Re: Tesla Large Drive Unit (LDU) Motor Teardown and maintenance
Posted: Fri May 06, 2022 9:15 pm
How is your car and seal?Boxster EV wrote: ↑Fri May 06, 2022 3:49 pm I could be wrong but I think 56 is the coolant outlet seal.
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How is your car and seal?Boxster EV wrote: ↑Fri May 06, 2022 3:49 pm I could be wrong but I think 56 is the coolant outlet seal.
It’s no longer leaking with the speedi sleeve fitted. However I don’t think it will last long-term.Vsevolod wrote: ↑Fri May 06, 2022 9:15 pmHow is your car and seal?Boxster EV wrote: ↑Fri May 06, 2022 3:49 pm I could be wrong but I think 56 is the coolant outlet seal.
Understood, you'll be fine. Today I installed the motor, but I had to pay $ 50 to an electrician to reset the BMS error (remained in my memory), after the reset I went, I will have to pump the antifreeze and I think what equipment to buy for diagnostics and calibration ....Boxster EV wrote: ↑Fri May 06, 2022 9:37 pmIt’s no longer leaking with the speedi sleeve fitted. However I don’t think it will last long-term.Vsevolod wrote: ↑Fri May 06, 2022 9:15 pmHow is your car and seal?Boxster EV wrote: ↑Fri May 06, 2022 3:49 pm I could be wrong but I think 56 is the coolant outlet seal.
Number 40 is a PARK PAWL = A242270 00 00 - This is on the gear reduction/diff section of the motor, not on the rotor. You're discussing the rotor seal aren't you?Vsevolod wrote: ↑Fri May 06, 2022 4:18 pmMaybe 40 and 42 to see? Item 40 is similar to where the tube is in the Boxster EV photoSuperV8 wrote: ↑Fri May 06, 2022 9:59 amThe Merc B250E uses a Tesla motor, and there are seal's available which you should be able to order/by from any Merc dealer.Boxster EV wrote: ↑Mon May 02, 2022 3:50 pm
I'm not aware of any OE suppliers of that seal. Please post here if you find one!
I can let you know the part number for each from the drawing below - let me know if any look close? Looks like they are £3-£10 so not expensive.
B Class 246 B250E motor
Yes, apparently, they do not have a coolant tube in the diagram (inside which the 30x55x8 oil seal is located), sensor 50 is really located inside the place where the oil seal is installed nearby. I understand that tesla does not openly sell the 30x55x8 oil seal, including for Toyota and Mercedes, or can you check with your local dealership? Do you think it makes sense to make some kind of petition for access to purchase the original oil seal? After all, otherwise Tesla forces (according to its logic) to buy the entire motor assembly, and not to carry out a routine replacement of the sealing elementSuperV8 wrote: ↑Tue May 10, 2022 9:59 amNumber 40 is a PARK PAWL = A242270 00 00 - This is on the gear reduction/diff section of the motor, not on the rotor. You're discussing the rotor seal aren't you?Vsevolod wrote: ↑Fri May 06, 2022 4:18 pmMaybe 40 and 42 to see? Item 40 is similar to where the tube is in the Boxster EV photoSuperV8 wrote: ↑Fri May 06, 2022 9:59 am
The Merc B250E uses a Tesla motor, and there are seal's available which you should be able to order/by from any Merc dealer.
I can let you know the part number for each from the drawing below - let me know if any look close? Looks like they are £3-£10 so not expensive.
B Class 246 B250E motor
Number 42 is = A 099 997 03 45 SEALING RING. Same part number as 44.
Number 50 is the position sensor - which looks like it is next to the rotor seal from the photos.
Number 58 is an o-ring A 027 997 71 45
Have a look here for the actual spec for the Ceimin seals they are selling.
The CTLBDYW = triple seal, both directions & yellow - which must be CM-3965 above.Ceimin® PTFE sealing lips are PTFE compound discs that are mechanically formed to a diameter slightly smaller than the shaft. The forming of the lip creats a shape that takes advantage of the hoop strength of the PTFE compound discs. This hoop strength provides the load that is critical for low or no pressure applications to obtain a positive seal.
Compound Description:
CM-1760 PTFE – virgin, white, FDA approved; Good for gases, slow-dynamic, light-duty and cryogenic application in food and pharmaceutical equipments. Major in food mixers.
CM-1775 PTFE with Carbon Fiber and Graphite, black; Excellent wear resistance and reduced creep. Major in water filters.
CM-1865 PTFE with Glass Fiber and Molybdenum Disulfide, black; Excellent for extreme conditions such as high pressure & temperature and for longer wear life on hardened dynamic surfaces. Major in screw air compressors.
CM-2160 PTFE with special filler, black; Excellent elongation performance. high pressure & temperature and for longer wear life on hardened dynamic surfaces. Major in gear boxes.
CM-3965 PTFE with special filler, yellow; Highly wear resistant in fast-rotary service and on unhardened shafts in low-lube, oil-free rotary service. Major in vacuum pumps.
Maybe someone on the forum can ask SKF about the presence of such an oil seal?SuperV8 wrote: ↑Wed May 11, 2022 9:53 amHave a look here for the actual spec for the Ceimin seals they are selling.
https://www.chenmingseal.com/seals-guid ... ml?lang=en
https://www.chenmingseal.com/product/tr ... al?lang=en
The CTLBDYW = triple seal, both directions & yellow - which must be CM-3965 above.Ceimin® PTFE sealing lips are PTFE compound discs that are mechanically formed to a diameter slightly smaller than the shaft. The forming of the lip creats a shape that takes advantage of the hoop strength of the PTFE compound discs. This hoop strength provides the load that is critical for low or no pressure applications to obtain a positive seal.
Compound Description:
CM-1760 PTFE – virgin, white, FDA approved; Good for gases, slow-dynamic, light-duty and cryogenic application in food and pharmaceutical equipments. Major in food mixers.
CM-1775 PTFE with Carbon Fiber and Graphite, black; Excellent wear resistance and reduced creep. Major in water filters.
CM-1865 PTFE with Glass Fiber and Molybdenum Disulfide, black; Excellent for extreme conditions such as high pressure & temperature and for longer wear life on hardened dynamic surfaces. Major in screw air compressors.
CM-2160 PTFE with special filler, black; Excellent elongation performance. high pressure & temperature and for longer wear life on hardened dynamic surfaces. Major in gear boxes.
CM-3965 PTFE with special filler, yellow; Highly wear resistant in fast-rotary service and on unhardened shafts in low-lube, oil-free rotary service. Major in vacuum pumps.
The CTLBDBK = triple seal, both directions & black. From above there are 3x black options. from the comment from the seller about 'oil flooded' I would 'guess' that is referring to CM-1895 with moly disulfate.
Looking at the state of the pitted surface in the previous photos I would defiantly be using something like an SKF speedi-sleeve.
Hi ! How are you?Boxster EV wrote: ↑Fri May 06, 2022 9:37 pmIt’s no longer leaking with the speedi sleeve fitted. However I don’t think it will last long-term.Vsevolod wrote: ↑Fri May 06, 2022 9:15 pmHow is your car and seal?Boxster EV wrote: ↑Fri May 06, 2022 3:49 pm I could be wrong but I think 56 is the coolant outlet seal.
Hello, thanks a lot for the info. Who do you think we can turn to? After all, someone makes these seals for Tesla, it is unlikely that they themselves
Ceimin seals as I posted previously has this size:
Thank you!SuperV8 wrote: ↑Wed Jun 08, 2022 11:09 amCeimin seals as I posted previously has this size:
This is the one from aliexpress I beileve.
https://www.chenmingseal.com/seals-guid ... ml?lang=en
https://www.chenmingseal.com/product/tr ... al?lang=en
Since Tesla doesn't make seals who makes them for them?Boxster EV wrote: ↑Mon Jun 13, 2022 12:39 pm In my opinion these seals are of inferior quality compared with OE and have not been tested long term.
That is the question. Somebody must know.EV_Builder wrote: ↑Mon Jun 13, 2022 1:10 pmSince Tesla doesn't make seals who makes them for them?Boxster EV wrote: ↑Mon Jun 13, 2022 12:39 pm In my opinion these seals are of inferior quality compared with OE and have not been tested long term.
Johan wrote: ↑Thu Jun 23, 2022 12:32 am Being an "outsider", it is extremely tough to find Tesla's suppliers. My next guess after SKF is the giant Saint-Gobain because they mention Tesla here and there on their website and they are large enough to serve Tesla in the long term. See also this presentation showing a Model 3 on the cover page. I called them and they referred me to Tesla for the purchase of seals . I think that a seal of their OmniLip product line is a good candidate for being the original. See here and here for some very brief test data.
However my fear is that rotor eccentricity and -runout at high RPM and sharp turns, caused by gyroscopic effects and impacts due to e.g. road bumps, will cause any replacement seal to leak quickly because PTFE (low friction; needed for high RPM) is far more prone to creep compared to elastomers (like rubbers), so it does not "follow" the shaft movements as well as elastomers. Small rotor movements (w.r.t. the housing) in radial direction are possible because there is (or seems to be) an elastomer O-ring between the rotor bearings' outer race and the housing (why?). See also the attachment. I said "small", but my guess is that this play is large enough for leaks, see also Figure 2-24 in Parker's Rotary Seal Design Guide for a coarse idea about acceptable misalignment (yes, this is yet another seal manufacturer). Can anybody show that this should not be a concern?
drawing.png
what you call cuts is a kind of thread. There are these seals with a twist to improve the sealing effect.Thay then have a given direction of rotation. This causes problems for the people who let the motor run backwards!Johan wrote: ↑Thu Jul 07, 2022 5:02 am Another data point: I just removed the leaky PTFE seal with brute force from my rev. G Tesla drive unit:
PXL_20220707_011354799_close_up.jpg
Note the cuts in circumferential direction around the hole: These reduce the effective PTFE bending stiffness. Consequently, (maybe) there is less pressure from the seal on the shaft as compared to a seal without cuts. I say "maybe" because PTFE is known for its creep, reducing stresses in the long term, partially depending on the additives. I have never seen this feature in any catalogue (but I am a novice so that sais nothing). The Ceimin seals that I purchased (a brand owned by the factory Chenming in Ningbo, China) do not have cuts. So the presence of these cuts may be unique way to identify the manufacturer.
See also for the painful details: Removing rotor and leaking seal from Tesla LDU
@Boxter EV: do you have a photo of your old seal?