Tesla Model 3 - Rear Drive Unit - Teardown - Checking the Damage - P3

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Here I start dismantling or tearing down the Tesla Model 3 Rear drive unit or motor. After splitting the case open we find out what actually caused the catastrophic internal failure. We could clearly see all the gears and gearsets where still in good shape. The case had a hole busted out the top and a bearing race was torn out. After looking a little more closely I found the main bar in the differential gearset to have slipped out of place. The keeper or roll pin holding the main bar in place had sheered off. This caused the main bar to protrude out the gearset and damage multiple components inside the housing. As it spun around enough to break things out of the way the noise stopped and had me fooled that anything major was wrong. I'm hopping this was more a fluke and not a major flaw in the Tesla rear drive unit and should not be common. As Matt said it probably had "One too many launches!"
Thanks for Watching,
Casey

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27 авг 2024

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Комментарии : 34

@ChrisLeiter Год назад

Wow. What an incredible amount of damage from such a small part.

@TeslaRebuilders Год назад

Yea surprised me and yet shouldn't have happened.

@eamonnhenry8161 Год назад

Brilliant investigate work

@TeslaRebuilders Год назад

Thanks for the comment and watching, Casey

@havablast131 Год назад

Thank you for all the awesome content....keep up the great work love watching tesla teardowns.

@TeslaRebuilders Год назад

Appreciate it, thanks for watching!

@garricklankford9980 Год назад

Thanks for another helpful video! I learned that it's possible to take the gearset out without pulling the motor off, but it requires the three gears to come out together (which isn't fun or easy). I'm really surprised that big cross shaft pin walked out. When I was working on mine (2020 version), I tried pulling that pin out after removing the roll pin (you called it a keeper I think) to make it easier for the machine shop to work on. I found that the pin on mine was in there so tightly that I couldn't even budge it with a large hammer, so I reinstalled the roll pin and called it a day.

@TeslaRebuilders Год назад

Yea only reason I think I had so much trouble is because those two big gear sets spun the races and semi fused in. The prybar popped them out though. Yea been wondering why my pin was thrown or walked out of place. Technically those gears don't really spin at high speed but only turn slowly in differential steering around curves. They are not bearing and only have shims or wear rings to ride on. Not sure how load was transferred to the pin and caused it to shear off. Feel like a solid pin or something more permanent would have been better. Thanks for the comment and watching!

@peteroffpist1621 2 месяца назад

Love people with guts

@allan80supra 6 дней назад

Id guess it was run at high speed with one wheel stopped, be it during accident or in salvage someone doing a burnout, not an uncommon failure for an open diff, one of the spider gears starts to weld itself to the pin, spins the pin that sheers the roll pin and then the cross pin comes out....

@georgedailey5596 Год назад

Thanks for the video. That was very informative.

@TeslaRebuilders Год назад

Glad you liked it, thank you for the comment and watching. Casey

@tannerbean3801 Год назад

It looks like at least one of those differential pinions spin freely of the shaft, but it seems possibly (especially if one of the pinions is coupled to the shaft) that in a case of high torque or high accel/decel impulse i.e. in a collision or maybe abusing the drive unit with launches that there could be torque on the differential pinion shaft. If there was enough torque or torsional impulse, that keeper could have been cracked or sheared, then eventually fell out. Alternative scenario I think is less likely is if the shaft was not centered, so at high rpm the diff pinion shaft pulled axially (instead of torqued tangentially). I think that's much less likely than the impulse 'directly' coupled from the wheels & CVs to the side gears, then pinion gears & pinion shaft. Weak link.

@TeslaRebuilders Год назад

That is extremely well explained Theory, kind of what I was thinking but I didn't know what to call it. Thanks for the comment and watching, Tanner

@namenotshown9277 Год назад

nicely diagnoised

@TeslaRebuilders Год назад

Thanks it's definitely more than I expected but at least it was fixable myself quickly.

@loganrossignol Год назад

What's the version of this motor? It might be something Tesla needs to look out for on cars that got this motor or have similar motor build dates if something was assembled incorrectly

@TeslaRebuilders Год назад

I'll have to check the serials but it's a very early 40k Vin M3

@101rotarypower Год назад

What resultant force would/could cause that keeper pin to shear? Can you even speculate? Almost seems like it would have to be a freak occurrence or even when manufactured? How long did it run "just fine" presumable weakened/failed after the front end incident? Thanks for getting a repair community started, its hard to find detailed information on that topic! Details like this are exactly what I am looking for and interested to know about, have not found where they are all hiding yet.

@TeslaRebuilders Год назад

So originally the front end accident was at 19k miles. The rear motor was not damaged from that because it failed at 105k miles. I can only assume the thousands of launches I did in this car on the daily including disabling traction control to do burn outs didn't help! Usually these gears don't turn much or at a very high rpm as the wheels are locked to the ground and traction control won't allow a single revolution out of sync. When it's disabled you can easily apply full power and torque to one side and spin out like crazy. This would definitely put a ton of stress on this pin and gear set. Granted I should have not done these things but the gearset should be a little more durable.

@morbidnine4690 Год назад

Same thing would happen when I was a Chrysler Tech back in the 90's. Similar style spider gears were in the minivan transmissions, held by similar pin. Changed many that let go and put the pin through the case. We noticed in the shop that the transmissions would always fail after a snow fall. Common complaint was for a transmission leak. We concluded it was from one front wheel spinning in the slippery conditions then loading up up the pin when it gained traction suddenly. I also had several dodge dakota 8 1/4" differentials fail in same manner from one wheel burnouts.

@jasonyurrrr9994 4 месяца назад

Hey broski I hope you see me but, I’ve been trying to do research on the rear differential for the model 3 on maintenance but literally nobody is talking about it, should I treat the rear differential like any other and replace the fluid every 60k miles ?

@TeslaRebuilders 3 месяца назад

No need too, it's good for over 200k easy. I just drove the car like I stole it too much and did way too many launches. Don't remove traction control and do donuts I lend the failure to that primarily cause. Thanks for the comment and watching, Casey

@jasonyurrrr9994 3 месяца назад

@@TeslaRebuilders I agree 100% bro but I drive 150 miles a day, I’d think to service the fluid in my rear drive unit every 60k miles right ?

@vehiculoselectricosrd7142 3 месяца назад

I NEED THE RESOLVER FOR MY M3 2018 :(

@TeslaRebuilders 3 месяца назад

Did yours fail? If you swap motors you need to use the one off old motor on new.

@leoniekaczor 6 месяцев назад

keep the engine parts. one day you have a engine which need one of those

@TeslaRebuilders 5 месяцев назад

Yes I still have them and may be repairing a motor I just pulled out of the new donor car to have a complete one.

@tannerbean3801 Год назад

2:20 I'm pretty sure that is a resolver

@TeslaRebuilders Год назад

Yes it is and I actually had to use it on new motor swap because newer version didn't have the winding temp sensor. It gave me the incompatible Drive Unit software code.

@user-ju8rr9rf1o Месяц назад

They are all JUNK! Tesla replaces these units daily and programs them so you dont brick all modules in the car.

@TeslaRebuilders Месяц назад

Yea ok out of millions of cars on the road yes the older model S has motor failures. Very rare on newer models, mine was probably due to the way I drove the car like I stole it and nothing to do with miles on it. It had 100k miles and still looked like new with no signs of wear.

@user-ju8rr9rf1o Месяц назад

@TeslaRebuilders Some Tesla repair shops are behind months from drive unit failures😒The bearings, the coolant system , you name it. I went to apply as a Tech there, but they work you all night and day

@TeslaRebuilders Месяц назад

@@user-ju8rr9rf1o Yea I get that there are few service centers. They are growing as best they can to keep up with demand. The problem is like with any business these days it's hard to find good reliable people. I own a small business and it's next to impossible to get good help. I hope they get better soon.