Today's Message Index:
----------------------
1. 02:38 AM - Re: Yak-List Digest: 3 Msgs - 08/11/07 (Robert Starnes)
2. 06:52 AM - Re: Compressor (A. Dennis Savarese)
3. 07:09 AM - Wilga (Kelley Monroe)
4. 09:42 AM - Re: Wilga (Joe Howse)
5. 10:02 AM - Air Compressor Warning (vectorwarbirds@aol.com)
6. 12:04 PM - Re: Air Compressor Warning (Brian Lloyd)
7. 02:16 PM - Sighting device for Yak-55M (Pilot2874)
8. 06:54 PM - Re: Wilga (Herb Coussons)
9. 07:03 PM - Re: Sighting device for Yak-55M (Herb Coussons)
10. 09:55 PM - Re: Sighting device for Yak-55M (mikspin)
Message 1
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| Subject: | Re: Yak-List Digest: 3 Msgs - 08/11/07 |
Removing the air compressor is not all that difficult
in my experience, at least on the CJ-6. A Snap-on 11mm
swivel socket and a set of wobble extensions are an
absolute must, though. don't go cheap here, pony up
for the snap-on, the first socket I used was a
craftsman that broke trying to turn the L/H underside,
hard to see nuts. Took about an hour. Has anyone
experienced the gap of the compressor rings aligning?
I've had that happen before too, a good hard run at
the end of the runway , varying the power settings got
'em back right.
Just my 2 cents. (worthless at current exchange
rates.) -Robert Starnes
Message 2
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Pull the output check valve assembly from the compressor. Clean it and
replace the crush washers with new crush washers. Make sure the spring in
the check valve is not broken and the little piston and its spring moves
freely with light pressure. It is quite common to have the output check
valve banjo fittings leak under higher pressure due to the cap loosening and
the crush washers not completely sealing.
I would also pull the snot bottle off the airplane and thoroughly clean and
flush it out. This too can cause the system not to properly charge to the
full pressure relief valve setting (ie: the pop-off valve). While you're at
it, you might as well remove the one and only air filter directly below the
pop-off valve and clean/replace it. IF you can disassemble it, Doug Sapp
stocks the internal screens for it.
Dennis
----- Original Message -----
From: "Scooter" <yakk52@verizon.net>
Sent: Saturday, August 11, 2007 3:46 PM
Subject: Yak-List: Compressor
>
> Always a fun topic. So the issue is the compressor is a bit lethargic.
> Maybe making about 40atm and taking some time to do it. After landing and
> using the brakes a bit I might only have 35 when i put it away.
>
> After running there's enough residual pressure to blow the snot out but
> maybe not as much as before. If I add external air the pop-off operates
> up around 50atm.
>
> I removed the cowl and checked hose couplings with the engine running and
> didn't detect any leaks (I would guess that it would be noticeable with
> your hand clamped over the fitting?). Haven't yet attempted to charge the
> pump-to-snot section and check for leaks.
>
> I'm thinking this will probably require a compressor rebuild and am
> assuming it will most likely be the rings on the piston. Any chance I can
> pull the cylinder and replace these rings or should I pull the entire
> assembly? Anyone know roughly what a rebuild costs? Note that I've read
> the previous posts on removing the compressor, etc. great advice and I'm
> not looking forward to it.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=128649#128649
>
>
>
Message 3
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I am looking at buying a Wilga 104-35 or 104-80 to fly out of my farm.
Does anyone have in information to share. Thanks Kelley
Message 4
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Kelley
Would you be interested in a PZL 101 ( forerunner to the Wilga ?)
Recently restored in Victoria by Victoria Air Maint.
Contact me at joeh@shaw.ca for info and pics.
Joe
Message 5
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| Subject: | Air Compressor Warning |
We just completed rebuilding three air compressors
pulled from 400 to 1200 hour engines and feel you all should be aware
of what we found.? First you should know that there are THREE valves at
and in the compressor.? One is external at the cylinder and two are
internal valves. One is located in the cylinder head and the other in
the piston itself and the most important.? The piston valve and its
airways were virtually clogged with burned oil residue, the airways are
5/32" in diameter are run down and out the sides of the piston.? Those
holes were clogged to about the size of a safely wire when we removed
the piston.? You will most likely NOT be able to remove the piston
valve yourself without the special tools to do so. There are both
vertical and horizontal holes running through the piston so the crown
valve has to be removed to clean them all.
As a test we submerged one of the uncleaned and un-assembled
pistons in carbon cleaner in our heated ultrasonic cleaner and left it
for 48hrs to just see if this would clear the passageways and clean the
valve without having to disassemble the valve system, almost zero
cleaning after we took the thing apart so this is not an option.
The piston valve is just like the external valve, poppet valve
and spring. They were completely clogged as well as all the passageways.
From
this experiment we are going to pull our newly cleaned compressor in
two years to see what kind of build up has occurred during that time,
then we will know a schedule for cleaning.? So in closing we would
recommend that everyone take a hard look at pulling the cylinder and
having the system cleaned at the least.? You can pull the cylinder only
as there is no need to remove the compressor body from the engine for
this program.? We also replaced all the nuts with locking 10mm head
size to make R&R easier in the future.
We believe that at least one aircraft has had an engine
failure resulting from the loss of the compressor which sheared an
accessory drive gear.? (CJ6).? If the valves and holes become totally
clogged the compressor is working against itself to compress air that
has nowhere to go, major heat buildup as well all know in compressors.?
We also recommend a compressor overboard or dump valve to let the
compressor 'freewheel' when building air is not required.? We open the
valve on climb and close it when down wind. (Ck list).
Let us know if you have any questions.
Vector Aviation USA
--
Bunndini
"Wasn't there something in your life worth losing everything for?"
Mulay Achmed Mohammed el-Raisuli the Magnificent, Lord of the Riff, Sultan to the
Berbers - 1902
________________________________________________________________________
Message 6
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| Subject: | Re: Air Compressor Warning |
On Aug 12, 2007, at 1:01 PM, vectorwarbirds@aol.com wrote:
> The piston valve and its airways were virtually clogged with burned
> oil residue, the airways are 5/32" in diameter are run down and out
> the sides of the piston. Those holes were clogged to about the
> size of a safely wire when we removed the piston.
This strikes me as a call for an oil less prone to breakdown and
coking. An engine that has been flown on lower-quality mineral oil
might be more likely to have this type of problem.
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
Message 7
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| Subject: | Sighting device for Yak-55M |
Hi there,
Does anyone have any information on where/how to manufacture or buy and install
sighting devices on Yak-55M? I recently bought the Yak-55M looking to add sighting
devices to it.
Any input will be greatly appreciated.
thanks,
Kirill
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=128795#128795
Message 8
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I have one, its for sale, although I have 2 people looking at it this
week. I really like it, and would be happy to share all I know about
them. I have put almost 150 hours on mine in just over 2 years. It
is quite the machine.
Contact me off list and I'll be happy to share what I know.
Herb
Cell 920-639-8434
On Aug 12, 2007, at 9:08 AM, Kelley Monroe wrote:
> I am looking at buying a Wilga 104-35 or 104-80 to fly out of my
> farm. Does anyone have in information to share. Thanks Kelley
> http://www.matronics.com/Navigator?Yak-List_-
> ============================================================ _-
> forums.matronics.com_-
> ===========================================================
>
Message 9
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| Subject: | Re: Sighting device for Yak-55M |
I am also interested. Although I think most people just make them, I
do not think there is a standard one. I have photos of several
different ones if you want to look at some options.
Herb
On Aug 12, 2007, at 4:15 PM, Pilot2874 wrote:
>
> Hi there,
>
> Does anyone have any information on where/how to manufacture or buy
> and install sighting devices on Yak-55M? I recently bought the
> Yak-55M looking to add sighting devices to it.
>
> Any input will be greatly appreciated.
>
> thanks,
> Kirill
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=128795#128795
>
>
Message 10
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| Subject: | Re: Sighting device for Yak-55M |
Hi guys,
I'd also like to know what you find out on the sighting device.
Right now I'm planning on making one; I'll post when I do, and if you haven't found
one by then, I could make a couple extra ones.
Mike Hastings
Yak 55M
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=128880#128880
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