Today's Message Index:
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1. 04:43 AM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (JL2A)
2. 09:44 AM - Re: Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (doug sapp)
3. 10:48 AM - Re: [Non-DoD Source] Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Bitterlich, Mark G CIV NAVAIR, WD)
4. 01:54 PM - for sale - AN-12 ball valve (formerYakowner)
5. 02:01 PM - FOR SALE - Timing tools (formerYakowner)
Message 1
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
thanks all. yes the filter is on the engine-to-cooler line.
Have heard of others pulling cylinders and hand cleaning, for a freshly overhauled
engine that costs $27,000 from the military/factory! Ludicrous.
I wish someone would start doing proper certified overhauls of these things, we
have to chuck them out every 600 hours. Such a waste. (used for commercial operations,
cannot run on-condition)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456601#456601
Message 2
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
JL2A,
If you read the description of work as comes from the Chinese factory or
military, you will not find the word "overhauled". They use terms like
"new", 1st repairment, 2nd repairment, and so on. "Overhaul" is a western
term.
It is my understanding that they run a new engine 600 hours and send it in
for repair which consists of a top overhaul only unless it is making
metal. If they do split the case it is the mechanics call rather they
replace the bearings with new or reuse them. A 3rd overhaul would only
have to run another 600 hours, so it would be doubtful if they would
"waste" a new set of bearing on it. The 4th time engines are used for
powering agriculture pumps and wind machines. All accessories are repaired
or replaced at each interval.
Theoretically this would mean that you should be able to run your engines
to 1800 TT providing to did a top overhaul every 600 hours.
Best,
Doug
On Fri, May 27, 2016 at 4:42 AM, JL2A <info@flyingwarbirds.com.au> wrote:
>
> thanks all. yes the filter is on the engine-to-cooler line.
>
> Have heard of others pulling cylinders and hand cleaning, for a freshly
> overhauled engine that costs $27,000 from the military/factory! Ludicrous.
>
> I wish someone would start doing proper certified overhauls of these
> things, we have to chuck them out every 600 hours. Such a waste. (used for
> commercial operations, cannot run on-condition)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=456601#456601
>
>
Message 3
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly |
'Overhauled' HS6A
The concept is excellent. Not sure of actual CFM of air flow. I suppose what
I am really saying is that it is a complex question. Two oil coolers (one on
each side) mounted in the cowl might work. It also will restrict air flow through
the cowl to some extent, causing higher internal temps. How much? Just
a little? Too much? I have only a basic rudimentary knowledge of thermal dynamics,
but it seems to me that it is a rather complex question. There are lots
of BTU's to be gotten rid of, and lots of factors to make it work correctly.
Imitating other successful designs is a lot safer than trying to come up with
totally new plan. Obtaining bigger, or more efficient oil coolers seems
safer than trying to relocate them.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Robin Hou
Sent: Thursday, May 26, 2016 4:12 PM
Subject: Re: [Non-DoD Source] Re: Yak-List: Oil Sludge, Carbon Flakes, Freshly
'Overhauled' HS6A
How about NACA inlet and cooler duct like these?
https://www.aircraftspruce.com/catalog/appages/nacainlets.php
https://www.aircraftspruce.com/pages/ep/oilcoolers_zairduct/oilcoolerplenum.php
On Thursday, May 26, 2016 12:09 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
wrote:
Will you get the necessary air flow with it mounted in the cowl?
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Robin Hou
Sent: Thursday, May 26, 2016 2:45 PM
Subject: [Non-DoD Source] Re: Yak-List: Oil Sludge, Carbon Flakes, Freshly 'Overhauled'
HS6A
I always wonder why we can't replace the stock oil cooler with a 300 hp class Stewart
Warner style oil cooler? There is room to install it in the engine cowl
so we don't have to deal with replacing the long oil hoses every few years (very
labor intensive job). At around $500, these U.S. oil coolers are not cheap
but savings on the oil hose replacement should justify the cost. What do you
think?
On Thursday, May 26, 2016 11:15 AM, Walter Lannon <wlannon@shaw.ca> wrote:
"Ultrasonically cleaned oil tank and cooler -------- everything is squeaky clean"
Well, not necessarily. Back in the early days of NDT in the airline business we
used radiography (x-ray) to confirm the internal condition of
DC-6 (R2800) oil coolers after their time on the auto flushing/shaking fixture.
Worked just fine for this aluminum alloy cooler as carbon, sludge, metal etc.
provided adequate density for a good radiographic image.
We also operated DC-3's which used the traditional AN oil cooler made of copper,
brass and lead. The CJ cooler is it's little brother. No radiographic technique
was found adequate and our standard procedure for overhaul was to remove
sections of the tubing to enhance the cleaning process and provide visual inspection
access.
Tubing replaced (soldering process) after cleaning.
Today it is probably cheaper to buy a NEW, not "cleaned" cooler if you want to
approach airline standards.
Walt
-----Original Message-----
From: JL2A
Sent: Thursday, May 26, 2016 3:09 AM
Subject: Yak-List: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A
Have come across this more than once before... first time running an 'overhauled'
[Rolling Eyes] engine, heap of carbon flakes and sludge breaks loose and gets
trapped in the firewall oil filter screen.
This time a little different... we installed a full flow filter on the output side
of the engine as per CPs instructions. New oil hoses.
Ultrasonically cleaned oil tank and oil cooler. So aside from the engine, everything
is squeaky clean.
Ran engine for 1 hour. Cut filter, flakes, but not too many. Pulled oil screen
- chocked full!
How is this so? If the filter is catching anything that comes out of engine, how
does it end up on the inlet side of the engine? The filter does not seem at
all blocked and gotta assume it is not bypassing...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456568#45656m/Navigator?Yak-List" target="_blank">http://www.matronics.com/Navigator?p; <http://www.matronics.com/Navigator?p;> --> <http://forums.matronics.com/viewtopic.php?p=456568#456568> http:======================== <http://forums.matronics.com/> http: &nbs//www.matronics.com/contribution" target="_blank">http://www.matronics.co================== <http://www.matronics.co%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D/>
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Message 4
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| Subject: | for sale - AN-12 ball valve |
contact off list cetopfed(at)gmail.com
Brand new $75:
Speedflow machined aluminium ball valve. Compatible with air, water, oil and all
regular fuels.
The internal bore is full flow even at the ball, there is no reduction in diameter
The control lever can be repositioned
The control lever has a 4.5mm hole to allow control cables (Morse type or other)
or control equipment to be connected
The top face of the ball valve (under the control lever) is machined flat and it
has pre-drilled and threaded fixing holes (supplied with two dome head bolts)
to allow this valve to be fitted through a panel or bracket.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456627#456627
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Message 5
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| Subject: | FOR SALE - Timing tools |
Contact off list: cetopfed(at)gmail.com
$225
All stuff new 2014. compression tester, mag-rite timing kit, TDC tool (M-14P(dot)com).
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456628#456628
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