Grinding Gearshift Explained
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- Опубліковано 28 вер 2024
- • Jemal's Blog: cooperroadmini... (Jemal shows LOTS of answers!)
Here's what happens inside the transmission when you get a hard gear crunch on shifting. In our case, it's 2nd gear, so I show the worn out synchronizer ring and explain exactly what causes "grinding gears".
My life makes sense now.
JAJAJAJAJAJAJA👌👌👌
@@fernandovillatoro1252 shut up
Same.
It's refreshing to see a video this clear in what's actually happening. Thank you for explaining
Done two years in college studying motor vehicle, and one of my main assessors failed to explain why sometimes the gears screech or find it hard to connect, but your explanation was Brilliant, thanks for sharing this video buddy.
Thank you Dave! After all these years this video is the one that makes sense with almost all types of cars, not just our favorite old Mini Coopers! I always try and explain things in a way that does not require the viewer to be a professional mechanic!
This has to be the best video for describing the function of a syncromesh, and I've seen a few. Top video mate.
Now i understand why you have to pull your leg off of the clutch slowly. the clutch part is to make it so it got up to speed slowly while applying gas to it all. it makes sense now. thanks for the tip.
Super thanks for your video. This is the best video about how behave a syncro worn out
This finally made me understand exactly how the synchro ring do their thing.
Grinding gear changes equals worn out synchros usually. Life makes sense now! Thx
straight to the point I love it.. great video. if someone can't understand that they shouldn't be watching any car videos lol
I feel like I just got smarter after watching this video. Thanks !:
I take my hat off to you. Fantastically explained as to why my Mini gearbox crunches. But why does this seem to happen so much with Mini gearboxes between 2nd/3rd?
What a great expxlanation and demonstration. I never understood it but but this make perfect sense, thank you sir.
thank you very much for breaking this down to my level lol
Perfect explanation! that hand held gear explanation was perfect. Thanks!!
How are they .... new?
well explained and talked through properly thanks, my vans gearbox is needing the synchro fixed now I know what they will be doing thanks
great video. jumped straight to the point and was perfectly clear.
Thank you for this!
I would love to know WHY my trans sometimes doesn't ingage into 2nd, and falls into false neutral, ESPECIALLY with how you just explained syncros.
Thank you for what you do!
Now I finally understand what's going on with my T56 when cold... makes sense.
Thank You for uploading. Needed to see it to better understand.
I agree with everyone else. You did a great explanation I had seen some other ones and had no idea what they meant but you did it very well. Thank you.
finally someone that knows what hes talking about
Ah, nice to finally understand what exactly is going on with the problematic 2004-2008 era Honda 6-speed transmissions in third gear.
This was an awesome explanation I appreciate it a lot!
Thank you for the informative video. It's pretty simple. I thought it was something really complicated!
I seem to be getting some weird grinds on my RX-7 FC now and then on upshifts for no reason. Clutch is all in too. They've stopped happening lately. Currently it happens when I mess up on downshifts because I go too fast through the motions and sometimes the gear stick doesn't go into place as fast asI expect it to. I usually get them right though. Gonna take it a bit slower.
KoopaXross. Rev match and solve your problem. Jamb it and pay.
Great explanation! I was having some transmission problems in my vehicle, getting an intermittent crunch when shifting from 3rd to 4th initially. Took it to a shop, they claimed to have fixed it, but even after returning to the shop for adjustments two separate times the crunching still persists. Now it likes to crunch sometimes when down shifting from 4th to 3rd and sometimes from 4th to 5th. It's strange because the shop can't replicate it and it only seems to happen after I've driven around town for at least 30 mins to an hour. I've tried to dwell longer between the clutch being depressed and moving the gear lever and tried being fast and precise while rev matching, same, sometimes a crunch sometimes no crunch. Any ideas? (They gave me the old syncros from the first shop visit.)
Perfect explanation. Thank you.
I have a 2014 Mazda 3, 6 speed which does that exact thing when changing from 1st to 2nd. It's only done 74000 kms. It's good to know why it's doing it!
I have no idea what any of this means but I watched the whole thing.
Very good and simple explanation.
wow amazing video great description! now i know whats wrong with my bmw 6 speed transmission grinding in 3rd
Nice explanation
Wow! Nice explaination!
How much typically to get new synchros installed? (2nd and 3rd mainly)
Thank you for your info, but my transmission is making that grinding noise on every gear even after putting it in gear and i do not have difficult to put it in gear, is it possible that my sliders are loose or something?
I am as dumb as fuck and this video made sense to me......well explained dude, 🙏
That explains alot... makes sense... thanks for explaining 👍👍
Very good explanation. Thank you.
I get more of a scraping sound after I have shifted gears. for example, 2nd, 3rd, and 4th all make a scraping noise 1500-1900 RPM after the clutch is let go. any higher RPM and the scraping subsides and everything is fine. just really annoying, and I'm not sure why the scrape only persists in that rpm range. any ideas??
currently my 95 yj is grinding in reverse and the majority of my gears all grind. I'm able to shift it while pressing on the clutch and shifting hella fast. Im pretty sure I am doing more damage - if I am understanding your video, to the gears with a bad synchro-ring. 😬 I need help fixing my wrangler.
THIS GUY MAKES BIG MONEY
I have a bad sinchro on my 1st and 2nd gear, but when i double clutch the grinding is great and it goes in gear like in butter, but that is only when im down-shifting
thanks! great vid. so is the only way to fix this is to open the transmission and replace the sync rings? this could be done by any engine mechanic?
will the same thing cause it to kick back out of grear
Has this transmission been experiencing a constant crunchy shift into second? I'm trying to figure out why my car only occasionally grinds gears when upshifting into second and only second.
Me too. Just today. Did you ever figure it out? I'm taking my car 2009 Honda Civic to the shop tomorrow.
Hi just asking i have crv 99 model manual the problem 5ft gear is grind
So could this be the problem to a gear that goes in but gets knocked back out when I rev it? I find double clutching helps
Thanks for this video. May I ask you some questions? When both input and output shafts are not moving, clutch pressed and car at rest, what ensures the alignment and the synchronization between the sleeve teeth and the blocking ring teeth or between the sleeve teeth and the gear teeth? Can those end up to a point-to-point condition and impede the engagement or the chamfer on the teeth will always make them sliding sidewise?
so you'd have to change out the synchro and the gear if both are worn out or damaged right?
Sorry
i missed this... Usually the gear is fine as long as it wasn't allowed to crunch for long after the synchro wore out. You won't know till you get in there and inspect them...
my Suzuki Esteem g15b Have a manual transmission, and its gear box is making stupid sound, ( Tik Tik sounds on first and 2nd gear, 3rd and 4th run smooth, 5th dis-engage when i pull my foot back from accelerator. Can you define what the problem Please.
So if there is only 3 slots to make it line perfectly how do you make it get it to line up
Great explanation
Having a problem on my Mustand GT from second to third. This helps a lot. Wonder if I can just replace the on synchro, or just do them all.
Most of the time you'll wear the one that gets used the most for down-shifting depending on the kind of diving.... but synchros are usually MUCH cheaper than getting to them! Once apart, inspect very carefully and change anything needed so you don't have to do it again!
How much would it cost to change those?
So what happens, if it's not replaced or fixed.....can it lasts for years like this....any takers to this question, thank-you for any replies... 👍
It actually can last for years if the driver understands mechanical sympathy! You can shift patiently and gently, and even use another gear’s synchro to help. But it will do more damage to the gear and shift collar the longer it has to crunch!
Fantastic explanation !
My 3rd gear grinds after I blew my clutch and drove home on that one last emergency trip home. Now I just skip 3rd entirely, 2nd to 4th 😅
Once it's in gear you are not wearing the syncro. I have a video where I show you how to shift using another gear's syncro...
Watch this one to see how I gently shift to 2nd...
ua-cam.com/video/lUOPLFWa7Pw/v-deo.html
@@JemalCRM thank you so much, I will try this asap
ok so i have a 98 honda civic and it grinds constantly while in gear. would this be the same problem? can any one help?
If I've got a worn synchro, Would it simply grind when going into a specific gear? In my situation, my car seldom goes into third. Either it will grind and refuse to go into gear, or it will go into gear. 90% of the time it refuses to go into 3rd gear, and I'm forced to skip straight to 4th
Yup, each gear "has it's own" synchro. Grinding is a result of "forcing" when the gears are NOT synchronized. There is no harm in "skipping" a gear! I also have a video where I show how to use another gear's synchro to help shift one that is worn.
ua-cam.com/video/lUOPLFWa7Pw/v-deo.html
So what happens if I keep driving my truck while it grinds gears can I eventually cause major damage to the transmission
Can I drive it and just skip gear2? My mechanic has ordered a new gearbox but won’t arrive for about a week
Theoretically yes. I skip to gear 4 in my Camaro to save gas BUT… and this a huge but because my Camaro is tuned to skip to 4th gear from 1sr or 2nd for gas economy so maybe it’s an exception.
I’m going to suggest if you attempt it and your car is not tuned for that you should rev your RPMs high when shifting up from 1st to 3rd. That way you can skip 2nd and land on 3rd without stalling or experiencing and jumping/jerky motions.
Personally I’d just wait for the new gear box.
Good explanation!
So I'm grinding when I shift into and downshift to 4th gear, how much would fixing something like this run me?
I was riding my dad's four-wheeler and came to a stop bc there was a truck and me and my cousin were gonna let it pass and I turn off my four-wheeler bc all I hear is the gears grinding I was like oh shit but after it ran normal idk if it was just that one time or if something is wrong with it hopefully just the one time
Understandable explaination thanks
so if I have a problem like this there is 3 parts to replace:
1. the gear itself because the synchro teeth are worn on it,
2. the synchro ring because its so worn that its not pressing on the cone surfaces and therefore its not synchronising the speeds,
3. the sleeve that slides over the ring and onto the gear, because thats worn as well.
is that correct?
Most of the time, only the synchro ring needs to be replaced... unless it has been grinding for a long time, or had other problems like jumping out of gear under load. You must inspect carefully upon disassembly, then decide.
@@JemalCRM Wow thanks for the quick reply even though this video is not recent! There is not many videos that explain how synchro rings work as clearly as you did!
I have a 2016 audi a5 with a 6 speed manual which has trouble getting into 1st gear sometimes, but not all the time. I press the clutch in and try to go into 1st but it only goes in half way. At this point I have 2 options:
1. slip the clutch slightly and it will drop into gear (getting the shafts rotating somehow helps I guess)
2. put it back to neutral, release the clutch, then press clutch again and this time it will go into 1st most of the time (getting shafts to rotate into a different position?)
I am really confused what's going on here because at no point do I hear grinding sounds. and when it does go into gear, there is no clunk sound or anything. Do you have any ideas? If it was a worn synchro ring , I would hear grinding wouldn't I?
@@lukaszM46 Actually, you can have a worn 1st gear synchro with what you describe, As the main shaft is not turning when the car is stopped, you don't get that same crunch. The synchro must bring 1st gear, and thus all the gears to a virtual stop to engage a gear when the car is not moving, or barely moving. Remember that with the engine running and the car in neutral, the transmission gears are turning at engine speed. When you step on the clutch, you disengage the engine and the gears will slow and eventually stop. When you press on the shifter, the synchros "speed up" the stoppage.
Try engaging another gear first.. such as second gear, then slip back into 1st (without releasing the clutch). And avoid revving the engine and spinning the gears even faster.
You might try changing the trans fluid to a slightly heavier viscosity if the car has lots of miles. Or a thinner one if you are in a cold climate.
@@JemalCRM I have tried some more
When the car is standing still it is problematic when I try to shift into 1st right after pressing the clutch. Goes in half way, no grinding or bad sounds.
In comparison, if I press the clutch and wait for a few seconds and then try to put it into 1st, it goes in fine.
So it sounds like the input shaft needs to stop rotating inside the box, and then 1st goes in without problems.
In the case of going into first, the output shaft is not rotating, so the synchro needs to completely stop the input shaft rotation to synchronize the speeds, and apparently it is not doing a great job at it.
I understand that there is no clunking or grinding sound because the shafts are not rotating when the car is still, but even when I rev the engine a bit and then try to put it into 1st, there still is no grinding, so that's confusing, because this is creating a condition for it to happen.
Going into a different gear and then into first without releasing the clutch is not much help since it takes the same time to press the clutch and just wait a bit.
@@JemalCRM forgot to mention this is only problematic when cold but when the car gets up to operating temp the problem mostly goes away
Hi my car was grinding when I accerated during uphill and my engine check light was blinking on my deskboard but went off after grinding. It didnt make any sound it was just shaking and it wasn't almost feelable for the passengers. Could it that I didnt shift to the second gear and so the accerating is not enough. What could be the cause of this and how bad could it be??
Really a lot of help thanks so much!
If you slightly about to shift into 3rd and hear and feel a grind (didn’t fully shift into 3rd) and shift out quickly, is that bad?
Most transmissions will grind at times without anything wrong, say if the clutch wasn't timed quite right, or you change you mind! Most will grind a bit into reverse, which usually has no synchronizer ring. Most will grind if you try to shift too fast. Does not necessarily mean something is wrong.
You did a real good job explaining it, thank you! Do you know what could cause the synchronizer to wlbecome worn out? Perhaps leaving it in a gear too long or something like that?
i Think these rings all gets worn out sometime. but maybe its because the 5th gear spins faster thus wear out faster
Lexis Rez. It is very simple. Many people refuse to rev match. If you do not rev match and jamb your transmission your syncros will allow this, but you will experience premature syncro wear. My transmission always lasts the life of the car.
Very good explanation thank you
you sir is a lesson
I just bought a car that makes a crunching sound on 1st gear as im releasing the clutch and giving it gas, Im going to rebuild it but is it the same issue? Is there a synchro for 1st gear? Or is it a bearing?
Does that mean its not me that sucks at shifting?
Oh that’s perfect, in the den right on the card table lol
Happened to me using reverse hmfp 2x how to avoid it? Need to floor the clutch right?
No, reverse has no synchronizer ring, so you can either wait a couple of seconds, or shift into another gear first to stop the shafts from turning. Just about all manual trans cars will grind a bit into reverse if you are impatient, so nothing is wrong!
Thank you for this video
Superb explain
I have a 2003 ford mustang v6 5 speed and I can't put in 5th gear it just grinds really bad do I need new synchros???
Juan Frias. I would just double clutch it in, and save some money. When you sell it tho' you'll have to dig deep...
GodBless you Sir!
Great video, thanks!
what brand gears are you gonna use?
Well explained.👍👌
Great video
Usually how much to replace this?
Ahh makes a lot of sense now thank you
Nice video!
Exdelent explanation lot of thanks
Thank you so much
What made it have a gap?
Adam Kue just normal wear and tear. People who go into neutral through turn, then slowly let the clutch out end up working their synchros much more than somebody who downshifts and rev matches through corners.
What happens if I don't fix this?
Now there's a good question Jacob! You can drive for quite a while if you can be gentle with that gear, even skip it when conditions allow. What happens every time you get a hard crunch is that you do more damage to the gear itself at those little engagement teeth. Little chunks break off and get in the oil... and in the bearings, and in the meshed gear teeth, and the other gear synchros.
You can use another gear's synchro sometimes... I show how in another video testing a Mini with a bad second gear, but that just isn't practical in any normal driving. You can get good at RPM matching and shift patiently, and put off an overhaul for quite a while.
Not heroes wear capes!
Um, ok
Man that was great, Thanks!
great vid! learned alot.
good job...
good video thanks,
thanks
If the synchro clearance is off, can you get a rattling sound?
+Mike Studmuffin Okay?...and why?
I just got done with a transmission class and I still didn't understand how the synchros exactly engaged gears and where the 'grinding' sound comes from if the gearsets are always in mesh already. My teacher failed to explain this, but you did it perfectly well. Just wanted to thank you. Great video, perfect length too.