Engine Teardown on Lycoming O-320 after 20 Years in a Barn! - Airplane Rebuild | Thorp T-18 

I love how I'm in my ACMT courses to get my A&P license and currently am tearing this engine down. Never did I think I'd stumble across a video with the exact engine I'm working on (albeit, a much, much nicer one than the one we've got in class). Love how the guys and I are tagging everything the same way you are (Ex cyl. 4, Intake cyl. 2 etc.) Thanks for posting brother!

Great video, thanks for posting it.

I have owned an IO320 Thorp for 3 years. It's an awesome plane and turns heads everywhere. You'll see 170+ mph out of it.

I'm in the same process, at the same stage as you are. My crank is good as my plane is flown regularly. I had a visible crack in the engine case. Pulled the engine and the cam did not pass inspection. Used the opportunity to purchase the upgraded cam and have the accessory case upgrade done to accept the one piece cam shaft. Re-assembly should start mid January. I also have chromed cylinders.

Nice video...thank you.

Thanks for that. I've got one in my Darter 100 2400hrs.. It's not run in 8 yrs, in a desert climate, so it's borescope time for the cam which is the determining factor in these engines.

I haven't even watched the whole video yet (I will) but your camerawork is immaculate and choice of music is on point!!

Great thanks

Ugg... hope that crank turns out ok. crossing my fingers.

What kind of cleaning do you do on these cases? Thanks for sharing, very interesting video.

Man what a score Thorps are great flying machines. Hey if ya Cam is and crank only issue be just WOW. I mean 90% is fine engine wise heres rooting for ya on the Crank. Keep at it carry on. Also love the Tailwind a real sleepercof a Flying machine.

Hey, I know I am a bit late to the party but if you'd like the dimensional specs or that engine I might be able to hook you up. Thank you by the way for bringing those ad's to my attention. I'm currently overhauling an o-320-e2g and I must've overlooked those.

I think Lycoming says to overhaul their engines every 12 years, whether sitting on a shelf or being used. But, if you’re part 91, you don’t have to follow that recommendation. Btw, the crankshaft nose plug is to hold oil pressure into the crank for fixed pitch props, or removed for constant speed props to send oil pressure to operate the prop governor/pitch change mechanism.. A&P/IA

Wow! @4:59 they sure left the inside of that crank rough cut! Heck those tooling marks would cause cracking and fatique corrosian or no. Is such a poor finish normal for the inside of a crank?

I need to come hang out when your at the hangar sometime.

Those engines will run until the cam lobes are down to eccentrics, where you'll finally start to get misfires. I have an O-320 cam in my garage I use as a paper towel holder. It came out of a Citabria in 1979 due to misfires. No oil on it. 40 yrs in my garage, or basement through several moves. It has a bit of fine rust pitting if you look close, in some spots, but is otherwise not that bad considering, except for the lobe worn down. I think the severe pitting you have there is mostly due to acids in the oil. I have an O-290 in my PL2, and if it ever comes out, like if I start getting major metal in the filter, I'm going to have the case cylinder holes bored to a 1/8" radius incr and the case will accept O320 narrow deck jugs. O-290 cylinder parts are impossible to find.

I have always wished that people would store a Lycoming. engine upside down with a couple quarts of oil in it! It would save a couple of cams! Thanks for the videos!

is there any engine overhaul in USA that will allow the owner of engine to overhaul onsite and get certificate thereafter so can open an overhaul centre backk home..me from KL,Malaysia.Thx. mine is d3g 161hp Lycoming

Amazing how expensive these parts are for very old low technology engine parts.

I'm going to take a swing at it and tell you engine is vital the quality of the engine oil is paramount ...

Fingers crossed on the crank Daddio 🤞🙏. Hope it's machinable to spec. What's a new or serviceable 320 crank going for now? 😳

Question, I need to talk to someone about aircraft engines, I'm building an experimental airplane, and I have a ton of questions about the engine I can use. Also how much of the work I can do my self etc. Do you guys have any recommendations?

Is this the 140HP configuration or 160?

these engines seem so complex (lots of precise machines parts) but also primitive. yet we trust our lives to these machines. when we gonna get 3d printed replacements

Save you old oil pump gears, They are perfect for a home made engine pre oiler. This saves your engine life. Most of your pipe line patrol planes use aftermarket pre oilers!

What is the certification process involved in working on one of these airplane engines?

You are powerful 🙏👍♥️♥️👊💪

I want a ride !

Was your crank serviceable?

What specific model of 0320 is it?

I’ve come to realize that any lycoming with that blue paint is of the problem era for all of those corrosion issues

Sorry about the late response. There’s an STC to install 160hp pistons in the 150hp jugs. But that being said as an experimental you can install any compression pistons you desire…

Would like to know how to change a 150hp to a 160hp.

All those years in the barn the starter bracket was safety wired backwards 🤦🏻‍♂

So you must be an A&P? Or else you have experience on legacy engines.

I think that is a serious mistake not having the cases worked!

Not an airplane mechanic...I stick with engines that stay on the ground ...one question..wat do u mean by AD?

kill the bloody music