---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Fri 05/27/16: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 04:43:01 AM PST US Subject: Yak-List: Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A From: "JL2A" 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 _____________________________________ Time: 09:44:10 AM PST US Subject: Re: Yak-List: Re: Oil Sludge, Carbon Flakes, Freshly 'Overhauled' HS6A From: doug sapp 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 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 _____________________________________ Time: 10:48:02 AM PST US From: "Bitterlich, Mark G CIV NAVAIR, WD" Subject: RE: [Non-DoD Source] Re: Yak-List: 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" 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 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:======================== http: &nbs//www.matronics.com/contribution" target="_blank">http://www.matronics.co================== http://forums.matronics.com http://wiki.matronics.com ________________________________ Message 4 _____________________________________ Time: 01:54:24 PM PST US Subject: Yak-List: for sale - AN-12 ball valve From: "formerYakowner" 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 Attachments: http://forums.matronics.com//files/img_3102_495.jpg http://forums.matronics.com//files/img_3101_181.jpg ________________________________ Message 5 _____________________________________ Time: 02:01:19 PM PST US Subject: Yak-List: FOR SALE - Timing tools From: "formerYakowner" 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 Attachments: http://forums.matronics.com//files/img_3086_570.jpg http://forums.matronics.com//files/img_3089_124.jpg http://forums.matronics.com//files/img_3087_174.jpg http://forums.matronics.com//files/img_3085_158.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.