Hello sir, I have a problem with my automatic transmission on a mercedes w203, It has a hard shift from 1st to 2nd gear when i press the throttle. (When i lightly press the pedal, it shifts normally like 30% of the time) I went to a mechanic and he said that the lines of oil flow are broken and said to replace the whole valve body, and somehow I don't believe thats the issue. I would really appreciate your advice and expertise. Thank you in advance
You are doing a job welldon. My problem is reverse gear not engaging or moving my car Toyota hiace 2004,after loosing the transmission I found the reverse clutches worn out.replaced new ones but still the same result.please what else do I have to do to get it work
That was by far and miles ahead the best auto trans tear down and explanation. I've seen pretty much all the others, even from known trans shops, but your video is by far the easiest to follow and maybe a second view is needed to further finish understanding how it works. You just have that uncanny skill to explain and comically use your families linens to aid you in your clean display of videos......pretty soon not even his grandmother is safe if we keep aiding in his addiction......
@@speedkar99 these "automatic transmissions" are actually more complicated than Saturn-5 rocket engines! So now you have essentially mastered the presentation of the most complicated man-made machinery. I wish you'd also introduce the design of the "failure points" in your videos - Realize that all these clever systems you take apart are also engineered to fail predictively... clutch friction particles plug the super fine "valve screens" ! It is a good game to help extend service life by defeating the built-in failures Bravo 🤗
I agree, I know, and can wrap my mind around engines. I know how it all work. I have tried understanding automatic trans forever. People start talking in my head at some point every time reassembly explanations start. But I watch because I want to learn
I've been a backyard mechanic for 30 years, but automatic transmissions have always seemed like some sort of strange witchcraft. In a single breath you have delivered a 20 minute run-on sentence that completely explains all the mystery behind the automatic transmission! If you don't already, you should consider teaching professionally! Thank you!
I always wondered how automatic transmissions worked. They always seemed super complicated to understand how they work but once I saw this video it doesn’t seem as complicated as I thought. Nice video.
@@fun_ghoul Everyone should go electric vehicle=build 10× more power plants to deliver all the electrical needs for those pieces of over priced garbage.
@@trendmassacre8423 Nice math, Jim-Bob. Sadly for you, 77% of energy is consumed by heavy industry. If it makes you feel better, tho, I mostly advocate for people to use public transit now, or better yet, walk. Try it, you overfed Yank...save on health care costs!
@@trendmassacre8423 wouldn't take anywhere near 10x as many power plants. It would require around 30% higher electricity production, so that's 1.3x as much. And production capacity can be expanded at many plants.
That was an incredible explanation! It will take me watching it a few times again and again for my understanding of how an automatic transmission works to set firmly into my brain, but your quick paced explanation wastes no time as it covers the bulk of what everything does in a working transmission. It is the best explanation I have found on the subject…. Great Job!!
You are truly a wizard including an amazing gift to explain each component with great speed yet at an understandable rate....something like the transmission you're explaining. Fine man.
Incredible stuff, how do people come up with this. The number of skills needed to put something like this together, the technologies, equipment, cooperation between different teams, designs, prototyping. Truly amazing. Then when something goes wrong, people call it stupid junk and throw it out.. Thanks for showing this! I always get an urge to really completely understand everything that goes on something I take apart (like you, I reckon), but that seems impossible in something as complex as this. Imagine just trying to trace out all those channels in the hydraulic maze..
Absolutely amazing. I work in a metal stamping factory now and I'm trying to imagine how each individual part is made and it's just staggering to think about. The complexity of the case casting, the valve body casting etc. The guys who designed this thing are absolute geniuses. When I see this I'm amazed cars are as cheap as they are.
I have a similar train of thought... Everytime I open something I examine it from a manufacturing perspective, and think of the scale of mass production, it's immense!
ATs are really not as complicated as they seem on first glance.. First of all we have to appreciate the fact that with relatively small design differences, all auto transmissions are pretty much constructed on the same principles, with the caveat of electronics that have compacted the design of ATs considerably, when you consider that ATs were first produced when there was no electronics, back in 1948 when the first true AT was installed on production model Oldsmobile, when there was no calculators, desktop computers or CAD software. All designed by hand on drawing boards. So when a team of engineers design a new transmission, they are not designing it grounds up (the planetary gears, Systems of Limits and Fits, Spline housings, shafts, bearings and other machined or stamped parts are pretty much the same with variations in size. The same goes for castings. All aluminum castings are variations of the same thing. In fact CAD systems such as SolidWorks have built in elements for AT design as a standard feature. Anyway, these videos are absolutely awesome and I do hope that one day you will invest in an actual disassembly table so you won't have to sit on the ground for all this amazing work. Good job, man...Keep it up.
Once you have the design worked out, it’s just a matter of getting the infrastructure to build it. That’s why the prototypes cost so much, while the production version-whatever we’re talking about-isn’t nearly as expensive.
Complex and ingenious. If I had never learned about automatic transmissions and I was asked to design one I would probably take a standard transmission and use an abhorrent combination of centrifugal clutches connected to a nightmare of sprockets, chains, shafts, and rods. It would be a mechanical abomination.
speedkar99, are you reading during the filming?- do you practice your speech thousands of times? there is nobody on RU-vid who can speak so clearly and fluently like you? that's UNREAL!
@@speedkar99 My only question is - you make the remark about how making sure the pressure is not too rough or hard on the clutch packs - is that referring to the fluid quality or how hard a person is gassing the car or both, etc.?
It's crazy to me that automakers have their processes so much under control that they can make all these components and still get a markup on them. The wonders of the industrial age.
The engineering behind transmissions is amazing. It's like alien technology. And to think fluid is making it all work by using a torque converter. The minds that worked on building this thing were far beyond their time. How did we go from moving a stick to shift gears to this complicated mess just to remove the stick and have both hands on the wheel. All this to free up a hand. Wow. Aliens! It's a conspiracy man.
“Now I’m going to remove This clutch here, now I’m going to remove this gear, now I’m going to remove this ring gear, now I am going to remove This last spring clip here, now I am going to remove this last gear set here, now I am going to remove this last sungear here, now I am going to remove this last input shaft here, now I am going to remove these last bolts here, now I am going to remove this last planetary gear set here, now I am going to remove this last input gear, now I am going to remove this last reverse gear, now I am going to remove this last ring gear”
Still don't really understand how all the different clutches, circuits, and inputs work, but you did an excellent job describing them step by step. Thank you
I'm a mechanical engineer as well but automatic transmissions have always eluded me. It's mechanical magic. If I sat down with a model and traced out the power flow and calculated the gear ratios I could probably figure out the different combinations necessary to achieve each gear. But it'd take me a while 😅
YOO!, I was actually searching for someone who would teardown a A/T for a demonstration, Man I freaking love the fact you did all this for us, Thank you so much for the hard work, You deserve a ton of Supporters.
The big pistons in the bottom of the case are accumulators that are used to control shift feel and firmness. I prefer a good hard shift because it makes the thing respond faster and it wears the frictions less, but most people don't want to feel the shift at all :/
This transmission does not have any accumulators in the case. The servo piston in the case controls the application of the front band. There is one small accumulator in the valvebody to control the forward engagement feel. Shift feel is completely electronically controlled in this model.
Wow! Mind blown! Not that I understood everything, but you sure have got a knack of explaining things in a simpler way, even if things are as complicated as this!
I went to an auto repair school 50 yrs ago and as part of the final exam we had to take an automatic transmission apart and repair and rebuild a motor. Lucky for me my 57 chevy convertible needed both and under the tutilage of Mr. Sam I achieved a passing grade and got both done. Although it wasn't as complicated as transmissions today. It took me 6 months to learn what i watched in 20 minutes in this video! Good job.
This video is a great testament to human ingenuity. Like others have said below, what an engineering marvel an automatic transmission is and to think there are so many varieties of them out there that have been designed, developed and produced, is mind-boggling. Also, as others have said, you are a great narrator!!
Love your videos, excellent for the diy mechanic or anyone who is curious! Excellent presentations and you get right to it, thank you for taking the time to teach people!
This guy is amazing! Automatic transmissions can be very complicated but this video does a very good job of giving a general overview of the whole shebang in a short 20 minutes. Entertaining and informative. I wish he could work on my car!
Probably the best explanation of how the auto transmission works on the net. Simply superb. I am a professional Chemical engineer and have worked on cars all my life but understanding the automatic transmission still makes my head go in circles. For me the icing on the cake was the explanation about the transmission pump which no one else ever had done and I kept wondering where is the pump. It was important for me to know if its a positive displacement pump thus meaning you can't run it dry if you want to replace the fluid by keeping the engine running and using the tranny pump to discharge all of the approx. 6 quarts and then replace it. Replacing the oil with a dead engine only gets approx. 2 quarts out. Your tear down seemed like a GM tranny, would love to see a ZF tear down which will be similar to AISIN of Japanese cars. Love your review style sparkled with infrequent jokes & sarcasm.
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7ptkLEZIn84.html dipstick transmission flush machine in action - it puts in 2 quarts and then takes out 2 quarts - I had this cycle 20 quarts for a 11.5 quart transmission.
When I got the notification about automatic transmission video my reaction:- 😀 At 2:25 :- 😠 At 6:22 :- 🙊 At 18:22 :- 🤦🏻♂️ 😩 During whole video 😧😮😳😲😱😨😰😰😳😱😨😱😰😮😧😲😳😰 Soooo much informative and detailed video, I wish I could learn all these mechanicals from you personally and definitely stealing that stuff from your family members 😂😝😂😝 Thankyou brotha, keep growing 🙋♂️
Transmissions are so intimidating to work on because not only is it so many parts, but it’s so many parts and every single part has such an extremely important function lol
I have to echo others here. This is by far the best explanation I've ever seen of how an automatic transmission works. Very clear, very comprehensive, and very funny. Kudos speedkar99!
You have explained one of THE most technically sophisticated and wholly underappreciated modern marvels such that just about anyone can understand! Not an easy task! Except for you...the Toothbrush Wielding Wizard!
I subscribe right away I hope your channel explode you deserve millions of subscribers for sure absolutely very informative and detailed information for the ones love cars and trucks this is pure gold
It's amazing how all these bits and pieces come together. Designing it from scratch is mind blowing. But I still prefer the old school stick shift. Much more reliable. 😆 thanks for your effort in explaining though.
Never realized a used toothbrush can be turned into such a helpful hand on tool in automotive engineering, it provided a pinpoint precise description in every little component part within Automatic Transmission. Well done!
I know a little about car engines from helping my husband and your simplified description of each component which makes the transmission work has helped me to understand how the automatic transmission works. My VW golf TDI might be toast yet when I take it to a transmission rebuild shop, I will at least know more of what they are talking about... Thanks so much.
Okay... I can't believe you really got your brother's bedsheet.. am sure you had some good explanation for doing that... Just like the way you are good at explaining how the whole vehicle works. I love this
I've been struggling to wrap my mind around the automatic transmission for a while now. Probably 4-5th time I've tried watching videos, even this one. But I think this time it finally sank in. Your videos are great!
The torque converter analogy-explanation I found most understandable (for me, anyway) is that the impeller is like a fan, and it blows "air" (ATF, or in another sense, power) onto an adjacent fan, which is your stator. In any case, I wouldn't be surprised it SK99 either has a torque converter video or will do one separately.
@@speedkar99 Speaking of Corollas, I've had this recurring vision of an 03-08 with rear electric hub motors from China and a lithium battery cribbed from a hybrid, iMiev, etc. Stick gives certain advantages, but for ease of operation, automatic would be bomb (plus they're more robust than the sometimes-problematic C59 clockwork). And if there's a shitbox I like better for this idea than the 'rolla, it's a 02-06 Camry 4 cylinder. Someone with two nickels to rub together, please do eet!
A big thanks for detail explanation, I'm a mechanic but never opened an automatic gearbox with someone who could explain me like you just did, I've done many oil and filter changes on 5hp, 6hp, and dsg 6 and 7 gears. Thanks once more, I have hit Like and Subscription. :)
Fantastic as always. Are the detailed diagrams from the manufacturer's repair manuals? I assume they're quite pricey. Very interesting to hear you do this unscripted but with three takes on average. I had to use a script and it still took three takes. Glad your brother got a cameo. I'm surprised he doesn't speak up for himself more. I'm a surprised that there's still a maze-lile hydraulic circuit in these transmissions, despite all the electronics. I had assumed the maze was used only for making the decisions about when to shift, which the computers took over. Is the maze just for smoothing the transitions, which would otherwise be too abrupt from the on-or-off solenoids?
Fantastic video - thank you. And while I couldn’t begin to repeat everything you said I think I get the general idea. So ingenious I can’t image how these things got designed in the first place!
Sooooo much shit to go wrong and cost thousands to rebuild/replace Lol. even toyota auto start acting up around 300k with all maintenance done. meanwhile a manual with good driving habits will last 600k miles and clutch replaced every 200k. very cheap if diy cos clutch kits are cheap. try rebuilding an auto as a diy. impossible even for auto techs; it is a specialty rebuild item.
looks like speekkar99 just took one apart so he can rebuild it idk. probly not tho. putting this together and making it work smoothly is a whole different story haha
I don't know if anyone can help me with this or not but I have a 1997 Ford f150 4.6 Triton four-wheel-drive the transmission when put in gear starts to grind about where the transmission pan is but will not move forward or backwards or go into park what did I break?
Out of all of the videos that explain that auto transmissions have planetary gears that change the ratio, this is the first one I've found that actually explains HOW that happens. Thank you!
The planetary gear concept with bands dates all the way back to the model"t"... Technology has brought this arrangement from levers for shifting to hydraulics acuated by governers and pressure to finally all electronic.
OUTSTANDING! Thanks so much for making this. My word, you know your craft! Even as a scientist I marvel at the fact humans can design and build these sorts of things - and it is all hidden away!
Years ago I had a used transmission installed and it has always shifted hard from first to second, never getting worse. Would a transmission computer shift pattern reset help? 17:15
Since automatic transmissions/torque converters are controlled by computer and a bunch of solenoids then why they dint use the same computers to use the old transmissions and clutch using also solenoids or actuators to do the same job humans do when change speeds but in a better way avoiding the so called inefficiency of this kind?.
As usual excellent video. I have few stupid questions: 1) @15:23 what do you mean by "torque convertor lock up"? You quoted as the discharge oil from pump goes through these small holes of shaft and finally "lock up" torque convertor. 2) I have seen a "cable" coming from automatic transmission to "throttle body"....what is that? 3) What is the purpose of "adaptor assembly"? Thanks for sparing your valuable time and keep your good work on....
For sure;... The Designer didn't draw this lot up over night;... or... On a Napkin... More than likely a Jumbo Roll of Toilet Paper... Just Amazing & I've got a modern 7 Direct Select Gear Automatic
Hope your brother doesn't smoke in bed with "that" blanket. Underwear, meah stains are stains. Great job. I got lost one gear pack passed the 1st set of clutches. 100000 between fluid changes....ah yeah. Thanks for all your effort. RU-vid needs to double your rewards!
Cool video! The parking/emergency brake pawl also uses a ratchet mechanism which prevents it from engaging if the output shaft is still rotating too fast due to the car being in motion. If you put your car in "P" while driving (which of course is not something you should really do!) then you'll hear a clicking sound which is due to the ratchet mechanism being deflected away from locking the pawl in position.
