lastly, you can isolate the problem to either the ignition modules or
the trigger coils by swapping over both sets of red trigger wires
between the stator to the modules (they are dual redundant), If the
problem remains with the same mag - the ignition modules are the problem
and if the fault swaps to the other mag - the trigger coils are the problem.
A lot to go through, but if you approach it methodically, it should be
straight forward.
Refer to the Rotax manual, you will find it covers this quite well.
............and if you don't have one, contact me off-list and I'll
send you the latest manual in .pdf format.
Nigel
On 25/10/2010 16:39, peter.rees01(at)tiscali.co.uk wrote:
| Quote: |
Thanks for the response.
The problem diesn't result in a 'dead cut' when selecting the rogue
unit - just a drop of about 200 RPM (as opposed to about 75 on the good
unit). The fault also only seems to happen when the engine is up to
temperature (which makes ground testing significantly more difficult).
Both of these lead me to believe that the problem is inside the box
(though I suppose that it is possible that as the engine comes up to
temperature, the insulation on the wires softens and the resulting
increaded allows a damaged wire to move more than when cold).
|
| | - The Matronics Europa-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:
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mikenjulie.parkin(at)btin
Guest
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| Posted: Mon Oct 25, 2010 11:43 am Post subject: Ignition Module |
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Have you changed the plugs, this is an indication of a plug breakdown at higher temp/pressure.
Regards,
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of peter.rees01(at)tiscali.co.uk
Sent: 25 October 2010 16:39
To: europa-list(at)matronics.com
Subject: Re: Ignition Module
--> Europa-List message posted by: "peter.rees01(at)tiscali.co.uk" <peter.rees01(at)tiscali.co.uk>
Thanks for the response.
The problem diesn't result in a 'dead cut' when selecting the rogue
unit - just a drop of about 200 RPM (as opposed to about 75 on the good
unit). The fault also only seems to happen when the engine is up to
temperature (which makes ground testing significantly more difficult).
Both of these lead me to believe that the problem is inside the box
(though I suppose that it is possible that as the engine comes up to
temperature, the insulation on the wires softens and the resulting
increaded allows a damaged wire to move more than when cold).
----Original Message----
From: nigel_graham(at)m-tecque.co.uk
Date: 25/10/2010 7:31
To: <europa-list(at)matronics.com>
Subj: Re: Ignition Module
--> Europa-List message posted by: Nigel Graham <nigel_graham(at)m-tecque.
co.uk>
Peter,
This is a well known problem with the older 4 way plug versions.
Before
you shell out for a new ignition unit, take a good look at the flying
leads from the "black box" to the connector.
The prolonged vibration tends to work harden the copper leads and
they
eventually fracture within their plastic sheathing (hidden from
view),
making intermittent contact.
I won't pretend that its easy to spot, but it's a lot cheaper than a
new
unit!
Nigel
On 24/10/2010 22:38, Peter Rees wrote:
> --> Europa-List message posted by: "Peter Rees"
> <peter.rees01(at)tiscali.co.uk>
>
> By a process of substitution, it would appear that one of the 2
> ignition modules on our 912 powered Europa has developed an
> intermitant fault.
>
> The price for these in the UK is a shade under £700!! Does anyone
know
> a way of getting hold of one at a more attractive price than that?
> (looking for the version with the 4 way plug).
>
> Thanks
>
> Peter (G-MFHI)
>
>
>
>
_-
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peter.rees01(at)tiscali.c
Guest
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| Posted: Mon Oct 25, 2010 12:25 pm Post subject: Ignition Module |
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Hi Nigel
Thanks for a very comprehensive check list - we had tried almost everything
on there already. Stator has been changed very early on in the aircrafts
life.
The substitution I mentioned in my initial E-mail included a good ignition
module - when this is fitted, the problem seems to have been cured - hence,
rather unfortunately, I believe I'm looking for a source of a module cheaper
than the normal 'retail'. I've E-mailed Lisa at Redair to see if she can
come up with anything.
Thanks very much for the advice
Peter
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