Teardown Needed?
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- čas přidán 7. 03. 2022
- When metal is found in the oil filter or cam distress is noted after cylinder removal or a foreign object is dropped into an engine, many A&Ps immediately conclude that an engine teardown, overhaul or replacement is necessary. More often than not, it isn't. In this webinar, Mike Busch A&P/IA tells the story of three such aircraft engines (two Lycomings and a Continental) that were rescued from euthanasia under his guidance. Savvy Aviation offers Professional Maintenance Services to owners of General Aviation aircraft, such as: SavvyMx (Professional Maintenance Management), SavvyQA (Expert Consulting), SavvyPrebuy, SavvyAnalysis (Engine Data Analysis) and Breakdown Assistance. Savvy also publishes a monthly newsletter with lots of interesting information for the general aviation enthusiast; subscribe to it at www.savvyaviation.com or text the word "Savvy" to 33777. This webinar was hosted by the Experimental Aircraft Association (EAA).
- Auta a dopravní prostředky
For anyone wondering about current overhaul/new engine costs, a factory new O-200A from air power inc is about $43,000 a factory remanufactured is around $41,000 with 6-8 months of lead time.
The engine shops I have called are quoting about $22,000 for an overhaul. With lead times from as low as 8 weeks and as high as 20 weeks. A prop strike inspection is running about 9,000 as well.
If you need to split the case or need a new engine it will not be a fun time.
with all the supply chain issues and labor issues these days, now is NOT the time to split the case; if you have the option, milk it.
@@savvyaviation If I could I would. I have a cylinder base stud that is coming out of the case. I suspect stripped threads due to the stud not spinning. Unfortunately it screws into the opposite case half. I can't think of an easy way to confirm my suspicions without at least removing the stud which would require the always dreaded cylinder removal.
On a Lycoming 0 320, is it possible to view cam lobes by removing the oil sump or by using a borescope via the drain plug?
DId you mean removing the oil filler tube? That makes it a bit easier, but the view is still not great. The drain plug does not offer any way to see the top of the engine, unfortunately. Lycomings are just hard...
I have received oil and filter analyses with metal reports. Where does one find information with which to match the metal to a part? For example, in this webinar, Mike concluded that the metal was almost certainly from the cam. I would like to match metal reports with engine parts just like Mike did. Thanks for your help.
Call the Engine Manufacturer and ask their service department.
Lycoming SB480, available on their website.
I’m am insure of a catch all SB for continental, I know of one that tells you what to do when you find metal but doesn’t give specifics on where it comes from. That may be in the maintenance manual - ie the M-0 manual for TSIO-550
My engine a TSIO 550 Cont. had a taxi way excursion and all four blades on the MT prop (wood prop) hit the ground. Two were sheared off at the hub. I was going to tear down the engine but it was at taxing throttle position. Should I tear it down or just do an indicator run out check of the prop flange?
To my knowledge, there’s no SB from Continental requiring a tear down. I’d get the prop hub inspected with dye penetrant. Put a prop on it. Run it 30 minutes. Check for run out.
I’m considering a purchase of a very nice airplane with an O-320. It was last overhauled in 1985 and is 400 hr SMOH. The airplane sat unused for 11 years and it was recommended by the shop that will do the pre buy that a cylinder come off to inspect the cam. Sure enough most of the cam lobs had severe pitting on them. The owner is an A&P for an engine builder and says he wants the replace the cam, lifters, seals & gaskets himself. So technically this will be a repair rather than an overhaul. Is this OK or is an overhaul due at this point? I really like the airplane.
I'm going to school for my A&P right now but I worked in aviation for 10 years prior. Given the world of liability we work in I can easily see the family and the lawyers suing the shop because they DIDN'T do a tear down.
They will likely sue regardless, but I get what you mean.
Not related but, We followed the lycoming SB and let if fly for a year since it didn’t seem to progress, but found the culprit- a bad cam the next year and replaced the engine.
You are probably 10 times more likely to get sued for an incident after a precautionary tear down when you didn't follow the SB
If those ball bearings were in the accessory case it seem possible that the next time the aircraft was inverted or in a negative G condition they could end up in the gears! I’ve seen a small bolt end up in the gear train of an engine it locked it up and literally split the crankcase. Can you imagine what would happen if the balls locked up the engine when it was inverted flying at very low altitude, think canyon flying.
why are you flying in a canyon inverted?
Asking the real questions here. It's a Mooney, nobody is flying inverted in a Mooney, let alone in a canyon.@@SoloRenegade
@@cruiserflyer oh, they absolutely could fly a mooney inverted and in a canyon, whether on purpose or by accident is a different question.
1:07:15 FRANKLIN MASTER RACE REPRESENT!!!
If I am replacing the pistons and cylinders at 1500 hours and oil analysis information tells me nothing is wrong with the Rod Bearings, shouldn't I just change the Rod bearings anyway because I have easy access to the bearings? ... I never hear of mechanics changing these bearings. The Rod bearings take the most severe service, why don't we change them when changing pistons and cylinders.
Playback at 1.5x and enjoy your extra 45 minutes
The oil screen on a Lycoming in a Mooney is not in a particular convenient or easy to get to place as suggested in the video. I agree with Mr. Busch that the oil screen would stop the ball bearings but it is not a convenient thing to check on a Mooney. It is located at the back of the sump down low with just barely enough room to slide it out between the oil sump and the firewall. If you ever want to learn new swear words, just hang around a mechanic trying to re-install the screen and get it properly safety wired. Not an easy task....necessary yes but not easy.
agree, its tough to get to, but still better than splitting the case?
@@savvyaviation I completely agree.
Awesome. 1st comment!
Tell me I'm wrong, but this is already at 1.25 times playback speed.
I think you have great experience and wisdom,. Sadly, aside from your irritating stop start way of speaking that is very hard to listen to, you live in the Lycoming/Continental world of the 60's and 70's.See Rotax Jabiru UL Yamaha Honda Catch a wake up Gramps.