video after video of very high quality content. great photography, clear explanations, unique opportunities to see fantastic engineering. Fantastic. Thank you.
I had NO IDEA how mechanically "straightforward" a jet engine was. It's extremely logical and far easier to understand in its principle than I ever imagined ... THANKS ENTIRELY TO YOU!
as a pilot in training, this is absolutely priceless information. the more we know about the systems that keep us in the air the better. Amazingly useful video!
I'm no engineer, but I've wondered how turbine bearings and seals worked since I was a teenager. I've no idea why this always fascinated me, but this video provides answers that I could never find in the last 20+ years. Thanks.
This was the first AgentJayZ video I stumbled upon. Since then, I've been compelled to watch the remaining 230 videos (even the really long one on blending). Keep 'em coming!
Outstanding editing on this video. Great diagrams, and crystal clear explanations! Thank you for taking the time to put this together. It was really informative, and I enjoyed every moment of it.
Excellent presentation. I don't have any connections with gas turbine engines but I was fascinated to see this and so impressed with the quality of engineering. Thank you.
All of your videos are great but this one is exceptional. You did such a great job of explaining the concept and following it through with the actual functioning parts. Thank you for the effort, it made this video a great educational treat.
I worked for TMT Research where I machined the pockets on similar oil pumps and fuel pumps. Was fascinating work! We received the various housings bare and ready for refurbishing. It was nice to see the actual assembly. Thank you!
I am an automotive transmission tech and especially in the lubrication system there are similarities i.e. the pumps, orifices, thrust bearings ect. Also the converters have turbines and a stator. You are a wonderful teacher. Thank you
Bravo! Bravo! Bravo! Great explanation of jet engine oil systems! One other neat thing you might want to show the audience one day is the magnetic detection plug typically found at the very bottom of the gearbox. Simple device that detects any large pieces of metal that may float around the oil system. Early indication of a component failure in the engine. Again great video! All the best!
Very good explained how the oil system of a jet engine works. Lot of things that I didn't know, and do know now! Thank you for sharing and keep up the good work!
Jay, so well done, again and again. Every video you make. You remind me of the very best teachers I had in college when I took electronics. Thanks so much for your effort.
this is an awesome video for the Oil & LUBE portion of Aviation Maintenance. I grad from Rock Valley College Aviation Maintenance Technology A&P program. I don't think my instructor explained as good as you did in this video. Thank you for sharing!!!!
Hey, thanks for the info. As you can see, there is a real hunger for knowledge about jet engines. The engines I work with are based on older aviation designs that are no longer flying. We need to hear more from guys like you who are working with the modern stuff.
OK Jay, I just reviewed this video, liked it & am commenting on it. A gas turbine lube system is for cooling most of all, with lubing & 'flushing' under that. A GSX-R engine makes lubrication for sliding surfaces a priority over cooling. Even an all roller/ball bearing 2-stroke piston engine has lots of sliding surfaces! Thanks again for the education. Regards, Darren
I know for a fact your an excellent mechanic. watched a lot of your videos. But Im sure you missed your calling as an even better teacher. The way you explain and show things you could make a jet/turbine engine mechanic out of a 2nd grader. Why there would be 33 dislikes for this video is way beyond me. And ditto to what Chris Wesley said below. Well done....
Another slick video to help us get our bearings! Jet oil system is cool indeed! Seriously you put a lot of work into this. I especially like the intro about the purposes of oil. That set the smooth roll out of the rest. I also enjoy reading your smart-ass replies to stupid questions that people leave. Your teaching style comes across as genuine in the video, not talking down to be people but being clear. However, turn the burners on the arrogant trolls!
Well this is one of a kind channel. I have been watching these videos for a long time now and they sure are right kind of joy for mechanical engineer who is also into aviation :)
Fantastic video. I’m a newer R&D industrial gas turbine test engineer and love learning from your informative videos. Thank you for so much great content.
You are an absolute legend, this video helped me get a distinction in my lubricants and lubrication systems assignment in level 3 mechanical engineering, thanks so much Jay!
Thanks for the video,I live near an airport and hear them all the time. When I was younger I hauled a lot of J79s ,never new how they worked. Thanks for the education.
Thanks for the detailed explanations. One little nit: One cannot say that reduction of friction is less important than the other functions of the oil. A ball bearing has mainly rolling friction (between the balls and the inner and outer ring) and a bit of sliding friction (between balls and the cage that keeps them apart from each other. And that friction produces the heat and the particles the oil carries away. Secondly the oil is essential for the lifetime of the bearing because it gets pulled in between the balls and the rings. This prevents direct contact between the moving parts, drastically reduces friction and wear and tear. If rotation speed and oil viscosity at operation temperature are right then a thin film of oil performs that functions.
Outstanding job. I'm working on a heat exchanger for a lube-oil system at work and this was extremely helpful to my effort. Great detail and explanation. Thanks
Interesting video. Very much same route used by every racing engine builder on dry sump engines. Oil pump works exactly same, we have 2,3,4,5 and sometimes 6 scavenge ports. Typically on a racing engine (NASCAR, F1, IMSA) the oil is filtered after it comes out of the engine. This is to lessen the contamination to the rest of the system if the engine has an issue. Plus oil is warmer after it leaves the engine and takes less HP to move through the system. We have run engines with filters on both sides of the pump (in and out) with no issues. We have oilers spraying on the pistons to cool them. But I'm sure if you have an major engine issue, everything gets clogged with engine bits, same as we do, and its pretty much junk after that. Always cool to see other folks designs, ideas.
Great video. It brings back memories of running the heated oil through the nozzles at a specific pressure and temperature to verify their flow rate. This was mostly on JT 8s and 9s at PW&W in the late 70s. I worked there doing assembly.
Man you have a great amount of knowledge and I thank you for sharing it with You Tube for all of us to see and learn, I still am quite amazed at just how much power a jet engine produces for the amount of weight that is has.
@deSloleye The operational maintenance guys would do oil filter changes, water wash the compressor, monitor the vibration trends, and keep an eye out for any leaks. Usually any time the engine is shut down for a boroscope inspection, the work is carried out by turbine people. The millwrights and mechanics who keep a plant running usually draw a line around the turbine engines, and prefer to let us cross it. Usually.
The reservoir is pressurized because at high altitudes there is not enough pressure to feed the pumps and Fuel/Oil coolers are used to prevent Jet fuel icing up since it likes to suspend water....and helps cool the oil of course hehe. Thanks for the videos
Hmmm.... really good question! The oil pressure in most jets is generally lower than in a journal bearing engine, mainly because the oil jets orifices are huge to enable the large flows needed for the oil to act as a coolant. They are all different, but lets say they average about 30 to 40 psi. The fuel-cooled oil cooler does not circulate fuel at fuel pump pressure, but it uses fuel tank boost pump pressure on its way to the fuel pump. That is typically 25 - 40 psi.
Wow, interesting channel, with great explanation. It's everything I wanted to know about the complexity of the turbine engine lubrication system 19:14 demonstrates perfectly how important to have the balls and shaft well sprayed with oil from multiple orifices. I bet more so when there is thrust involved. Bravo!
I worked for a company in Smith River that poor s epoxy repairs on engine oil pumps. I’ve mentioned them before, TMT Research Development. These things are amazing! Especially the hight-tolerance fuel pumps.
Each engine has a different nominal oil pressure, and a few engines have pressure regulators. Otherwise, the oil pressure is dependent on pump speed, which depends on engine rpm.Most engines run at lower oil pressure than a car, because the system is designed for high flow. As mentioned in the video, the primary function of the oil in a jet engine is as a coolant.
As a fine point about rolling bearings: they do actually involve a bit of friction. If they made perfect point contact (for ball bearings) or line contact (for roller bearings), they'd be frictionless, but when loaded that point contact expands to a contact patch, only the center of which is truly rolling; the rest is doing a wee bit of sliding. I know from your other videos how little effort it takes to spin a jet engine by hand, but under operating loads the friction won't be quite so low.
...an answer I gave to this same question a few months ago: "Some engines have an upper and lower scavenge line to each main bearing, and also a weighted, pivoting oil pickup in the reservoir. The gearbox might fill with oil after a couple minutes of inverted flight, and that would leave less oil for circulation. It would take a minute or so to recover, flying right side up. I don't think military pilots have much use for negative G, or sustained inverted flight. "
Fascinating video, thank you for making it, I learned a lot about gas turbine lubrication. I work a lot on piston engines but would love to work on turbines!
Sir , Thank you so much for your precised and explanatory videos, so clearly shows how all parts of a jet engine work. I enjoy every minute of your videos. Thank you again. Leon Tz
I think you are talking about a very special type of pump called the progressive cavity... A strange device which closely resembles an archimedean screw. The PC pump is used to pump crude oil up from low pressure wells, and has also been used to move products like cherries without damaging them. I call it strange, because it is considered a positive displacement pump, yet it contains no actual enclosed chambers.
Hi - Not sure what you work on (although I proably have worked on it as well), but a few points: Newer engines are not really ditching Air Cooled Oil Coolers (ACOC's) or Fuel Cooled Oil Coolers (FCOC's) as they are a key component of the the engines (and airframes) heat management system. Mostly, FCOC's provide heating effects to engine fuel in the wing tanks etc through a means of re-circulation. Questions? I am a Technical Services Engineer with an OEM = I live this stuff daily. Ask away!
Thank you for your explanations. I'm studying now the engine lubrication T 56 A-15 Hercules aircraft (Loockeed) and CFM-56 (Airbus). Saludos desde Zaragoza (España).
The boost pump pressure would not really change with increasing fuel consumption of the engine, because the boost pumps move far more fuel than the engine can use, and they are non-positive displacement pumps. As far as oil dilution, it is not as serious as you might think, because all bearings in jet engines are ball- or roller-element. There are no journal bearings anywhere. Which way would a leak go? Don't know, but the oil coolers are extremely well made, all welded up in stainless steel.
i am really thankful for this video. This clearly explains the Lube System and bearing system as well in full depth. The real part visualization helps a lot to understand things in less amount of time. In addition to what you have shown in this video, can you please make a video which will show different sumps of an engine ? (e.g. A sump, B-sump, etc). It would be really helpful to understand the whole lube system and bearing system. again thanks a lot for this Video and many other videos as well on this beautiful channel. Regards, Nachiket from India
I did explain what a sump is and how it is constructed. You can't really show one, because it is an enclosed, empty space. Usually starting from the front of the engine, A would be the first one, B would be the next one, and C... well hopefully you get the picture.
Thanks for the video. I do understand that is difficult to showcase the sump, but had to ask in case you had anything to show :)> Do you have a GE90 engine being shown in one of your videos or you are planning to showcase in one the upcoming videos? Please let me know, i am looking forward to understand GE90 engine in depth. Again Cheers for your high quality content and videos! Thanks Nachiket
I am amazed at the wide area and the depth of knowledge of this gentleman, In addition to that he has a great mastery of the language and such diverse vocabulary to explain every detail without hesitation to achieve the best Knowledge Transfer I have ever seem, He seeks his own knowledge and does not need any teachers, His sense of observation is brilliant. He has a good sense of humour at the right time, I wish my students were all like him, it would make my life so much easier, He would make an excellent University lecturer, He has an ability to guarantee what he does and does not hides behind, just research, He is so confident of himself. I have some colleagues who work on the fuel systems of helicopters and they do worry much about their work as it is a very responsible job indeed when there are lives at stage, This gentle seem to take it all in his stride.......... a great experience behind all this, Congratulations and good fortune,
@NMTbaron08 Rain has such a tiny effect on anything it is totally disregarded. You could run a firehose into the intake, and the engine would run cooler, create a bit of black smoke, make less NOx pollutants, and make a bit more power. Back in the day, in addition to the use of afterburners, many military aircraft boosted the thrust of their turbojets with water injection.
AgentJayZ What I enjoyed so much here is that you picked one aspect (oil as cooling), and followed that through end-to-end through the entire system. And to do that, you used whatever media seemed most relevant for each part through the tour. That worked really well! Also great that you gave a few examples of the alternative implementations of the same general concept, where different manufacturers do things slightly differently - and moreso how you didn't bother showing us where each manufacturer does things in the same way. That's exactly the right ratio of conceptual stuff to concrete implementation specifics. That's a really happy niche, where you serve to bridge the space between general whiteboard diagrams and a particular company's product, and it was a pleasure to listen to.
there are several sources, including new manufactured from old blueprints. NOS bearings cost what the supplier is asking, and what the market will bear. The price of a nice used car is a good ballpark figure.
Jay, I am currently listening to "Working Man" by Rush on Sirius/XM "Deep Tracks" (Ch. 27) & immediately thought of you! Canadian band, Canadian Jet Tech! Thanks again! :) Darren
The lube system in an aircraft turbine engine can be used to detect impending bearing failures before something really bad happens. When a bearing is wearing out and approaching the failure point it will begin dumping more and more metal into the oil. By periodically taking a sample of oil from the engine and burning it in a spectrum analyzer to see what color light is given off and how much, the presence of the excessive metal in the oil can be detected. Sometimes you can even determine which bearing is failing because the analyzer will tell you which metal or metals are present in the oil. This can sometimes identify a specific bearing.
islam elnasharty In Australian civil aviation the standard practice is to have the oil analyzed by a specialist oil laboratory. A full spectral analysis of the oil is given and a specialist engineer writes an indicative report of engine wear and performance. Often this service is provided by Mobil Oil. Independent analysis of the oil is superior for legal reasons in the event of any failure
If i am not mistaken (software developper here,no real aviation experience whatsoever),there is a component called a fuzz buster. Its a bolt with a powerful magnet and two electrical contacts,fitted in the oil sump. WHen the buildup of metallic particles acumulate on the contacts,it causes a short and a warning light to light up. The pilot can try to bust the fuzz wth an electrical discharge,but if the short persists,it means the bearings are really worn out.
jeetendrag10acc2 It's not a bad idea. But I think spectrum oil analysis can detect tiny amounts of metal in the few parts per million range. It can also do trends, which a simple sensor like your describing couldn't do. Remember the objective here is to detect trouble well before the bearing seizes and the engine fails. The airplanes I worked on were F-100s. They had only one engine. You had to know if trouble was coming well in advance.
This channel is helping me a lot for my pilot licence exams, this is amazing 🤩❣️
video after video of very high quality content. great photography, clear explanations, unique opportunities to see fantastic engineering. Fantastic. Thank you.
Chris Wesley give adrass
Why?
I had NO IDEA how mechanically "straightforward" a jet engine was. It's extremely logical and far easier to understand in its principle than I ever imagined ... THANKS ENTIRELY TO YOU!
nice to see a channel in which not a single video contains ads
as a pilot in training, this is absolutely priceless information. the more we know about the systems that keep us in the air the better. Amazingly useful video!
I'm no engineer, but I've wondered how turbine bearings and seals worked since I was a teenager. I've no idea why this always fascinated me, but this video provides answers that I could never find in the last 20+ years. Thanks.
This was the first AgentJayZ video I stumbled upon. Since then, I've been compelled to watch the remaining 230 videos (even the really long one on blending). Keep 'em coming!
Outstanding editing on this video. Great diagrams, and crystal clear explanations! Thank you for taking the time to put this together. It was really informative, and I enjoyed every moment of it.
There is something incredibly satisfying about components fitting together with such precision.
All the bearings I use in my demo videos like this have already been scrapped, so we can fondle them as we desire...
Excellent presentation. I don't have any connections with gas turbine engines but I was fascinated to see this and so impressed with the quality of engineering. Thank you.
The love of turbine engines and there components, displayed into words another fantastic video
thanks
All of your videos are great but this one is exceptional. You did such a great job of explaining the concept and following it through with the actual functioning parts. Thank you for the effort, it made this video a great educational treat.
I worked for TMT Research where I machined the pockets on similar oil pumps and fuel pumps. Was fascinating work!
We received the various housings bare and ready for refurbishing. It was nice to see the actual assembly.
Thank you!
I am an automotive transmission tech and especially in the lubrication system there are similarities i.e. the pumps, orifices, thrust bearings ect. Also the converters have turbines and a stator. You are a wonderful teacher. Thank you
I'm a aviation maintenance student and I found your video very helpful.
Bravo! Bravo! Bravo! Great explanation of jet engine oil systems! One other neat thing you might want to show the audience one day is the magnetic detection plug typically found at the very bottom of the gearbox. Simple device that detects any large pieces of metal that may float around the oil system. Early indication of a component failure in the engine.
Again great video! All the best!
Very good explained how the oil system of a jet engine works. Lot of things that I didn't know, and do know now! Thank you for sharing and keep up the good work!
Jay, so well done, again and again. Every video you make. You remind me of the very best teachers I had in college when I took electronics. Thanks so much for your effort.
I really appreciate you maxing your videos well indexed and easily searchable!
this is an awesome video for the Oil & LUBE portion of Aviation Maintenance. I grad from Rock Valley College Aviation Maintenance Technology A&P program. I don't think my instructor explained as good as you did in this video. Thank you for sharing!!!!
Hey, thanks for the info. As you can see, there is a real hunger for knowledge about jet engines. The engines I work with are based on older aviation designs that are no longer flying. We need to hear more from guys like you who are working with the modern stuff.
OK Jay,
I just reviewed this video, liked it & am commenting on it. A gas turbine lube system is for cooling most of all, with lubing & 'flushing' under that. A GSX-R engine makes lubrication for sliding surfaces a priority over cooling. Even an all roller/ball bearing 2-stroke piston engine has lots of sliding surfaces! Thanks again for the education.
Regards,
Darren
I know for a fact your an excellent mechanic. watched a lot of your videos. But Im sure you missed your calling as an even better teacher. The way you explain and show things you could make a jet/turbine engine mechanic out of a 2nd grader. Why there would be 33 dislikes for this video is way beyond me. And ditto to what Chris Wesley said below. Well done....
Another slick video to help us get our bearings! Jet oil system is cool indeed!
Seriously you put a lot of work into this. I especially like the intro about the purposes of oil. That set the smooth roll out of the rest. I also enjoy reading your smart-ass replies to stupid questions that people leave. Your teaching style comes across as genuine in the video, not talking down to be people but being clear. However, turn the burners on the arrogant trolls!
I'm so glad this channel exists. This is so incredibly fascinating.
Well this is one of a kind channel. I have been watching these videos for a long time now and they sure are right kind of joy for mechanical engineer who is also into aviation :)
Excellent overview of the lubrication system. Thank you for taking the time to put these presentations together. Very educational.
thanks so much! What an awesome channel. I am a computer programmer from ZA, and I have no idea why I find your videos so fascinating. Best wishes! K
Fantastic video. I’m a newer R&D industrial gas turbine test engineer and love learning from your informative videos. Thank you for so much great content.
You are an absolute legend, this video helped me get a distinction in my lubricants and lubrication systems assignment in level 3 mechanical engineering, thanks so much Jay!
Exxxxcellent !
Now... let's discuss the matter of my fee...
Hahahahaa! I could pay you 2 Canadian dollars, that's all I have here in the UK in your currency!
Thanks for taking the time out of your day to explain all of this to us, I have always been fascinated by jet turbine engines.
Thanks for the video,I live near an airport and hear them all the time. When I was younger I hauled a lot of J79s ,never new how they worked. Thanks for the education.
Thanks for the detailed explanations. One little nit: One cannot say that reduction of friction is less important than the other functions of the oil. A ball bearing has mainly rolling friction (between the balls and the inner and outer ring) and a bit of sliding friction (between balls and the cage that keeps them apart from each other. And that friction produces the heat and the particles the oil carries away. Secondly the oil is essential for the lifetime of the bearing because it gets pulled in between the balls and the rings. This prevents direct contact between the moving parts, drastically reduces friction and wear and tear. If rotation speed and oil viscosity at operation temperature are right then a thin film of oil performs that functions.
Did I say it was actually less important? If so, nit accepted.
Outstanding job. I'm working on a heat exchanger for a lube-oil system at work and this was extremely helpful to my effort. Great detail and explanation. Thanks
Interesting video. Very much same route used by every racing engine builder on dry sump engines. Oil pump works exactly same, we have 2,3,4,5 and sometimes 6 scavenge ports.
Typically on a racing engine (NASCAR, F1, IMSA) the oil is filtered after it comes out of the engine. This is to lessen the contamination to the rest of the system if the engine has an issue. Plus oil is warmer after it leaves the engine and takes less HP to move through the system. We have run engines with filters on both sides of the pump (in and out) with no issues. We have oilers spraying on the pistons to cool them. But I'm sure if you have an major engine issue, everything gets clogged with engine bits, same as we do, and its pretty much junk after that. Always cool to see other folks designs, ideas.
Maybe you know this: when was dry sump lubrication introduced for automotive racing piston engines?
@@AgentJayZ mid to late 70’s I believe for NASCAR, early 70’s for F1, not sure on other series
Great video. It brings back memories of running the heated oil through the nozzles at a specific pressure and temperature to verify their flow rate. This was mostly on JT 8s and 9s at PW&W in the late 70s. I worked there doing assembly.
Well done, sir. Clear, concise, lucid.
Thank you!
@lexichronicle2 This one took weeks, but only because I get shots as the opportunity arises.
Always nice to hear you like them !
Man, I almost didn't watch this one, turned out to be the most informative. Awesome videos man!
Thank your for all your efford, we're feeling all components and systems with your mentions.
Man you have a great amount of knowledge and I thank you for sharing it with You Tube for all of us to see and learn, I still am quite amazed at just how much power a jet engine produces for the amount of weight that is has.
I'm liking the mug... A real aeroplane with proper turbojets! :) nice vid too, very well explained.
Wow! The wet side of a turbine is revealed to me!
Thank you for this ray of knowledge, visible for people like me :)
Waiting for more.
OMG, i was interested in the oil system of a jet engine since i was 10 yrs old :) and this, this is a very very nice overview. Thanks!
@deSloleye The operational maintenance guys would do oil filter changes, water wash the compressor, monitor the vibration trends, and keep an eye out for any leaks.
Usually any time the engine is shut down for a boroscope inspection, the work is carried out by turbine people.
The millwrights and mechanics who keep a plant running usually draw a line around the turbine engines, and prefer to let us cross it.
Usually.
Thanks for the video it really helped me understand how the lubrication system works. The way you present everything is great!
Excellent explanation, can really see your knowledge. You explain everything in such Laman terms. I could watch this stuff all day.
The reservoir is pressurized because at high altitudes there is not enough pressure to feed the pumps and Fuel/Oil coolers are used to prevent Jet fuel icing up since it likes to suspend water....and helps cool the oil of course hehe. Thanks for the videos
Hmmm.... really good question! The oil pressure in most jets is generally lower than in a journal bearing engine, mainly because the oil jets orifices are huge to enable the large flows needed for the oil to act as a coolant.
They are all different, but lets say they average about 30 to 40 psi.
The fuel-cooled oil cooler does not circulate fuel at fuel pump pressure, but it uses fuel tank boost pump pressure on its way to the fuel pump. That is typically 25 - 40 psi.
thank you sir for your incredible time and effort in making these videos very educational
Wow, interesting channel, with great explanation. It's everything I wanted to know about the complexity of the turbine engine lubrication system 19:14 demonstrates perfectly how important to have the balls and shaft well sprayed with oil from multiple orifices. I bet more so when there is thrust involved. Bravo!
The primary function of a lubricant first is that of a coolant! I am your humble no 1 fan fantastic vedios!
shit...my usual bath just got 23minutes and 06 seconds extra...its addictive..thank you(greetings from Romania)
you are the greatest man on youtube
This is a great video! Love to the format in which you present the info.
I worked for a company in Smith River that poor s epoxy repairs on engine oil pumps. I’ve mentioned them before, TMT Research Development.
These things are amazing! Especially the hight-tolerance fuel pumps.
Yes, absolutely. The total engine mass should be under 100 mg. Anything larger, and you will need more viscosity.
simply too good for any engineer to understand. Thanks Amaresh Sastry
These are incredibly informative videos. Thanks so much!
Very informative vedio👌👌👌👍👍👍
Each engine has a different nominal oil pressure, and a few engines have pressure regulators. Otherwise, the oil pressure is dependent on pump speed, which depends on engine rpm.Most engines run at lower oil pressure than a car, because the system is designed for high flow. As mentioned in the video, the primary function of the oil in a jet engine is as a coolant.
amazing explanation really cool video to understand engine oil system
As a fine point about rolling bearings: they do actually involve a bit of friction. If they made perfect point contact (for ball bearings) or line contact (for roller bearings), they'd be frictionless, but when loaded that point contact expands to a contact patch, only the center of which is truly rolling; the rest is doing a wee bit of sliding. I know from your other videos how little effort it takes to spin a jet engine by hand, but under operating loads the friction won't be quite so low.
Excellent explanation. Thank you.
Amazing! Your video explains this complex subject so very well and clearly.
thanks for your time to show all that. VERY OUT STANDING
Guys like you make TH-cam great! Thank you!!
...an answer I gave to this same question a few months ago:
"Some engines have an upper and lower scavenge line to each main bearing, and also a weighted, pivoting oil pickup in the reservoir. The gearbox might fill with oil after a couple minutes of inverted flight, and that would leave less oil for circulation.
It would take a minute or so to recover, flying right side up.
I don't think military pilots have much use for negative G, or sustained inverted flight.
"
Hats Off Sir, you are a great instructor!!!
Fascinating video, thank you for making it, I learned a lot about gas turbine lubrication. I work a lot on piston engines but would love to work on turbines!
Sir , Thank you so much for your precised and explanatory videos, so clearly shows how all parts of a jet engine work. I enjoy every minute of your videos.
Thank you again.
Leon Tz
Mr j z., thank you.i wish my my instructor.could be at least half as good as you to explain things.
Good description of jet engine lube system. Thank you.
I think you are talking about a very special type of pump called the progressive cavity... A strange device which closely resembles an archimedean screw. The PC pump is used to pump crude oil up from low pressure wells, and has also been used to move products like cherries without damaging them.
I call it strange, because it is considered a positive displacement pump, yet it contains no actual enclosed chambers.
brother, your videos are really really informative and helpful! keep up the good work! #Malaysia
Thanks for this video agent Jay, to a student, as myself, helps a lot the explained details!
That's a wicked looking axial radial bearing. Wishing I worked in the jet industry.
Hi - Not sure what you work on (although I proably have worked on it as well), but a few points: Newer engines are not really ditching Air Cooled Oil Coolers (ACOC's) or Fuel Cooled Oil Coolers (FCOC's) as they are a key component of the the engines (and airframes) heat management system. Mostly, FCOC's provide heating effects to engine fuel in the wing tanks etc through a means of re-circulation. Questions? I am a Technical Services Engineer with an OEM = I live this stuff daily. Ask away!
This video was very helpful in prepping for a brief on my aircraft's (T-6B) oil system! Thanks and Semper Fi.
Very interesting and well presented, as usual.
Thank you for your explanations. I'm studying now the engine lubrication T 56 A-15 Hercules aircraft (Loockeed) and CFM-56 (Airbus).
Saludos desde Zaragoza (España).
The boost pump pressure would not really change with increasing fuel consumption of the engine, because the boost pumps move far more fuel than the engine can use, and they are non-positive displacement pumps.
As far as oil dilution, it is not as serious as you might think, because all bearings in jet engines are ball- or roller-element. There are no journal bearings anywhere.
Which way would a leak go?
Don't know, but the oil coolers are extremely well made, all welded up in stainless steel.
Wow, another REALLY interesting video - many thanks for such great work!
Gear rotary pumps. Beautiful. Thanks for such awesomeness
Fantastic explanation. Thank you so much for making this.
Thank you for an excellent presentation on a turbine engine lubrication system. I just found your channel and
i am really thankful for this video. This clearly explains the Lube System and bearing system as well in full depth. The real part visualization helps a lot to understand things in less amount of time. In addition to what you have shown in this video, can you please make a video which will show different sumps of an engine ? (e.g. A sump, B-sump, etc). It would be really helpful to understand the whole lube system and bearing system.
again thanks a lot for this Video and many other videos as well on this beautiful channel.
Regards,
Nachiket from India
I did explain what a sump is and how it is constructed. You can't really show one, because it is an enclosed, empty space.
Usually starting from the front of the engine, A would be the first one, B would be the next one, and C... well hopefully you get the picture.
Thanks for the video. I do understand that is difficult to showcase the sump, but had to ask in case you had anything to show :)>
Do you have a GE90 engine being shown in one of your videos or you are planning to showcase in one the upcoming videos?
Please let me know, i am looking forward to understand GE90 engine in depth.
Again Cheers for your high quality content and videos!
Thanks
Nachiket
I am amazed at the wide area and the depth of knowledge of this gentleman, In addition to that he has a great mastery of the language and such diverse vocabulary to explain every detail without hesitation to achieve the best Knowledge Transfer I have ever seem, He seeks his own knowledge and does not need any teachers, His sense of observation is brilliant. He has a good sense of humour at the right time, I wish my students were all like him, it would make my life so much easier, He would make an excellent University lecturer,
He has an ability to guarantee what he does and does not hides behind, just research, He is so confident of himself.
I have some colleagues who work on the fuel systems of helicopters and they do worry much about their work as it is a very responsible job indeed when there are lives at stage, This gentle seem to take it all in his stride.......... a great experience behind all this, Congratulations and good fortune,
@NMTbaron08 Rain has such a tiny effect on anything it is totally disregarded.
You could run a firehose into the intake, and the engine would run cooler, create a bit of black smoke, make less NOx pollutants, and make a bit more power.
Back in the day, in addition to the use of afterburners, many military aircraft boosted the thrust of their turbojets with water injection.
very good explanation of the oil system
Thanks for taking your time to share your knowledge
This video was amazing! Jam packed with stuff. Thanks :D
+katelikesrectangles I always thought you'd seen this one in the first days after its release. Glad you like!
AgentJayZ What I enjoyed so much here is that you picked one aspect (oil as cooling), and followed that through end-to-end through the entire system. And to do that, you used whatever media seemed most relevant for each part through the tour. That worked really well!
Also great that you gave a few examples of the alternative implementations of the same general concept, where different manufacturers do things slightly differently - and moreso how you didn't bother showing us where each manufacturer does things in the same way. That's exactly the right ratio of conceptual stuff to concrete implementation specifics.
That's a really happy niche, where you serve to bridge the space between general whiteboard diagrams and a particular company's product, and it was a pleasure to listen to.
there are several sources, including new manufactured from old blueprints. NOS bearings cost what the supplier is asking, and what the market will bear. The price of a nice used car is a good ballpark figure.
Spectacular! Thank you for sharing - and showing! - on real equipment.
Thanks a lot for all these details !
Thanks, Very useful information and learning source.
Excellent work, tha.nks a lot for your video, it helps me a lot
Great video, great diagrams ! Thanks !
Jay,
I am currently listening to "Working Man" by Rush on Sirius/XM "Deep Tracks" (Ch. 27) & immediately thought of you! Canadian band, Canadian Jet Tech! Thanks again! :)
Darren
The lube system in an aircraft turbine engine can be used to detect impending bearing failures before something really bad happens. When a bearing is wearing out and approaching the failure point it will begin dumping more and more metal into the oil. By periodically taking a sample of oil from the engine and burning it in a spectrum analyzer to see what color light is given off and how much, the presence of the excessive metal in the oil can be detected. Sometimes you can even determine which bearing is failing because the analyzer will tell you which metal or metals are present in the oil. This can sometimes identify a specific bearing.
the easier way to build a sensor for wear metals but where can it be fitted!
islam elnasharty
In Australian civil aviation the standard practice is to have the oil analyzed by a specialist oil laboratory. A full spectral analysis of the oil is given and a specialist engineer writes an indicative report of engine wear and performance. Often this service is provided by Mobil Oil. Independent analysis of the oil is superior for legal reasons in the event of any failure
If i am not mistaken (software developper here,no real aviation experience whatsoever),there is a component called a fuzz buster. Its a bolt with a powerful magnet and two electrical contacts,fitted in the oil sump. WHen the buildup of metallic particles acumulate on the contacts,it causes a short and a warning light to light up. The pilot can try to bust the fuzz wth an electrical discharge,but if the short persists,it means the bearings are really worn out.
jeetendrag10acc2
It's not a bad idea. But I think spectrum oil analysis can detect tiny amounts of metal in the few parts per million range. It can also do trends, which a simple sensor like your describing couldn't do. Remember the objective here is to detect trouble well before the bearing seizes and the engine fails. The airplanes I worked on were F-100s. They had only one engine. You had to know if trouble was coming well in advance.