 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
ReadeG(at)Cairnwood.com
Guest
|
 Posted: Mon Feb 25, 2008 6:17 pm Post subject: Yak-List - It's a Mark & Brian discussion! |
 |
|
OK - you guys jinxed me - all this talk about generators has done me in.
I go to fly the Wilga yesterday - first time in ages - she fires up -
good, go to warm up speed and generator comes on line - good, taxi
around and go to low idle - generator goes offline - good, bring rpm
back up and oops - no generator! Go low idle and back to high idle -
nothing. Reset generator switch - nothing. Cycle overvoltage
protection - nothing. Cycle low voltage circuit - nothing. Shut
down/restart - no change. So, now I get to do the generator trouble
shoot thing and I hope I have what I need in the spares kits. Can't
change out the generator - it's licensed in the normal category so I
don't think I can go the alternator route (i.e. no approved alternators
for this application). And it was the first nice day in ages - oh
well....
BTW - after reading the hours of stuff you guys put out I believe I'm
ready for the generator/alternator CEU test. How much credit is it
worth?
Signed,
I like fixing most everything except the stuff with wires.
Reade Genzlinger
Cairnwood Cooperative Corporation
mailto:readeg(at)cairnwood.com
215.914.0370
| | - The Matronics Yak-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?Yak-List |
|
|
|
| Back to top |
|
 |
viperdoc(at)mindspring.co
Guest
|
| Posted: Mon Feb 25, 2008 7:59 pm Post subject: Yak-List - It's a Mark & Brian discussion! |
|
|
I do not know much about the Wilga but does it have a power distribution
panel? Does it have BNP 200? Where are your Russian fuses mounted. I would
take them out of the circuit and ohm them out. Particularly the 30 amp fuse
inline with the carbon pile regulator and the BNP 200. Mark B+9 can help
with this one a bunch. He helped me.
Doc
--
| | - The Matronics Yak-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?Yak-List |
|
|
|
| Back to top |
|
|
ReadeG(at)Cairnwood.com
Guest
|
| Posted: Tue Feb 26, 2008 6:02 am Post subject: Yak-List - It's a Mark & Brian discussion! |
|
|
Hi Doc -
Yeah - we're deep into all of that now. Interestingly enough, only
certain parts of the system are "Russian" - a good number of parts, like
all the relays, are quite different from what's in my Yak. As many of
you probably know, the AI-14 engine that the Wilga's use was the
original engine in the CJ's. It was fairly quickly changed to the
285hp.
Reade Genzlinger
Cairnwood Cooperative Corporation
mailto:readeg(at)cairnwood.com
215.914.0370
--
| | - The Matronics Yak-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?Yak-List |
|
|
|
| Back to top |
|
|
mark.bitterlich(at)navy.m
Guest
|
| Posted: Tue Feb 26, 2008 11:48 am Post subject: Yak-List - It's a Mark & Brian discussion! |
|
|
Reade, is the system on the Wilga anything like the YAK's and Sukes? I
would think that it is. Steps to consider:
1. Make sure your generator really is off-line. Just because a light
stays on and does not go out, does not necessarily mean your generator
is not working. If you have a volt meter installed, or an ammeter...
Check that and see if you can see the voltage increase, or... The
current change with engine RPM.
2. Pull the cowl and look inside of the generator and make sure it
actually moves as you pull the prop through. The generator is built
with a shaft that is intended to shear on certain loads. Yours could
have sheared. Have someone pull the prop through as you look at the
insides very closely.
3. Somehow connect a voltmeter to the two main contacts on the
generator, leaving all the normal wiring in place. Be wary of alligator
clips, they tend to blow off. Start the engine and be very careful of
watching exactly what the voltmeter is doing. If it climbs to 28 volts
(+/- 1 or so) and then stabilizes and goes no higher as you increase
engine RPM past 60%, then your generator and voltage regulator are ok.
This is a critical step and from here the path splits in two directions.
A. Your main contactor is not pulling in, and this requires a whole
series of testing steps, and will probably result in a device called the
"Combined Device" being bad.
B. The generator itself is bad.
This is enough to get you started... Sort of.
Mark Bitterlich
--
| | - The Matronics Yak-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?Yak-List |
|
|
|
| Back to top |
|
|
ReadeG(at)Cairnwood.com
Guest
|
| Posted: Tue Feb 26, 2008 12:09 pm Post subject: Yak-List - It's a Mark & Brian discussion! |
|
|
Reade, is the system on the Wilga anything like the YAK's and Sukes? I
would think that it is. Steps to consider:
1. Make sure your generator really is off-line. Just because a light
stays on and does not go out, does not necessarily mean your generator
is not working. If you have a volt meter installed, or an ammeter...
Check that and see if you can see the voltage increase, or... The
current change with engine RPM.
[Reade Genzlinger] Checked and no change in volts or amps.
2. Pull the cowl and look inside of the generator and make sure it
actually moves as you pull the prop through. The generator is built
with a shaft that is intended to shear on certain loads. Yours could
have sheared. Have someone pull the prop through as you look at the
insides very closely.
[Reade Genzlinger] Will do.
3. Somehow connect a voltmeter to the two main contacts on the
generator, leaving all the normal wiring in place. Be wary of alligator
clips, they tend to blow off. Start the engine and be very careful of
watching exactly what the voltmeter is doing. If it climbs to 28 volts
(+/- 1 or so) and then stabilizes and goes no higher as you increase
engine RPM past 60%, then your generator and voltage regulator are ok.
This is a critical step and from here the path splits in two directions.
[Reade Genzlinger] OK - will do.
A. Your main contactor is not pulling in, and this requires a whole
series of testing steps, and will probably result in a device called the
"Combined Device" being bad.
[Reade Genzlinger] We suspect the relay and I am waiting to hear from my
mechanic on this one.
B. The generator itself is bad.
[Reade Genzlinger] naw - we won't go there (yet)......
This is enough to get you started... Sort of.
[Reade Genzlinger] Thanks - as you may know - there is NO room to work
on anything from the instrument panel forward on a Wilga.
| | - The Matronics Yak-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?Yak-List |
|
|
|
| Back to top |
|
|
warner.wesley(at)gmail.co
Guest
|
| Posted: Tue Feb 26, 2008 12:40 pm Post subject: Yak-List - It's a Mark & Brian discussion! |
|
|
Reade,
I'm no expert with this kind of thing, and don't know the Wilga
wiring. That being said... I had a Yak 55M that had a similar thing
happen. My Yak had a large-ish electrical box behind the instrument
panel that housed relays etc... I opened that box and found one of
the larger wires had broken at the terminal. It was a fast easy fix.
Just figured I'd pass that along.
Wes
On Mon, Feb 25, 2008 at 9:13 PM, Genzlinger, Reade <ReadeG(at)cairnwood.com> wrote:
| Quote: |
OK - you guys jinxed me - all this talk about generators has done me in.
I go to fly the Wilga yesterday - first time in ages - she fires up -
good, go to warm up speed and generator comes on line - good, taxi
around and go to low idle - generator goes offline - good, bring rpm
back up and oops - no generator! Go low idle and back to high idle -
nothing. Reset generator switch - nothing. Cycle overvoltage
protection - nothing. Cycle low voltage circuit - nothing. Shut
down/restart - no change. So, now I get to do the generator trouble
shoot thing and I hope I have what I need in the spares kits. Can't
change out the generator - it's licensed in the normal category so I
don't think I can go the alternator route (i.e. no approved alternators
for this application). And it was the first nice day in ages - oh
well....
BTW - after reading the hours of stuff you guys put out I believe I'm
ready for the generator/alternator CEU test. How much credit is it
worth?
Signed,
I like fixing most everything except the stuff with wires.
Reade Genzlinger
Cairnwood Cooperative Corporation
mailto:readeg(at)cairnwood.com
215.914.0370
|
| | - The Matronics Yak-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?Yak-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
