As ashamed I am to admit it I am 45 years old and after watching this video I finally understand how a internal combustion engine works... Thank you so much for making/sharing this video
It's never too late. I am very familiar with auto engines, but I have never torn into a small engine. I knew it would have a variation on the same auto components. I just didn't know their configuration. This was a well-done explanation.
I'm still a small engine novice but I'm learning all the time. This has got to be the best demo I've seen in 3 years on here. Awesome awesome video thank you.
get one that is worn out... clean it... take it apart, keep the parts, put it back together again with new E bay piston rings. oil everything up... use 20-50 motor oil as the motor will have excessive clearances in it so it needs THICKER OIL... with 20% STP OIIL TREATMENT...thick as honey. tighten the CONNECTING ROD, sump and heads with TORQUE WRENCH TO SPEC's OFF GOOGLE FOR THAT MOTOR... the model # is on the tins. dont lose the tins as there are a zillion differnt briggs as they couldnt leave the thing alone over the years so they are all a LITTLE different. new plug... new coil? clean carb with WD 40. new gasket set off e bay $12. oil bolts before assembly so they dont freeze in their holes. TIGHTEN TO SPEC's avail online for that motor. add the thick oil, paint it JD green. write on it with paint pen... CHECK THE GD OIL BEFORE EACH RUN OF THE DAY... USES 20-50 MOTOR OIL!!!!!!!!! new air cleaner... 5 for $9 on e bay and see if u can get it going again as a mower... sell it for ... $75 or so. TELL THEM TO CHANGE THE GD OIL EVERY
That's the way to make an instructional video...Pertinent information given concisely without a lot of extra verbage which only leads to distraction...Nice job.
Yesterday, I picked up a dead mower off the roadside with this engine on it. Cleaned the carb and it ran like new. Came to this video to see the internals. Thanks for the excellent cutaway.
Great video! This helps me very much try to understand how engines work. I have very little small engine knowledge but recently decided to pick up a wood chipper with a 7.5 hp briggs and stratton horizontal shaft. I figured i'd spend some time and figure out what was wrong with it and try to learn something. The first thing i did was check the oil. It looked new. However when i checked the dip stick, it was extremely low. I drained the oil to find there was very little left. So i filled it to the proper level with new oil. I checked the spark. There is a spark. I changed it just for the heck of it. I also cleaned the air filter and the carburator. Gaskets seemed ok, but not great. When i originally tried to pull start it, it wouldnt pull at all. It was stuck. Eventually i was able to pull it and at that same time, a blade within the chipper cracked off. So i think the shaft was jammed due to the blade getting stuck. It now pulls, but doesnt do anything. it doesnt sound close to starting at all. I dont get sound that sounds like it is starting. I pulled off the combustion chamber and valves. When i rotate the flywheel, i noticed the piston doesnt travel all the way up the cylinder. When i push it down, then rotate the flywheel, the piston comes up about 3/4 of the way. Could the piston not moving all the way up the cylinder be a result of low to no oil? How can i get the piston to travel all the way up the cylinder, as it does in your video when you rotate the flywheel? I have tried lubricating the top of the piston with oil and PB Blaster and spreading it around.. no luck yet. It has slowly rotated counter clock wise as i push it down with my fingers, rotate the flyweheel, and repeat. But never going more than 3/4 of the way up the cylinder. Thanks for the help :)
Well, not all engines are gonna be made the same. The piston on this particular engine comes all the way up, but it might not on yours. My question would be does the piston move up and down on its own by turning the flywheel?
I am about to attempt to repair an old Briggs And Stratton engine from probably about 20 - 30 years ago and this gives me an incredible idea of how Briggs And Stratton designed their engines so thank you so, so much!
Thanks for the video. I have been mowing grass most of my life but I have never had a better explanation of the internal combustion engine. Actually, that was the first explanation. Wish it had been taught in school. Lol.
That was an awesome explanation of how a f our stroke engine works. What I would love to learn more about is how the springs on the carburetor and the arm on the fan above the engine work in equilibrium to adjust the engine speed
I found an old B&S powered mower at the town Transfer Station today and want o have a little guy I know tear it down with me, just for fun. It's kind of a Grandpa thing to do. I wanted to see how you cut the engine so the parts are visible and he can watch them. Your work is a great tutorial. Thank you!
At around 1:11 if you look closely the exhaust valve opens just a hair. The shadow around it gets a bit darker. Is there a reason for that? Was it just the way you turned the flywheel? Or am I seeing things? Awesome demonstration. Overall surprisingly simple.
it is just a compression release on the exhaust valve at arm pull speed to make it easier to turn over. as soon as it starts centrifugal force disengages this mechanism.
The short answer is no, but you can make anything work with enough effort... The best option for a go cart would be a horizontal shaft small engine. This is a vertical shaft engine. That term specifically relates to the orientation of the crankshaft.
@@johndeerejared Thanks for the answar, I am just courious. I am at my first year at mechanic school, in this year I will build a go cart on end of school year. So I am planning to build one at home next summer after I've been learned how to do it.
@@Michael-ks1sn that sounds awesome! A channel I follow is called Cars and Cameras, they do a bunch of custom go kart and mini bike builds and that sort of thing. That'd be a real good resource for your build I would say
The pull cord recoil will only turn the engine over clockwise when starting, and I believe the timing would be ever so slightly retarded so the spark plug fires after the piston is at TDC.
I've been working on small engines all my life pretty much but it still makes me wonder who decided to make the cam shaft out of plastic?! I suppose if it's hard enough and is bathed in oil it will last pretty long.
Thanks! It is made of plastic, though in my experience they are highly reliable. Generally something else will fail on the mower before the cam will fail.
I'm trying to learn about small engines, which is how i ended up here. So, that's a "flathead" engine right? because the valves are next to the piston.. not above it, correct?
thanks for this..I am trying to bring an old 4hp briggs to life but the intake valve is not opening.The tappet is for is barely coming up far enough to just barely kiss the valve stem/.Would you suspect a bad/broken lobe on cam shaft?
Great, observation! That is correct, it will spark on every revolution. Of course it only NEEDS to spark on the power stroke, but I believe this was the simplest way to make it for Briggs. The extra spark really doesn't affect anything.
How does that governor thing i keep hearing about work in relation to the camshaft and how does the oil get up to the rocker cradle on a overhead valve engine?
Well, the engine actually does run clockwise. You would refer to the direction of rotation from the flywheel side. Can it run counter-clockwise? Probably, but the oil slinger would be going the wrong direction and wouldn't sling oil to the cylinder which wouldn't be good 😆. There could be other issues with it turning backwards but that's the only one I can think of off the top of my head.
If the crankshaft spun in reverse, the camshaft would also spin in reverse. Because of how the camshaft's lobes are positioned, the intake-lobe would still allow fuel-air mixture in (during the intake-stroke). BUT then the exhaust-lobe would immediately allow that mixture to exit out the muffler (during the compression-stroke), leaving nothing for the spark to fire.
I mean is it wanting to fire at all? If it's not getting spark then it's obviously not going to run😂 Spraying starting fluid or carb clean in the intake should get fuel to the combustion chamber, so it should try to start. But if you don't have the kill switch on it's also not gonna start... We've all made that mistake before 😆 I will say whenever I work with any 2 stroke engines I try to use mixed fuel instead of starting fluid so the cylinder gets the lubrication it needs
As ashamed I am to admit it I am 45 years old and after watching this video I finally understand how a internal combustion engine works... Thank you so much for making/sharing this video
Is just a time chain like a car bro tf
It's never too late. I am very familiar with auto engines, but I have never torn into a small engine. I knew it would have a variation on the same auto components. I just didn't know their configuration. This was a well-done explanation.
I'm still a small engine novice but I'm learning all the time. This has got to be the best demo I've seen in 3 years on here. Awesome awesome video thank you.
get one that is worn out... clean it... take it apart, keep the parts, put it back together again with new E bay piston rings. oil everything up... use 20-50 motor oil as the motor will have excessive clearances in it so it needs THICKER OIL... with 20% STP OIIL TREATMENT...thick as honey. tighten the CONNECTING ROD, sump and heads with TORQUE WRENCH TO SPEC's OFF GOOGLE FOR THAT MOTOR... the model # is on the tins. dont lose the tins as there are a zillion differnt briggs as they couldnt leave the thing alone over the years so they are all a LITTLE different. new plug... new coil? clean carb with WD 40. new gasket set off e bay $12. oil bolts before assembly so they dont freeze in their holes. TIGHTEN TO SPEC's avail online for that motor. add the thick oil, paint it JD green. write on it with paint pen... CHECK THE GD OIL BEFORE EACH RUN OF THE DAY... USES 20-50 MOTOR OIL!!!!!!!!! new air cleaner... 5 for $9 on e bay and see if u can get it going again as a mower... sell it for ... $75 or so. TELL THEM TO CHANGE THE GD OIL EVERY
Wouldn't call 3 years a novice, more like intermediate
One of the best videos I have ever watched on explaining the engine operation.
This was not absurdly long but was extremely informative! Wonderful demonstration, learned a ton
This was exactly what i wanted to see. Thank you for the taking the time to put this together, it was really helpful!
That's the way to make an instructional video...Pertinent information given concisely without a lot of extra verbage which only leads to distraction...Nice job.
Very well done Jared, you broke that down very clearly.
Have a blessed day.
Yesterday, I picked up a dead mower off the roadside with this engine on it. Cleaned the carb and it ran like new. Came to this video to see the internals. Thanks for the excellent cutaway.
Best explanation of the parts and functions of a small engine and its parts! Thank you, man!
Great video! I’m 50 years old and you’ve just turned an old parts changer into a troubleshooter!
In the event of an apocalypse, I will be heralded for reinventing lawnmower engines because of this video.
Amazing video! You should consider taking it further with timing, ignition and carburetor.
Great video! This helps me very much try to understand how engines work. I have very little small engine knowledge but recently decided to pick up a wood chipper with a 7.5 hp briggs and stratton horizontal shaft. I figured i'd spend some time and figure out what was wrong with it and try to learn something. The first thing i did was check the oil. It looked new. However when i checked the dip stick, it was extremely low. I drained the oil to find there was very little left. So i filled it to the proper level with new oil. I checked the spark. There is a spark. I changed it just for the heck of it. I also cleaned the air filter and the carburator. Gaskets seemed ok, but not great.
When i originally tried to pull start it, it wouldnt pull at all. It was stuck. Eventually i was able to pull it and at that same time, a blade within the chipper cracked off. So i think the shaft was jammed due to the blade getting stuck. It now pulls, but doesnt do anything. it doesnt sound close to starting at all. I dont get sound that sounds like it is starting. I pulled off the combustion chamber and valves. When i rotate the flywheel, i noticed the piston doesnt travel all the way up the cylinder. When i push it down, then rotate the flywheel, the piston comes up about 3/4 of the way.
Could the piston not moving all the way up the cylinder be a result of low to no oil? How can i get the piston to travel all the way up the cylinder, as it does in your video when you rotate the flywheel? I have tried lubricating the top of the piston with oil and PB Blaster and spreading it around.. no luck yet. It has slowly rotated counter clock wise as i push it down with my fingers, rotate the flyweheel, and repeat. But never going more than 3/4 of the way up the cylinder.
Thanks for the help :)
Well, not all engines are gonna be made the same. The piston on this particular engine comes all the way up, but it might not on yours. My question would be does the piston move up and down on its own by turning the flywheel?
This video was very well done. Please make another that explains how the electrical and carb work as well.
I am about to attempt to repair an old Briggs And Stratton engine from probably about 20 - 30 years ago and this gives me an incredible idea of how Briggs And Stratton designed their engines so thank you so, so much!
Thanks for the video. I have been mowing grass most of my life but I have never had a better explanation of the internal combustion engine. Actually, that was the first explanation. Wish it had been taught in school. Lol.
This was really one of the best videos I've seen of "how it works". Excellent done!
Hey Jared, this is Eli. This video was amazing! Very informative and professional! You’ve outdone yourself.
Good job young man. We all learned something from the inner screen.
That was an awesome explanation of how a f our stroke engine works. What I would love to learn more about is how the springs on the carburetor and the arm on the fan above the engine work in equilibrium to adjust the engine speed
Mabey google springs and arms that do not much at all.
I'm trying to learn all I can about my mower and it's engine, so THANK YOU for this very informative video!
Great video and the cutaway really helps. If you can understand this then you’ve learnt how pretty much most engines work
Wow i think that was one of the best break down explanation ive ever heard/seen. Thank you so much for being so clear
This was an absolutely fantastic explanation and break down of how things work. Ty for making this video :)
Well done, great cutaway!
Very informative video explaining how the 4 stroke engine works
Thanks for this. Now I see why overfilling with oil would also inhibit the deliver of oil via the paddle wheel.
I found an old B&S powered mower at the town Transfer Station today and want o have a little guy I know tear it down with me, just for fun. It's kind of a Grandpa thing to do. I wanted to see how you cut the engine so the parts are visible and he can watch them. Your work is a great tutorial.
Thank you!
This video was very helpful. Thanks Jared!
This made it so easy to understand. Thanks so much Jared!
Very nice how you made a learning model of an old engine
Great job, very clear.
Excellent presentation. Thank you and well done!
This is so well made Jared. Thank you!
Excellent presentation! Love the cutaway engine.
Thanks for this video - really helps understanding these engines
straight to the point clear concise nicely done.
Clear and concise. Excellent video.
Great explenation of how it works internally.
Thank you so much for this awesome visual video.
Just what I was looking for. Thanks!
Thank you for making this concise and informative video.
Very Helpful! One question, how does oil get into the rocker cover and between the rocker and the valve tappet, and does the oil need to go there?
Awesome explanation. Thank you
Very cool and interesting.
Well done, very professional.
That was really good. Our mower occasionally seizes as you are pulling the starter cord. What is happening with that? Thanks for your help.
Great video. I was keen to learn how the flywheel works.
Great job 👍
Bravo 👏 excellent presentation
At around 1:11 if you look closely the exhaust valve opens just a hair. The shadow around it gets a bit darker. Is there a reason for that? Was it just the way you turned the flywheel? Or am I seeing things?
Awesome demonstration. Overall surprisingly simple.
it is just a compression release on the exhaust valve at arm pull speed to make it easier to turn over. as soon as it starts centrifugal force disengages this mechanism.
Great Job!
Awesome - very helpful and informative.
This was pretty cool. Good effort.
Well done!
wow great video, i wanted to know why my engine isn’t starting…but thought first I need to get an idea how it works …when it does start, thanks!
Very good explanation.
Very clearly explained. Thank you!!
Great video. Thanks!
This is great! Do you have one for ignition and spark?
Awesome video, big thanks!
I enjoyed this. Thanks.
Excellent video 👍
Very informative and interesting video!
Excellent video!
Can I use that motors for other things? An example I want to know is; can I use it to make a go-cart?
The short answer is no, but you can make anything work with enough effort... The best option for a go cart would be a horizontal shaft small engine. This is a vertical shaft engine. That term specifically relates to the orientation of the crankshaft.
@@johndeerejared Thanks for the answar, I am just courious. I am at my first year at mechanic school, in this year I will build a go cart on end of school year. So I am planning to build one at home next summer after I've been learned how to do it.
@@Michael-ks1sn that sounds awesome! A channel I follow is called Cars and Cameras, they do a bunch of custom go kart and mini bike builds and that sort of thing. That'd be a real good resource for your build I would say
Did you use just a standard 4 inch angle grinder to build the cut away ?
Wow, this was fascinating and very instructive! Thanks for the vid.
This is very helpful! What prevents the crankshaft from rotating in the opposite direction?
The pull cord recoil will only turn the engine over clockwise when starting, and I believe the timing would be ever so slightly retarded so the spark plug fires after the piston is at TDC.
I've been working on small engines all my life pretty much but it still makes me wonder who decided to make the cam shaft out of plastic?! I suppose if it's hard enough and is bathed in oil it will last pretty long.
does the oil slinger have to be set back any particular way if it is removed?
Is it carbureted? How does the engine get the right fuel-air mixture?
Thank you for a very clear explanation.
Nice ! I always wonder how the valves were connected to the crankshaft on the type of engine . It’s the cam shaft plastic ?
Thanks!
It is made of plastic, though in my experience they are highly reliable. Generally something else will fail on the mower before the cam will fail.
That's why I clicked. I was so surprised to see nylon cams!
I'm trying to learn about small engines, which is how i ended up here. So, that's a "flathead" engine right? because the valves are next to the piston.. not above it, correct?
That is perfect!
You deserve more subscribers
thanks for this..I am trying to bring an old 4hp briggs to life but the intake valve is not opening.The tappet is for is barely coming up far enough to just barely kiss the valve stem/.Would you suspect a bad/broken lobe on cam shaft?
Bad camshaft that happens a lot with these plastic cams especially if the engine has been overheated or ran low on oil
Bad tapper or cam
@@connorssmallengines6663 tappet broke cause valve was stuck
With each stroke of the piston I noticed that the flywheel magnet passes the coil. Does this mean the spark plug fires at every stroke?
Great, observation! That is correct, it will spark on every revolution. Of course it only NEEDS to spark on the power stroke, but I believe this was the simplest way to make it for Briggs. The extra spark really doesn't affect anything.
It's a wasted spark engine.
It sparks at the top of the compression stroke and at the top of the exhaust stroke.
Good job!
I like when BLOGGS AND SCRAPPEN ENGINES ! GO STRAIGHT ! INTO THE MEATAL SHREADDER !! LOOKS ! SO ! BEAUTIFULL !
Just what I wanted to see
Really well done vid
Very good, sir.
Great video!
Great video👍👍
How does that governor thing i keep hearing about work in relation to the camshaft and how does the oil get up to the rocker cradle on a overhead valve engine?
How many hours would a plastic cam engine like this last?
Where would the spark plug be to ignite the fuel mixture?
Good video !
Many thanks, very good explained.
Thank you!
Great video. How did you cut the engine?
A cutoff wheel on a angle grinder and a lot of patience!😆 I'm pretty sure I had the piston out when I cut the cylinder.
Thanks a lot for this educationnal video.
Can this engine run clockwise?
Well, the engine actually does run clockwise. You would refer to the direction of rotation from the flywheel side.
Can it run counter-clockwise? Probably, but the oil slinger would be going the wrong direction and wouldn't sling oil to the cylinder which wouldn't be good 😆. There could be other issues with it turning backwards but that's the only one I can think of off the top of my head.
If the crankshaft spun in reverse, the camshaft would also spin in reverse. Because of how the camshaft's lobes are positioned, the intake-lobe would still allow fuel-air mixture in (during the intake-stroke). BUT then the exhaust-lobe would immediately allow that mixture to exit out the muffler (during the compression-stroke), leaving nothing for the spark to fire.
How in heck did we get a plastic cam shaft.
Very helpful thanks
Great info
Thanksssss 🥳🥳😘
hello if it is extremely hard to start a chain saw using starting fluid , what would be the most likely cause?
I mean is it wanting to fire at all? If it's not getting spark then it's obviously not going to run😂
Spraying starting fluid or carb clean in the intake should get fuel to the combustion chamber, so it should try to start. But if you don't have the kill switch on it's also not gonna start... We've all made that mistake before 😆
I will say whenever I work with any 2 stroke engines I try to use mixed fuel instead of starting fluid so the cylinder gets the lubrication it needs
I managed to start it by changing the diaphragm . I was under impression that i was bypassing the carb using starting fluid . I guess not.