I think everyone who watches this channel spent their childhood taking things apart, I know I did ! The modern world is too disposable, no one seems to want to fix anything just dump 'em and buy a new one. We are the old school who fix things and you cannot get much greener than that!

Thank you for your time. I have currently got 4 students watching your videos here in Australia, this is one of them now. We are learning in class about a sustainable future. without this level of willingness to have a go, i believe our future generations will go backwards. I applaud you for your effort to fix things that would be otherwise be thrown away. And I hope you can continue your work. Thanks again.

I got an air compressor that would turn back an forth about 3/4 of a turn. When I took the head off it was about 1/4 full of rust and water. I drained out the cylinder and removed the piston. Cleaned and honed the cylinder walls. Cleaned up the piston and reinstalled it. Changed the oil (had water in it also). Tried it and it ran flawlessly. I still use it. Got it for free from the side of the road. No parts where needed.

Tear down videos are the best. One can learn tons about how things are put together and how things are engineered. Thanks Mustie, always a great time!

Man....there is something relaxing about watching your videos. Never stop.

"Oh, no you're not!" I spit coffee laughing. I always wondered what was inside an air compressor. Now I understand how they work. Another unanswered question in my mind is answered. Thank you for posting. I learn so much watching your videos. I really appreciate your hard work. I think it succomed to "VW cylinder 3 syndrome" . The failed side got too hot

Mustie I'm 15 and you have inspired me to start fixing small engines. So far I have fixed 3 lawnmowers and 1 strimmer. You have taught me how to test spark and clean carburetors out and unseize engines. Thanks again mustie because I really enjoy fixing things instead of playing computer games. And I'm making money from selling them

"That's not a good sign" Fav Mustie reflection! Love how he talks to camera like we are right there.

Good example of what happens when you don't check the oil level! Love your vids Mustie..Not only are they informative and entertaining, I just love how you include your fans in how you treat us just like we're there watching/helping/and exchanging views lol. Keep 'em coming Darren!!

Used to get into trouble from my dad as well problem was i had access to his tools and love taking things apart then fixing them even though they weren't broke . Keep up the good work John

That was fun Mustie1👍 I enjoyed it a lot and I would totally watch more of this kind of content. Thanks for letting me hang out with you in the garage again and thank you for all the hard work you do for us here in KZfaq land.

I absolutely love watching you take it apart and finding out what it was that failed and how you could make it stronger obviously there's no money into rebuilding that pump but I love taking things apart I take part of my dad's little slot cars which was no big deal back + 86 cuz they're only a dollar now they go for up to $100 a piece I got a pretty badly damaged the back which doesn't allow me to do this kind of work so watching these videos are very satisfying to watch keep up the good work

oh the absolute joy of pulling things apart to see how it functions!!!! thanks again

When you used your foot to catch the piston I thought I was the only one to do something like that, Thanks for your videos

Glad I found this channel. Really enjoy the variety and your thought process and methods. I'm a former gunsmith and now auto technician, so working on a variety of different things and seeing other people's methods is enjoyable. Great show to watch and learn.

So glad I found your channel. Hard to stop, hard to look away. You make everything very interesting to watch and to listen to. Mr. Information in a great way. Thanks so much

We were waiting for this. Not as bad as it sounded. Appreciate the teardown Mustie.

I was always taking things apart as a kid and still do at 57 years old 👍 fun to see how stuff works.

Your commentary in it's detail is very valuable. Keeping things going is not only smart it's economical. When someone else gives up on it, you take and revive it. I've seen your videos and I'm amazed at how you can take things and make them run so good. Kind of reminds me when I was working on aircraft and big rig trailers. You fix them until you can't fix them no more. The one thing I like about your video is, you don't speed the video up. When something takes to long, you stop, finish, then start videoing but we get the idea. At least I do. You just save us from going through a drawn out situation and go right to the instruction part. I say keep up the good work, too. An amazing fix it man you are there.

“Burned out air compressor. Will it run?” Not so much. I’ve always wondered what was inside one of those. Now I know. Thanks Mustie!

The story is all in Mustie's mitts. No pretty nitrile gloves here. I enjoy his meat and potatoes approach in making repairs, reminds me of so many people I know or once knew. I see rusted frozen/ seized parts, worn out wrenches, rounded out bolt heads, nuts and jagged metal edges, the hands say a lot. This is one of my favorite, most relaxing "Man stuff" channels. keep up the good work!

Great video. I used to repair air compressors many years ago and if I had to guess, I thought that I saw some carbon at the top of the bad cylinder and I've seen several air compressors that were neglected and the owners put off maintenance so long it allowed carbon to build up to the point that the piston starts hitting the valve plate just ever so slightly until it just gets worse and worse until, well you know what happens then. The wrist pin is the first part to go from repeated contact until it finally gives up the ghost. For those that wonder how you can get carbon in an air compressor just consider that you have all the components required for creating the carbon; oil, pressure and high heat . . . . oh and don't forget, neglect. Air compressors need maintenance too, and I have seen some real badly neglected air compressors. Your video's educate the newbies among us.

Just wanted to say a big thanks mustie1, found my first busted generator on the side of the road, took the spark out cleaned the carb and bam works like a bought one. Learned more from watching some bloke in his shed tinker than i did in 3 years of auto tech at school.

good autopsy. It's kind of incredible how things break. I've worked on quite a few different styles of air compressors (mostly in the navy) up to high pressure units that put out 4500 PSI. Thanks for sharing some great content.

Thank you for satisfying our curiosity Mustie, I hope you get a million views.

I liked the way that you got super quiet when you launched the snap ring so we could hear the landing lmao

Love your vids Mustie1. Thanks for taking us inside the workings once again.

For anyone who wrenches as a hobby these videos are so much fun. It is how I think anyone who like to paint must have felt watched Bob Ross. It is a happy and calm place of fixing things

A little lesson on water separators. In order for water to be effectively separated the water has to be in liquid form, when the air leaves the compressor the water is vapor, as the air flows thru the lines the air cools and the water returns to a liquid, the further away from the compressor the more effective the water separator works. It's recommended to be installed down line at least 20ft from the compressor.

Thank you for showing that, I was very curious

I liked that you found out what the knock was instead of guessing. I never had a compressor- pump apart, so it was interesting. Thanks

I am new to the world of mechanics and to be honest, I really enjoy learning the things I have and what I still am and Mustie1 gives me the inspiration to keep trying and going and continue learning!

Thanks man,first time seeing the guts of one of those. Surprised to how much it looks like a gas motor .

Random thought. It looks like the piston furthest away from the fan overheated and began to seize, therefore causing the piston pivot to fail. It makes you wince just thinking about it.

Boy! Every time i watch one of your videos i learn tons fo stuff. Thank you for taking that extra time to set the camera in the right place and voice your thougts as you go along. Very instructive.

Furthest cylinder from the cooling fan always suffers the most, the carbon build up is from when the oil got low it started to over heat and boil it, Another great video Mustie1. Thank you

Those drain valves are a real PITA. I replaced my valve with some fitting and a 1/4 turn valve with handle from Lowes. Best thing I ever did on my compressor. It makes it convenient to drain and then you do it frequently.

Haha finally mustie! I’ve been wanting to know how bad this was and you only went and did it for us!!!!

One of your best vids Mustie. I love it when you get right down to the nitty gritty.

Thanks for the video sir and your time to make it. It was good to see what went wrong with the old one.

I actually leaned over my phone to have a better look, once the oil pan was off. 🤣

it may have been sitting at an angle with the rear having less oil, but it was probably all temperature related, since the better end had the pulley/fan crank snout with more heat transfer and air cooling.

Thank you for the tear down, I've always wanted to see the inside of one of those pumps, but never had the opportunity.

I enjoy your videos very much. I have collected old engines for many years but had kind of lost interest and this has helped renew that interest and give me more ideas on how to repair them. Thanks!

A what went wrong wednesday, wonderfull.

As far as the piston "hitting the top of the head" goes... The "pressurized" air on top probably cushioned the piston from hitting the head. Great "airtopsy" LOL

Great to see the other motor being installed, and for my part even better to know how messed up this motor was. Keep up the good work.

Enjoy your channel - tried to rebuild a compressor a few yrs back and learnt that Asbestos gaskets were still present on the reed valve setup. Something to check with old equipment. Was using compressor for bead blasting so it ran more than the 50% cycle time rule of thumb which is why it cooked itself. The hotter it runs the more moisture you trap under compression. On my replacement compressor I ditched the brass drain valve because if it's not easy to access it rarely gets checked. Put an elbow with flexible line to a ball valve at a more accessible spot so I don't forget. cheers

I didn't look at the valving very closely, but, often the cylinders operate in series -- the output of one goes to the input of the other, which further compresses the air while sending it to the storage tank. The high-pressure cylinder in under much more physical stress as well as operating at a higher temperature, and that is why one cylinder is in much worse shape than the other. This may be a single-stage compressor, though, because the secondary piston in a dual-stage is ordinarily quite a bit smaller than the primary in order to equalize the load.

By popular demand! it didn't take much convincing though. Thanks, that was cool! and no blowback from daddy.

That was interesting! I just brought home an old Sears 18 gal compressor somebody brought to the curb, cleaned it and fixing it up, works great. I got in trouble taking things apart when I was a kid too, 8,9,10 years old, "We just bought you that toy a few days ago, why'd you take it apart?!" Weird thing is that I was going to bid on one like it tomorrow but it's gas powered.

Thanks for pulling the old compressor pump apart,. When I watched your first video on this compressor, I wondered what this one would look like.

That loose and wore out piston rod was just like my right knee before i had it replaced! ; )

The reason the bearings wore at an angle is that the heaviest load on the compression stroke. During this time, the rod is at an angle to the bore so the maximum load is at somewhat of an angle to the center line of the rod, piston and crankshaft.

Great video, mechanical autopsies are always interesting. This compressor, is a two stage. The larger piston is the low pressure side, the smaller one, the high pressure one. the higher pressure piston gets considerably hotter then the low pressure side, and oil is much more critical. Chances are, the oil sealing ring let go, and what you are seeing on to of the piston is burnt oil, then it just expended and began beating itself to death. These things are really easy to rebuild, if your just changing rings or gaskets, but you can get parts pretty cheap.

Love, love, love watching your video. learned so much. My brother was the same way, he alway took thing apart. He was 325 lb when he died, he had confidence and self esteem. i'm fighting to hit 150 lb no confidence or self esteem. Please keep the videos coming.

Another fantastic video, but I would really like to see you rebuild that CT70 motor....

PROGNOSIS: Heart failure...severe failure of the Right ventrical

Thank you for the strip down. It is so cool to see what was going on. Not seen a piston go like that before cool.

I love watching your videos I tell all my friends to watch you I learn a lot from you and I love the way you talk through a task keep it up

In Australia we would call that compressor ROOTED

I like to see you try to make a running engine out of it. You have great video’s keep up the good work

I'm about to tear into my shop's 17 year old 60 gallon compressor. Last month one of the flexible lines burst overnight and it just ran to death. So far, this is the most helpful video I've found. I'm buying a new pump. Thank you very much.

I really like your videos. I always learn something. The format in how present your content, is like watching Bob Ross but with small engines. Great video sir!

If the two pistons are the same size, the second stage piston has a higher operating pressure. One I took apart had two different piston sizes, and the air from the first stage piston went into the second stage chamber and was compressed higher and put into the tank. I'm not sure your original compressor was actually a two stage compressor, but instead a two cylinder compressor for higher volumes, and 120psi pressures.

Great morning, coffee and Mustie, what a great start to the day.

Thank you for that. I now know far more about comressor heads than ever before, and I encountered my first some 45 years ago. The other thing in air supply systems is the pressure regulator. It would be good some time to show how they work; all that flapper & nozzle stuff. A guy named Harry at a Honeywell training centre taught me about regulators those same 45 years ago but I'm not so sure I retained everything he said. Time for a recap.

Thank you for taking that apart! It would have left an empty feeling if you hadn’t torn it down. I guess we all have the same tendency to figure how it works and why it failed! I think that is what has made America great! That tinkerer’s curiosity!

Carbon is always an issue with compressors. It looks like a good candidate for a rebuild, but I wouldn't bother with it. Run of the mill single stage. Tank seems to be in really good shape. Didn't see any rust in the water when you drained it.

You know Mustie1 is not serious about fixing this when he does not use the "Favorite Hammer" to disassemble the machine! Premature Comment Alert! 9:03 The Hammer appears! Thank you for another superb video!

Thanks for the demo on the reed valves. First time I have seen them. An intersting take down and diagnosis. Man that thing must have scremed and stunk when it was going down.

There’s a lot of aluminum there to be pitching in the round file, I would send it to one of those guys that has a channel we’re they melt it and do ant mound sculptures. Love the show, love your attitude and the effort you put in to showing every one watching exactly what’s going on. Thank you and keep up the great work.

In Aussie land we call those circlips /snaprings, Jesus clips as in as they're air borne you're praying to or asking Jesus where did that go.

I can forget about the world problems watching your videos.

A learning experience. Thankyou Mustie.

Thanks for making this video. I have been wanting to see what had happened.

22:24 I was waiting for the compressor to lift off...😋

Thanks. There is nothing wrong with a long video ( from my point of view ).

Thanks for tearing that apart. I have never seen the inside of one either. Not a lot of surprises, but still nice to see. Love the channel!

One side is more damaged because it was further from the fan , so one side runs cooler than the other , love this channel 👍

low worn out oil and over heating due to the fan like you said

Leave one piston out and it's a good 1 cylinder compressor

Thank you for posting such awesome videos!

I'm amazed that you don't have an air coooled VW engine based air compressor, I've seen a few over the years. One would fit right in at the new shop. Love the informative videos, keep up the great work!

Ha! When I was young, I got in trouble for taking everything apart. I can remember my Grandma yelling at me “You don’t come into someones house and take things apart.”

My father and his brothers tried exactly that in the late 40's. Apparently it cannot be done without the counterweight in the crankshaft any engine has. It will ignite and stay down. Greece here.

thanks for tearing this down I'm amamzed how much a compressor is like a gas engine. Much learned here

One cant just throw things away without seeing what was bad. Didn't expect to see the wrist pin bad. Great job!

I think you hit the nail on the head, the bad cylinder was hotter because it was farther from the fan.

Looks like you could rebuild it if you wanted to would make a great video

I absolutely love this channel. Keep doing what your doing it’s so much fun just learning 👌👍👍👍

I am glade that you decided to do the What happened vedio, would like to see more of them.

Nice high volume cylinders. I say rebuild it!!! I'm in for $20 to see what it takes. Others will chip in for sure!

Maybe it was leaning toward the pully side and the oil level wasn’t even so the number two cylinder wasn’t getting as much oil to it as it should have?

Great videos! Thanks for all you do!!!

Thanks for taking the time to do this I’ve always wanted to take one apart

The difference in wear could be a result of a 2 stage compressor where the burnt piston was being fed higher pressure air from the good piston... more stress compressing compressed air wire it out faster? Along with not being as close to the cooling fan...

My friend .....I prefer the term ....."OFF WITH IT'S HEAD!" .....LOL@me

Excellent again, Mustie. You have fans in Ireland as well as in Australia! Keep it up.

Mustie... I agree with you. The piston that failed gets less cooling air from the fan. It probably caused the carbon build up due to higher heat than the other piston.... Also, that fan guard is far to restrictive. The way it's been deigned it blocks off at least 50% of the air flow.. If you cut every second rib out on the inside cover where the fan blows onto the compressor you'd get far better cooling and the compressor will last a whole lot longer.. In the past I've replaced that section with wire mesh and it made a huge difference to the air flow.