Cylinder inspection video repaired slide
Vložit
- čas přidán 5. 07. 2024
- This is my cylinder inspection presentation that I made for the ABS tent topic at Oshkosh 2018. This version has the repaired audio and video slide at approx 29:29. I can be reached at Pasquale Aviation, airdave@ptd.net , or search for Pasquale Aviation on Facebook
This is a next-level deep dive into exhaust valve analysis and remediation. In the past, this kind of understanding has been largely missing in the aviation maintenance community. I’ll second the other requests for a detailed valve lapping video. Keep up the great work Dave.
Great video. Thank for creating and posting this.
Thanks for sharing this with us a really informative real life check
Awesome videos - very educational info about the valve rotators and great idea about organizing the inspection. Thank you Dave.!!!
Super informative Dave, thank you for putting this all together.
Awesome!!! Very informative video. Thank You
Great job, Dave. Excellent video with lots of information. Thank you so much for doing this.
Thanks for a great video, as an owner I use my borescope when I have plugs pulled, but my A&P isn’t used to seeing things on camera and this video will help us to determine “normal” and “problem” when viewing our photos. Very well done! Thank you
Thank you Dave for such an informative video. I do most of my maintenance with an IA. I have the boroscope you show and use it to scope the cylinders about twice a year. I never thought of looking at the cam. I will do that too. So thank you again for all the great info.
Awesome presentation! Used it as a guide going through my annual.
Awesome! I'm glad you found the video helpful.
Wow, the presentation was super helpful, especially for me as a new aircraft owner (Cessna R172K). Ordered one of those borescopes on Amazon today.
Video popped up on CZcams 11/19, perfect timing for our annual. Pulling 2 cylinders because of low compression and hot spot on exhaust valves. Your video will help when we talk to the shop about possible actions!
Even if you aren't comfortable with lapping valves regular bore scope inspections will allow you to plan a cylinder replacement. I've done this with several clients.
AWESOME presentation! The detail, the knowledge, etc. Very impressed.
Thank you!
@@AirDavePasqualeAviation oil mix 1:33 is ok ?
Great help Dave for me a new A&P with little knowledge on what I am seeing. It will take practice but this film is a great starter lesson. I would like to see one on the proper way to lap valves. Thanks for the great lesson!
I hope to make a video on lapping valves soon.
Excellent video Dave. I learned a lot.
Thank you!
Pasquale good job
A really fantastic presentation.
Thank you for sharing your knowledge.
Thank you!
Fantastic video. My Lyc IO 540 displays some cylinder corrosion, some oil on intake valve stem. All normal patterns on exhaust valves. Uses 1 qt of oil per 8hrs. Good compression. I was concerned about the oil and corrosion. But your analysis to continue to monitor and operate as normal gives me quite a bit of confidence in my engine and my mechanic. Thank you!
Good information and presentation.
This is the best ever seen video of engine maintenance... Thank You, and Congratz !
Great Presentation. Thank you!
Dave, I really appreciate this excellent video. Thank you. I have had my mechanic scope my cylinders at every annual since that became an option. Unfortunately his scope doesn’t record photos. After watching your video, I purchased the latest Vividia VA400 v5 with a WiFi box attached last week (directly from them to get the latest version per a comment on BT) so I can maintain a sequential photographic record of my cylinders. Oasis should have you on the payroll….My only comment on the scope is their software is a PIA to record to a late model iPhone and iPad and I couldn’t get it to talk to my win10 laptop as you managed to do. The shutter button on the scope isn’t functional, but the on/off button on the WiFi transmitter worked as a shutter. The scope is easy to maneuver and the images are excellent. Unfortunately when I attempted to select all the photos in the wifiImage apps folder to move them…they vanished. Before my next annual, I need an app for Win 10.
I didn't like their software and do not use it. On my Windows 10 laptop plugging the scope directly into the usb port makes it function like a web cam. I use the camera app that comes with Windows to capture photos and videos. It works well. Photos and videos are stored in the camera roll. I transfer them from there to aircraft specific folders on a different hard drive.
Thank You for making this Video. I thought I was going to have to pull # 5 Cylinder, but after watching your video, I am going to try having the vales lapped and replace rotator and vlve springs. lapping
That's excellent. Thank you for the comment!
Excellent Video Dave , very educational
Thank you for the presentation, it was very informative.
Great video and thank you for sharing your knowledge.... a&p but still learning
Thanks! i just top overhauled my o-470. great information.
Wonderful video sir. Thank you!
It was amazing. Thank you very much...
Professor Dave, where have you been all my life? You have set a new standard, collegiate level information. I wish this was available decades ago. And seriously, please, please do the valve lapping video. Also....how did you aim the scope to get up and behind the valve to look at the stem. (I have been practicing with my Vividia, but..???) This video should be required viewing for one's A&P!!!!
Outstanding.
Thank you Dave, excellent video. Any chance of a video on exhaust valve lapping?
wow great video thanks for sharing this with the world
Super video.
Most amazing video...
Thanks for your informative video. I'm flying a Sêneca 2 with 150hr after tbo. In the last 50hr of flying I suffered two escape valve failures. At 100hr the left engine number 3 cylinder didn't hold the pressure, compression was 38psi and escaped via the escape valve. At 150hr it was the right engine number 1 cilinder, same symptoms.
All other cylinder compressions where between 75psi and 80psi, three of them at 80psi.
The maintenance was blaming me the pilot to fly to poor, (same maintenance that sold the plane to my boss last year).
I'm flying at 75% between 30,6 and 31 Pol, depending on my flight level like the manual is telling me to do, egt round about 1400F. That gives me a fuel consumption around 12.2 - 12.5 gal per hour each engine.
The cylinders are P15.
Now I will replace all valve rotator and valve springs.
Hopefully that will eliminate the problem.
good video ,
Great video Dave! One question, how do you apply the lapping compound when lapping a valve? Thanks!
I generally work through the exhaust valve port. Some will leave the exhaust installed and work through a spark plug hole.
most interesting !!!!!
Hi Dave Are exhaust valves always raised and intake valves level with seat or is that just the camera. They appear to be raised in my dodge ram v8 too.
I just had my Lycoming O-360 cylinder #3 suddenly shooting lots of oil out of the cylinder through the exhaust pipe. I have a short independent exhaust pipe on each cylinder. Like an L shape short exhaust pipe. So, I can see the condition of each exhaust pipe independently. At first I thought, would it be the oil ring broken? I have borescoped the cylinder and the valves and I see the exhaust valve doing the same thing your valve in your minute 26 does, it moves sideways when opening then back when closing. I don't understand why the oil spilling out the exhaust happened so sudden. Could it be the oil seal ring stuck due to gunk inside its spring thus not allowing to expand and seal oil away from combustion chamber? I haven't seen any scratches on the cylinder either. The compression is about 64/80 the valve seat is not bad. But that side move is actually there. All the other cylinders are pretty good on compression 78/80 or better. I am thinking about replacing #3 with a new Superior and skip any tentative to fix the one in place. Any tips?
Hey Dave, great video! I’ve been struggling with lower compression in cylinder number 1 on my 67 piper Comanche 260 with an IO540. I have 1300 hrs on the engine. The compression reads in the mid 70s when cold and no audible air leak from the exhaust, however, when the engine is ran for about 10 min and rechecked, the compression drops to low 60s with very audible exhaust valve leakage. Borescope looks good with pretty even pattern. I’m going to re borescope again after watching your video and confirm the symmetry. No morning sickness or issues running at all. Oil analysis has been great for 400 hrs. Anything throw a red flag about my situation? Thoughts? Thank you sir!! I also have a JPi 830 and all CHTs and EGTs are unchanged and all look great.
What happens if you check compression after a flight? It's strange that compression would be lower after a 10 min run. Typically compression is lower when cold. It could be possible that a short ground run caused a chunk of lead to get stuck on the valve seat.
@@AirDavePasqualeAviation thanks for the fast reply. The low compression has been going on for the last 60 hrs or so. It has not gotten any worse…. The better compression when cold threw me off too. I borescoped it yesterday and found something in the valve seat that looked funny. I can’t quite put my finger on it but the valve it’s self looked really good, nice and even. If you care to take a look I can forward you the photo. It’s not like anything I have seen in your videos.
I added AVblend to the fresh oil change and flew it 9 hrs for a personal trip. I will redo the compression test on Friday and report back.
@@askmehowiknow3571 I've seen balls of lead form on the seat and hold the valve open enough to give low compression. Sometimes staking the valve can blow it off the seat. A less invasive way to get rid of them is to run the engine/fly the airplane for an hour.
@@AirDavePasqualeAviation I forgot about steaking the valve. I’ll talk to a local mechanic and begin there! I flew it for about 4 hrs and the compression increased to 64psi from 60. It’s still leaking from the exhaust. Thanks for you help and advice. I really appreciate it!
Very informative, calmly narrated by a skilled engineer. But! Coming from an automotive engine background it really concerned me that the valve side stepping scenario did not throw up a big red flag. As you touched on, the alignment of the the rocker geometry or the guide alignment is off centre. Surely these cylinders would be pulled from service and new guide re- alignment carried out. Also I am intrigued how valves can be lapped in, in situ without allowing the grinding paste entering the cylinder area which would have serious consequences ensuring. Forgive me if I have missed a video on lapping valves and you have covered my concerns already. Thanks Peter
The side stepping happens in all Continental exhaust valves after approx 30hrs of run time. I have seen valves that were very loose and still had normal heat signatures. In fact the majority of valves I look at have normal heat signatures and side step when closing. I believe the reason this isn't more of an issue is because of how slow the aircraft engines turn when compared to automotive engines. To answer your statement about pulling the cylinders. I do not pull cylinders for side stepping valves alone. They need to have a burned valve that is beyond what would be lapped in place. I haven't made a video on lapping valves yet. I clean the lapping compound off the valve and seat during and after the lapping operation.
@@AirDavePasqualeAviation Helpful explanation, I have noticed that as well, glad to know its "normal". Would second the request for a valve lapping video.
Why would you replace the springs in addition to the Roto-coil?