Once in a blude moon, our Mercedes 2008 ML 350 has gotten "stuck" in low gear where re-booting the car (off/on) fixes the issue. Asked the dealer what the cause could be. They said, "likely the valve body, maybe easy fix with new solenoid, etc.". I had no idea what a valve body was or how it worked. Found this video and, tada!, wowza!, great tutorial! Muchas gracias! ( I noticed you using the Spanish phrase, "muy bueno" in another vid ;) ).
Had my 1997 toyota Corolla transmission rebuilt, I was there to watch the guy rebuild it and he changed the clutches but didn't touch the valve body. Now it slams into reverse, I'm thinking about a diy valve body cleaning because I do alot on my car myself, but it's quite intimidating. But great teaching
This was great. I' having a late and hard shift from 1st to 2nd, I think it is a valve issue as I already changed out both shift solenoids. Very clear instruction!
Great vid man , question, i have a 2000 excursion with the 4r100, after i tow my boat to the water 1 hr away, when i go into park then shift to drive it is super delayed or not at all. Could i replace the accumulator valve body main valve body and solonoid valve body and filter could possibly fix my problem? Regular driving is no prob at all and trans temps dont ever go over 180 degrees. Thank u
Very fascinating subject. I've got a question to ask. Will the springs at the end of these spools become fatigued over the years and cause shifting irregularities, let's say in the 2-3 clutch circuit, which then sets a fault code?
I've always wondered this as well. Supposedly it's not really an issue. The valve springs don't stroke that much in relation to their total possible travel, so they don't loose tension over time. One would sure think that with heat and years of use that they would though.
Great video and insightful! Got a quick question: in my 2015 Hyundai Genesis g80, no DTCs, TCM updated, ATF changed multiple times, all solenoids replaced, wiring harness and Transmission speed and temp sensors replaced, however I still get harsh up shift from 4th to 5th gear only, and sometimes from 2nd to 3rd gear. They are operated by 35RC solenoid which is already replaced. Could the problem be inside the valve body? What do you think? Thx!
06 Nissan maxima. I'm having hard shift from 1-2 and 2-3 and down shift. Reverse jerks pretty bad. New OEM camshaft sensors worked temporarily. Poor fluid pressure or stuck/faulty solenoid maybe?
My Toyota rush 7 seaters year 2022 having problem. It delay on reverse for 2 to 3 seconds then have a shock and move to reverse. What could causes this please?
The valve bodies are cast aluminum. Most valves are anodized aluminum, but some are machines from steel. Older transmissions commonly used cast iron valve bodies.
@@siuautomotive Thank you very much. Could you recommend any resource about hydraulic valve body materials and manufacturing process. I appreciate for your videos.
I don’t think my transmission pump on my Mazda Tribute works because I checked the hose to the radiator starting up I don’t see any oil coming out also oil came back to where I put oil in
What do the valves pressurize? How do they pressurize and how is pressure created? Where does the transmission fluid flow? Is it directly injected into the clutches somehow?
Did you check out all of the videos in the basic series? The oil pump generates the pressure and it’s driven by the engine via the torque converter. The valves direct or modify this pressure to where it needs to go, such as the clutches , lubrication, torque converter, etc.
possible when i driving cold gearbox oil my car shaking 5 minutes ?? and when i put reverse gearbox he sleeping 2 sek and driving which noise like grinding
If an automatic transmission is to skip/shudder for a second then re-engage in first gear, what could be the problem? Is it commonplace or a regular procedure to individually test solenoids?
Regarding skip/shudder, that is usually due to low pressure applying a clutch from leaks in the clutch circuit. Regarding solenoids, It really depends on the application. Many will ohm check solenoids, replace commonly faulty solenoids, or blow air through them and energize them.
Great explanation on what is going on in a valve body. This is a very simple introduction to the idea of a spool valve: th-cam.com/video/CQPwvWXbV3w/w-d-xo.html. You point out which ports are supplying line pressure. My question is given a random valve body dropped on the bench- is there some way to decipher/trace that flow? Or do you need a schematic to figure it out?
Hi, I have a problem in my A/T that confused many mechanics: At first start only, R direclty engages as normal but DRIVE does not unless engine is running for like 5 minutes and a push on the throtlle, and it engages with a bump, while reverse engages immediately and smoothly. They said if it is a solenoid problem, both D and R will have the problem, any opinion?
I'd have to guess it's for more accurate control and because it's probably easier for a transistorized circuit to modulate vs. vary an analogue signal. Most variable voltage circuits are inputs, like position sensors. Most output circuits are simply ON/OFF or modulated, like injectors, coils, and all different types of solenoids. I'm not an electrical engineer, but that's my best guess.
Yes, the lower resistance solenoids typically don’t get pulsed at more than 50%, so putting them straight to battery power would put more current through them than intended. With that said, I’ve powered them up with 12v for a short time without problem
I'm not sure I know what you mean. If you mean, could they have solenoids that are always normally open (or flowing with no power), then yes, they could. If you mean open as in "not enclosed into the transmission," then yes, there are some transmissions that have the solenoids external to the transmission, like many Honda 5-speeds and the Honda 6-speeds.
Tnx for genuine knowledge, i really enjoyed. As automotive master technician i request please keep going .
siu automotive was 1 of most underrated tutorial videos in youtube 😔. hopefully more people coming over to appreciate the videos.
I have been binge watching:-) I had so many questions about automatic transmissions, and this channel has answered many of them.
World class and second to none, Thanks a lot for this quality training.
I'm loving all your videos !! At 45 years old and now REGRETTING NOT taking these classes in school!!!
I wish I had a teacher this talented...🍻 Priceless..
Once in a blude moon, our Mercedes 2008 ML 350 has gotten "stuck" in low gear where re-booting the car (off/on) fixes the issue. Asked the dealer what the cause could be. They said, "likely the valve body, maybe easy fix with new solenoid, etc.". I had no idea what a valve body was or how it worked. Found this video and, tada!, wowza!, great tutorial!
Muchas gracias!
( I noticed you using the Spanish phrase, "muy bueno" in another vid ;) ).
Brilliant video on how valve bodies work, thankyou so much really helped me understand this difficult subject.
Awesome explanation. As an electrical engineer, I could even understand.
Had my 1997 toyota Corolla transmission rebuilt, I was there to watch the guy rebuild it and he changed the clutches but didn't touch the valve body. Now it slams into reverse, I'm thinking about a diy valve body cleaning because I do alot on my car myself, but it's quite intimidating. But great teaching
This channel is amazing 🤩
Excellent explanation. You are a great teacher. Thank you
Thank you very much for your teaching...
thank you for the knowledge shared, good luck always greetings from the city of Medan Indonesia
This is why I love youtube and I appreciate all the info!
What a great videos. Thanks! Really did help me understand!
This was great. I' having a late and hard shift from 1st to 2nd, I think it is a valve issue as I already changed out both shift solenoids. Very clear instruction!
Very good demonstrate.sir thanks alot
Brilliant teacher
Software control is much cheaper than hardware solutions in cases where large volumes of units are to be produced.
Awesome sharing ❤️❤️
Great vid man , question, i have a 2000 excursion with the 4r100, after i tow my boat to the water 1 hr away, when i go into park then shift to drive it is super delayed or not at all. Could i replace the accumulator valve body main valve body and solonoid valve body and filter could possibly fix my problem? Regular driving is no prob at all and trans temps dont ever go over 180 degrees. Thank u
Excellent...so, if any pathway oil dirty or even causes blockage..what the impact to transmission?
What a great video
I was always wondering why my transmission was taking longer to shift when cold, meaning in winter.
Woow you r amazing
Very fascinating subject. I've got a question to ask. Will the springs at the end of these spools become fatigued over the years and cause shifting irregularities, let's say in the 2-3 clutch circuit, which then sets a fault code?
I've always wondered this as well. Supposedly it's not really an issue. The valve springs don't stroke that much in relation to their total possible travel, so they don't loose tension over time. One would sure think that with heat and years of use that they would though.
In general metal fatigues over time especially when you add thousands of thermal and mechanical cycles.
Great video and insightful! Got a quick question: in my 2015 Hyundai Genesis g80, no DTCs, TCM updated, ATF changed multiple times, all solenoids replaced, wiring harness and Transmission speed and temp sensors replaced, however I still get harsh up shift from 4th to 5th gear only, and sometimes from 2nd to 3rd gear. They are operated by 35RC solenoid which is already replaced. Could the problem be inside the valve body? What do you think? Thx!
06 Nissan maxima. I'm having hard shift from 1-2 and 2-3 and down shift. Reverse jerks pretty bad. New OEM camshaft sensors worked temporarily. Poor fluid pressure or stuck/faulty solenoid maybe?
My Toyota rush 7 seaters year 2022 having problem. It delay on reverse for 2 to 3 seconds then have a shock and move to reverse. What could causes this please?
Hello tou are berelians..thank you very very much...good like......👍....👍.....🙏🙏🙏❤❤👌👌👌
Muito bem explicado , show.
Thank you
Thanks a lot❤❤❤❤
I really wonder what are the valve body and spool made of? Also which manufacturing proceses are done with them?
The valve bodies are cast aluminum. Most valves are anodized aluminum, but some are machines from steel. Older transmissions commonly used cast iron valve bodies.
@@siuautomotive Thank you very much. Could you recommend any resource about hydraulic valve body materials and manufacturing process. I appreciate for your videos.
New subs here sir!!
احسنت شكرا لك ❤
Love the Shirt !!!
I don’t think my transmission pump on my Mazda Tribute works because I checked the hose to the radiator starting up I don’t see any oil coming out also oil came back to where I put oil in
What do the valves pressurize? How do they pressurize and how is pressure created? Where does the transmission fluid flow? Is it directly injected into the clutches somehow?
Did you check out all of the videos in the basic series? The oil pump generates the pressure and it’s driven by the engine via the torque converter. The valves direct or modify this pressure to where it needs to go, such as the clutches , lubrication, torque converter, etc.
Thank you sir! I will go back and watch them. Your videos are amazing and extremely informative.
possible when i driving cold gearbox oil my car shaking 5 minutes ?? and when i put reverse gearbox he sleeping 2 sek and driving which noise like grinding
If an automatic transmission is to skip/shudder for a second then re-engage in first gear, what could be the problem? Is it commonplace or a regular procedure to individually test solenoids?
Regarding skip/shudder, that is usually due to low pressure applying a clutch from leaks in the clutch circuit. Regarding solenoids, It really depends on the application. Many will ohm check solenoids, replace commonly faulty solenoids, or blow air through them and energize them.
Great explanation on what is going on in a valve body. This is a very simple introduction to the idea of a spool valve: th-cam.com/video/CQPwvWXbV3w/w-d-xo.html. You point out which ports are supplying line pressure. My question is given a random valve body dropped on the bench- is there some way to decipher/trace that flow? Or do you need a schematic to figure it out?
Hi, I have a problem in my A/T that confused many mechanics: At first start only, R direclty engages as normal but DRIVE does not unless engine is running for like 5 minutes and a push on the throtlle, and it engages with a bump, while reverse engages immediately and smoothly. They said if it is a solenoid problem, both D and R will have the problem, any opinion?
what your experiencing is something called delayed shift
what vehicle and trans do u have?
@@randy1ization Toyota Prado 120series 4L with
A/T Transmission: 5FE
Is there any reason why the solenoids aré
P.W.M. rather than a variable D.C. linear
voltage similar to a Potentiometer ???
I'd have to guess it's for more accurate control and because it's probably easier for a transistorized circuit to modulate vs. vary an analogue signal. Most variable voltage circuits are inputs, like position sensors. Most output circuits are simply ON/OFF or modulated, like injectors, coils, and all different types of solenoids. I'm not an electrical engineer, but that's my best guess.
@@siuautomotive Sounds right to me, thanks for the reply 👍
@@siuautomotive is that why they say that the solenoids can
burn out if D.C. is applied I guess
Yes, the lower resistance solenoids typically don’t get pulsed at more than 50%, so putting them straight to battery power would put more current through them than intended. With that said, I’ve powered them up with 12v for a short time without problem
@@siuautomotive I guess if the current is very very low
it should be ok
transmission valve body located inside gearbox or engine ?
Gearbox
Can a transmission carry open solenoids alone
I'm not sure I know what you mean. If you mean, could they have solenoids that are always normally open (or flowing with no power), then yes, they could. If you mean open as in "not enclosed into the transmission," then yes, there are some transmissions that have the solenoids external to the transmission, like many Honda 5-speeds and the Honda 6-speeds.
how to assemble avanza body valve
looking for someone to work on my transmission chev aveo 2011 automatic *Western Cape*
hello i need for vido like this for gm 6t40
How the reverse works wasn't explained
il n'a pas l'explication en français vrmt?
Ok
Thank you