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
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!
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.
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
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.
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?
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.
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?
That's correct, one day I may remake the video with more details into the specific engine! But for now this will do 😄 Thanks for watching, I appreciate it!
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
@John Deere Jared Hey, i have this exact same engine, but i don't have the part that has the model number written on it, so could you please tell me what is the model number of this engine? It would really help me out, thanks!
I have a Briggs Sratton engine at home, it worries me that during the compression stroke, the exhaust valve opens slightly, and as I see it, the engine in the video has the same problem, I'm disappointed with this brand.
Good observation! The exhaust valve is actually supposed to open slightly on the compression stroke. It's called the compression release and it will only do that at low speeds to aid in starting. Once the engine has started and is turning a decent RPM, the compression release doesn't "bump" the exhaust valve tappet. Perhaps later on I can do a more detailed video on these sort of details
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.
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.
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'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.
