Today's Message Index:
----------------------
1. 08:22 AM - Re: More oil leakage (Bitterlich, Mark G CIV NAVAIR, WD)
2. 09:10 AM - Re: Yak-52 fuel starvation ()
3. 01:54 PM - Fuel Starvation - Possible Solution (Elmar & Manuela Hegenauer)
4. 10:17 PM - Who? (cjpilot710@aol.com)
Message 1
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| Subject: | More oil leakage |
This one's a keeper.
Thanks.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
desmor944@aol.com
Sent: Friday, July 05, 2013 14:02
Subject: Re: Yak-List: More oil leakage
Walt and Coop,
Agree on the limitations of tab washers and self locking nuts in
general. I work in the world of industrial gas turbines and steam
turbines where these machines are run 8,000 to 9,000 equivalent
operating hours per year, with overhauls scheduled at 40,000 hours or
more. Vibration and high temperatures are the norm during operation.
The solution to keeping parts in place is the extensive use of Nord-Lock
washers under bolt heads and nuts on studs. These are the ultimate
replacement for split or star type lock washers. The only caution would
be against use with a hardened (> Rockwell 40) nut.
Nord-Lock washers are readily available from Fastenal, Grainger,
McMaster-Carr, MSC Direct, etc. Sizes start at M3, and prices are about
$0.50 per pair up to M8.
Manufacturer's web site is www.nord-lock.com , and this link will show
how the washers work www.youtube.com/watch?v=mgwmuZuJ02I . The new
X-Series is overkill for our applications; the standard wedge locking
washer is sufficient.
Many pairs have found their way firewall-forward on my CJ.
Rich Desmond
-----Original Message-----
From: Walter Lannon <wlannon@shaw.ca>
Sent: Thu, Jul 4, 2013 1:17 pm
Subject: Re: Yak-List: More oil leakage
Hi Coop;
There are self-locking 4 x 0.7 mm nuts available in both carbon and
stainless steel from Fuller Metric and other suppliers. Like all nylon
type lock nuts they should nut be used in areas where the temperature
may exceed
250 deg.F (120C). Generally OK for many areas under the cowl but
should be
evaluated for specific areas on the engine
I have never been impressed with tab washers and in some cases prefer a
simple split type lock washer.
Walt
-----Original Message-----
From: Adrian Coop Cooper
Sent: Wednesday, July 03, 2013 9:37 PM
Subject: Yak-List: More oil leakage
<cooperairracing@gmail.com>
Hi all. My engineer and I have been tracking down an oil leak on my CJ's
Housai 285hp. With the cowls removed and a good Varsol wash down/spray
we ran the engine. Sure enough we found the problem, the starter
distributor was loose. Even though the "lock tabs" were correctly in
place, the three 7mm nuts had backed off. Now any of you who have had
this issue know that these nuts are a B***h to get at and tighten.
After two hours of work and several specialty bendings of 7mm wrenches
they are now tight. (I need to go buy replacement wrenches tomorrow)The
space behind the air lines and banjo fittings is too small for a socket
and its impossible to even get a universal socket in there. Has any one
been able to find Turbine nuts that fit those studs?
The smaller size of the Turbine nuts should make this a manageable job
and, of course, they are self locking. I don't know if there is an
equivalency of the studs to a US SAE size, but that would be great. Any
one have the answer to that?
Thanks Guys.
Coop.
--------
Coop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=403907#403907
et="_blank">http://www.matronics.com/Navigator?Yak-List
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Message 2
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| Subject: | Re: Yak-52 fuel starvation |
Final thoughts on fuel starvation problem -
I went through the fuel system, screens, vent system, flapper valve
assembly, and found nothing out of the ordinary. In theory, one tank
running dry should not cause an interruption of the fuel supply, but
like many systems, the Yak fuel system has a mind of its own. After
hearing of many other fuel starvation stories, I am convinced that when
one tank runs dry there is a very good likelihood that the engine will
quit for a short time. My personal check list is now modified to
include putting the bird on the ground before a tank runs dry.
I did find the slip indicator (ball) 1/8 ball out of adjustment. Flying
with the ball centered should now be much closer to coordinated flight
and help the tanks feed evenly.
Jim Burke
Yak-52 N426YK
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
jimmy@pfmengineering.com
Sent: Tuesday, June 18, 2013 1:53 PM
Subject: Yak-List: Yak-52 fuel starvation
My 1985 Yak-52=99s engine quite about 3 miles from the airport
last Saturday. After some rapid pumping on the hand primer, the engine
fired then quite again, it repeated this several times before running
without stopping although somewhat on the rough side. After landing,
runup for over 1 minute was normal. Right tank was empty and the left
tank had about 10 gallons. I have not torn into the system yet, but
have been told to check the screens for debris, and the flexible fuel
lines for cavitation. I consulted Dennis Savarese and he said that the
right tank running out of fuel would not stop fuel flow to the engine.
Anyone have any thoughts on this subject and what to check while I am
going through the system?
Jim Burke
http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.comhtt
p://www.matronics.com/contribution
Message 3
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| Subject: | Fuel Starvation - Possible Solution |
There is a simple modification for the
fuel imbalance problem with CJs and
Yak52s.
You could run a bypass line from the
left fuel line to the right fuel line at the
header tank. In series of this bypass line
simply install the oil dilution solenoid valve
(many have those removed on their aircraft).
If uneven fuel feed occurs, just flick
the switch and leave the oil dilution
valve open for a while, so fuel can
enter the header tank through the
opposite flapper valve.
Your mileage may vary.
cheers
Elmar
Message 4
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OK guys, I know this is going to sound silly, but remember I'm an old guy
and us old guys tend to have this happen every once in a while.
Question. Who am I rooming with at OSH? Over a month ago ?????? called
and emailed me about sharing a house at OSH. It sounded good - so I said
yes. Well I can't remember who.
Now be gentle with my psyche but would that good person contact me.
:-}
Jim "Pappy" Goolsby
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