Today's Message Index:
----------------------
1. 03:10 AM - Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (JL2A)
2. 03:46 AM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Richard Kelley)
3. 05:37 AM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (cjpilot710@aol.com)
4. 11:05 AM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Walter Lannon)
5. 11:45 AM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Robin Hou)
6. 11:59 AM - Re: [Non-DoD Source] Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Bitterlich, Mark G CIV NAVAIR, WD)
7. 12:05 PM - Re: YAK 50 brakes (Gordon Price)
8. 01:12 PM - Re: [Non-DoD Source] Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Robin Hou)
9. 03:45 PM - Re: Feedback on vendor (Todd McCutchan)
10. 06:01 PM - Re:Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Craig Payne)
11. 09:05 PM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Roger Kemp)
12. 11:05 PM - Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A (Jan Mevis)
Message 1
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| Subject: | 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#456568
Message 2
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
You still have the oil cooler. It has not been cleaned it may just be residual.
Sent from my iPhone
> On May 26, 2016, at 5:09 AM, JL2A <info@flyingwarbirds.com.au> wrote:
>
>
> 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#456568
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
Are you sure you have the external filter on the same line between the
engine and the oil cooler?
Jim "Pappy" Goolsby
In a message dated 5/26/2016 6:46:28 A.M. Eastern Daylight Time,
rickkelleyfly@gmail.com writes:
--> Yak-List message posted by: Richard Kelley <rickkelleyfly@gmail.com>
You still have the oil cooler. It has not been cleaned it may just be
residual.
Sent from my iPhone
> On May 26, 2016, at 5:09 AM, JL2A <info@flyingwarbirds.com.au> wrote:
>
> --> Yak-List message posted by: "JL2A" <info@flyingwarbirds.com.au>
>
> 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#456568
>
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
"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#456568
Message 5
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
I always wonder why we can't replace the stock oil cooler with a 300 hp cla
ss Stewart Warner style oil cooler? There is room to install it in the engi
ne cowl so we don't have to deal with replacing the long oil hoses every fe
w 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 co
st. What do you think?
On Thursday, May 26, 2016 11:15 AM, Walter Lannon <wlannon@shaw.ca> wro
te:
"Ultrasonically cleaned oil tank and cooler -------- everything is squeaky
clean"
Well, not necessarily.=C2- 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.=C2- 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.=C2- The CJ cooler is it's little brother.=C2- N
o
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'=C2- [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 see
m
at all blocked and gotta assume it is not bypassing...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456568#456568
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 6
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly |
'Overhauled' HS6A
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://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://wiki.matronics.com/>
Message 7
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| Subject: | Re: YAK 50 brakes |
Thanks Dennis,
There is lots of air from brake reducing valve. We have decided to put
on complete new brake assemblies and drums which we ordered from Doug
Sapp.
Who ever buys this airplane will have a very good airplane indeed. In
the meantime I will have excellent brakes, a vital part of a YAK 50.
Gord
> On May 22, 2016, at 11:05 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
>
> A couple of things Gordo. First you should remove the hubs and
confirm the felt grease seals are in place on the inside of the hub. If
the grease seal is broken or missing, grease from the bearings is being
"spashed" all over the brakes and the drum area. Replace the felt
grease seal. Then clean the brake pads with avgas. Let them dry. Then
scuff them up with 60 grit wet/dry sandpaper. Do this on both mains.
If you don't know where the felt grease seals are, particularly the one
on the back side of the hub, contact me off-list and I will do my best
to "point" you to it.
>
> Secondly, you may want to rebuild the brake reducing valve. I have
seen on several occasions the brake reducing valve was not outputing an
adequate amount of pressure. Doug Sapp, the CJ6 parts supplier, has the
rebuilding kits. It is 100% identical to the brake reducing valve on
the Yak 50 and 52. Doug also has the felt seals.
>
> Dennis
>
>
> From: Gordon Price <gord@thedampub.ca>
> To: yak-list@matronics.com
> Sent: Sunday, May 22, 2016 7:58 AM
> Subject: Yak-List: YAK 50 brakes
>
<mailto:gord@thedampub.ca>>
>
> I am looking for a solution to a brake problem. I cannot get enough
pressure on the brake handle to hold the aircraft during the engine
runup . The airplane creeps ahead. We tried adjusting the end of the
boden cable but that just puts the brakes on without squeezing the
handle. It seems like the pucks are slipping so maybe they need
replacement or roughing up? Any ideas?
>
> Thanks&n="http://forums.matronics.com/"
target="_blank">http://forums.matronicsef="http://wiki.matronics.com/"
target="_blank">http://wiki.matronics.c; -Matt
Dralcontribution" target="_blank">http://www.matronics.com/contribution
>
>
>
>
>
Message 8
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| Subject: | Re: 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:
bitterlich@navy.mil>
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@mat
ronics.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 cla
ss Stewart Warner style oil cooler? There is room to install it in the engi
ne cowl so we don't have to deal with replacing the long oil hoses every fe
w 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 co
st. 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.=C2- Back in the early days of NDT in the airline b
usiness we used radiography (x-ray) to confirm the internal condition of
DC-6 (R2800) oil coolers after their time on the auto flushing/shaking fixt
ure.=C2- Worked just fine for this aluminum alloy cooler as carbon, sludg
e, 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 co
pper, brass and lead.=C2- The CJ cooler is it's little brother.=C2- No
radiographic technique was found adequate and our standard procedure for ov
erhaul 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 'overh
auled'=C2- [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 outp
ut side of the engine as per CPs instructions. New oil hoses.
Ultrasonically cleaned oil tank and oil cooler. So aside from the engine, e
verything is squeaky clean.
Ran engine for 1 hour. Cut filter, flakes, but not too many. Pulled oil scr
een - 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 s
eem 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-L
ist" target="_blank">http://www.matronics.com/Navigator?p; --> <http://fo
rums.matronics.com/viewtopic.php?p=456568#456568> http:======
================== <http://forums.matro
nics.com/> http:=C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2- &nbs//www.matronics.com/contribution" target="_blank">http://w
ww.matronics.co=================
<http://wiki.matronics.com/>
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 9
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| Subject: | RE: Feedback on vendor |
For those that requested I did not receive any positive feedback regarding
this vendor.
From: Todd McCutchan [mailto:todd@fastaircraft.com]
Sent: Sunday, May 15, 2016 5:26 PM
Subject: Feedback on vendor
Has anyone done any business with Nelson Kandero out of Latvia?
Please feel free to reply to me directly.
todd@fastaircraft.com <mailto:todd@fastaircraft.com>
Thanks!
Todd
Message 10
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| Subject: | Re:Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
Yes, the filter could be by-passing, it is designed to do so when a 15psi
difference occurs. There are taps on each side of the base (in/out) that
can be attached to pressure gauges if the problem persists and if inquiring
minds Need to Know.
There is also another bypass; it is that tube running alongside the oil
cooler. Hopefully that was disassembled, cleaned and re-assembled with new
seals and a good spring. I have sent my oil cooler out to Pacific twice in
1300 hours and they did a nice job each time. It is a cost of operating
these beasts.
The flakes are coming from the inside of the engine case and gearbox case.
CJ's never really run hot enough to let modern oils warm up to where they
do the job they were designed, that is clean and then hold particulates in
suspension.
New installations require mineral based oil for the first run-in period,
whatever time that turns out to be based on the "stuff" you find in the
oil. For first runs on a "fresh" overhaul, I would use the 25 micron,
"nominal" size, rather than the 10 micron "absolute" filter. See your local
hydraulic supply or tractor store.
After pulling all the jugs off one Huosai. I used plastic scrapers inside
the case and then flushed with mineral spirits. It still took 25 hours of
flying time and two filters to get it looking a lot better.
Those screen filters assemblies also hold a lot of goop you can't see until
the system is flushed. Go back, ground run some more and check again. I
really think the best way to keep the oil clean is to go to the "gapless"
rings during OH.
Craig Payne
Message 11
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
Doing it on the YAK -50 as we speak.
Doc
Sent from my iPad
> On May 26, 2016, at 1:45 PM, Robin Hou <rmhou@yahoo.com> wrote:
>
> I always wonder why we can't replace the stock oil cooler with a 300 hp cl
ass Stewart Warner style oil cooler? There is room to install it in the engi
ne 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 ar
e 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 wan
t
> to approach airline standards.
>
> Walt
>
>
>
>
> -----Original Message-----
> From: JL2A
> Sent: Thursday, May 26, 2016 3:09 AM
> To: yak-list@matronics.com
> 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 brea
ks
> 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 engin
e,
> how does it end up on the inlet side of the engine? The filter does not se
em
> 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:==
======================http:
&nbs//www.matronics.com/contribution" target="_blank">http
://www.matronics.co=================
>
>
>
>
>
Message 12
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| Subject: | Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A |
When installing an M14R on my 50, an additional oil cooling capacity was
necessary.
The technicians at White Waltham (very knowledgeable people !) offered two
solutions: a second oil cooler within the engine cowling, or a bigger oil
cooler (from an MI-8) at the bottom.
I preferred to replace with a bigger oil cooler because the engine would
produce more heat than the M14P.
I only had to make another larger cover (with composite material).
I also kept the thermo-valve and it really helps to keep the oil temperature
at the correct settings, all the time.
Putting an oil cooler inside the cowling will demand extra precautions for
cooling.
You will disturb the flow of cooling air as it has been designed.
Other components (the air compressor for instance) could starve for cooling
air.
Jan
From: <owner-yak-list-server@matronics.com> on behalf of Roger Kemp
<f16viperdoc@me.com>
Subject: Re: Yak-List: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A
Doing it on the YAK -50 as we speak.
Doc
Sent from my iPad
On May 26, 2016, at 1:45 PM, Robin Hou <rmhou@yahoo.com> wrote:
> 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
> To: yak-list@matronics.com
> 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://forums.matronics.com/viewtopic.php?p=456568#456568>
> http:========================http:
> &nbs//www.matronics.com/contribution"
> target="_blank">http://www.matronics.co=================
>
>
>
>
>
> <http://wiki.matronics.com/>
> <http://forums.matronics.com/>
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