Today's Message Index:
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1. 09:59 AM - Re: Pre flight Problem (Noel Loveys)
2. 02:58 PM - Re: Pre flight Problem (Pete Christensen)
Message 1
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| Subject: | Pre flight Problem |
You can test the output of your alternator with an AC voltmeter. Output
should be well over 16V at cruise RPM. Generally there are two things that
can go wrong with an alternator.
One is the brushes wear out. If this happens you will observe a short
period of time where the system charges, doesn't charge, charges etc. In
other words charges intermittently.
Another thing that can generally go wrong with the alternator is the field
coil can burn open. No field produced by the field coil no output from the
alternator. Related to this is bushings on the alternator can wear enough
to allow the field coil to short against the interior of the housing....
Same effect as above. Note the Rotax 582 engines don't have a field coil.
They have a dirt big magnet instead so they use a system of shunting excess
power to ground. This means if your stator coils ring out true the problem
is probably in your regulator/rectifier.
This is where I have noticed most of the problems come from. The rectifier
regulator generally requires a good ground through the back of its case.
First thing to do is remove the rectifier/regulator, clean its back and the
space it will occupy on the firewall and reinstall it. The next thing to do
is to locate the braid that goes from the engine to the frame of the plane.
Make sure the connections on both ends of this braid are shiny clean too.
There is a small chance that your rectifier/regulator has gone on strike.
You can get it checked out at any automotive shop that specializes in
starter motors, etc.
Hope this helps
Noel
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Malcolm
Brubaker
Sent: November 16, 2011 10:30 PM
Subject: Re: Kitfox-List: Pre flight Problem
good luck man good luck
Malcolm & Jeanne Brubaker
Michigan Sport Pilot Repair
LSRM-A, PPC, WS
Great Sails - Sailmaker
for Ultralight & Light Sport
(989)513-3022
From: Lloyd & Lorrie Cudnohufsky <7suds@Chartermi.net>
Sent: Tuesday, November 15, 2011 8:25 PM
Subject: Kitfox-List: Pre flight Problem
<7suds@chartermi.net>
Guys,
Getting ready for my maiden voyage and am having a problem with charging. My
amp meter shows a negative draw and the volt meter shows 12 volts, as I turn
things on the amp draw goes more negative. All indications are that the
system is not charging, I am running a Kuntzleman Hotbox. Pretty sure all is
wired correct. Any suggestions where to start? Can I check the AC output of
the charging coils? Any chance that the voltage regulator would be the
culprit?
Also on a side note, is anyone monitoring their cooling water temp other
than as CHT? If so where do you have the probe and what are you seeing for
water temp?
Thanks,
Lloyd C
5 Outback 912ul IVO IFA
Northern Mi.
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Message 2
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| Subject: | Re: Pre flight Problem |
Sorry Noel! Make that a Large Chance that the rectifier/regulator has
gone on strike.
Pete
Leander, TX
Kitfox III, 912
On 11/18/2011 11:56 AM, Noel Loveys wrote:
>
> You can test the output of your alternator with an AC voltmeter.
> Output should be well over 16V at cruise RPM. Generally there are two
> things that can go wrong with an alternator.
>
> One is the brushes wear out. If this happens you will observe a short
> period of time where the system charges, doesn't charge, charges etc.
> In other words charges intermittently.
>
> Another thing that can generally go wrong with the alternator is the
> field coil can burn open. No field produced by the field coil no
> output from the alternator. Related to this is bushings on the
> alternator can wear enough to allow the field coil to short against
> the interior of the housing.... Same effect as above. Note the Rotax
> 582 engines don't have a field coil. They have a dirt big magnet
> instead so they use a system of shunting excess power to ground. This
> means if your stator coils ring out true the problem is probably in
> your regulator/rectifier.
>
> This is where I have noticed most of the problems come from. The
> rectifier regulator generally requires a good ground through the back
> of its case. First thing to do is remove the rectifier/regulator,
> clean its back and the space it will occupy on the firewall and
> reinstall it. The next thing to do is to locate the braid that goes
> from the engine to the frame of the plane. Make sure the connections
> on both ends of this braid are shiny clean too.
>
> There is a small chance that your rectifier/regulator has gone on
> strike. You can get it checked out at any automotive shop that
> specializes in starter motors, etc.
>
> Hope this helps
>
> Noel
>
>
> <7suds@chartermi.net <mailto:7suds@chartermi.net>>
>
> Guys,
> Getting ready for my maiden voyage and am having a problem with
> charging. My
> amp meter shows a negative draw and the volt meter shows 12 volts, as
> I turn
> things on the amp draw goes more negative. All indications are that the
> system is not charging, I am running a Kuntzleman Hotbox. Pretty sure
> all is
> wired correct. Any suggestions where to start? Can I check the AC
> output of
> the charging coils? Any chance that the voltage regulator would be the
> culprit?
> Also on a side note, is anyone monitoring their cooling water temp other
> than as CHT? If so where do you have the probe and what are you seeing for
> water temp?
>
> Thanks,
> Lloyd C
> 5 Outback 912ul IVO IFA
> Northern Mi.
>
>
> <http://www.matronics.com/contribution>
>
>
> *_*_
> *
>
> *
> _*_*
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