Mercedes B Class Coolant Delete

[Bassel Hafez]

Hi Everyone,

I am concerned about the coolant leakage, was anyone successful for installing the coolant delete in Netherlands?

 

[negronoir]

Hi, good concern.

I have a Tesla Model S85 which recently has suffered from leakage and isolation failure and it's just now at the garage rebuilding motor stator and doing coolant delete. I have also a MB 250e that is going to go to the same garage at the moment I get the Tesla back for doing the coolant delete.

I live in Spain... Coolant delete and dissasembly/reassembly motor to change bearings (I suffer also from milling noise in the MB) is about 2K €. But if no preventive coolant delete is done and MB motor fails it is better to throw away the car because a reman motor at MB is about 15k €

 

[J0hnsHere]

Hi Everyone,

I am concerned about the coolant leakage, was anyone successful for installing the coolant delete in Netherlands?

Can't you find any EV-focused garages in the Netherlands?

 

[HORÁCIO]

Hi, good concern.

I have a Tesla Model S85 which recently has suffered from leakage and isolation failure and it's just now at the garage rebuilding motor stator and doing coolant delete. I have also a MB 250e that is going to go to the same garage at the moment I get the Tesla back for doing the coolant delete.

I live in Spain... Coolant delete and dissasembly/reassembly motor to change bearings (I suffer also from milling noise in the MB) is about 2K €. But if no preventive coolant delete is done and MB motor fails it is better to throw away the car because a reman motor at MB is about 15k €

Hi,
I have MB B250e and I did the same in last August. Rebuilding motor stator, coolant delete, change bearings and it costs 2200€ in Portugal. I recommend to anyone to do a prevent coollant delete on MB 250e and the others Tesla, like the Model S with the same engine, to avoid change all drive unit (eletric engine, gearbox and inverter) wich is very, very expensive. My car has almost 90000 Kms. and I am happy with it so far.

 

[Bassel Hafez]

I was searching for any garage that install

Hi, good concern.

I have a Tesla Model S85 which recently has suffered from leakage and isolation failure and it's just now at the garage rebuilding motor stator and doing coolant delete. I have also a MB 250e that is going to go to the same garage at the moment I get the Tesla back for doing the coolant delete.

I live in Spain... Coolant delete and dissasembly/reassembly motor to change bearings (I suffer also from milling noise in the MB) is about 2K €. But if no preventive coolant delete is done and MB motor fails it is better to throw away the car because a reman motor at MB is about 15k €

Can't you find any EV-focused garages in the Netherlands?

coolant delete even for Tesla but I couldn't find

 

[Bassel Hafez]

Hi, good concern.

I have a Tesla Model S85 which recently has suffered from leakage and isolation failure and it's just now at the garage rebuilding motor stator and doing coolant delete. I have also a MB 250e that is going to go to the same garage at the moment I get the Tesla back for doing the coolant delete.

I live in Spain... Coolant delete and dissasembly/reassembly motor to change bearings (I suffer also from milling noise in the MB) is about 2K €. But if no preventive coolant delete is done and MB motor fails it is better to throw away the car because a reman motor at MB is about 15k €

This is exactly the reason that I want to install coolant delete as I am concerned that the motor to be damaged if I have a leakage, I have checked the speed sensor and it was relatively dry but I have hear whining in the motor

 

[Jaywlker]

Any shop with a transmission-style jack should be able to do the coolant delete. You might even be able to rent a transmission jack and do it yourself if you are at all mechanically inclined. Good luck! (I am in Arizona so I cannot recommend anyone in the Netherlands.). Good luck!

My car has been running great in the Arizona heat with the coolant delete manifold installed.

 

[asavage]

Hi,
I have MB B250e and I did the same in last August. Rebuilding motor stator, coolant delete, change bearings and it costs 2200€ in Portugal.

If the stator was rebuilt, that is a very good price.

Drying out or rewinding/repotting the stator is by far the most expensive repair one can do on an LDU; usually, it's not attempted because a replacement stator (and the gearcase half it's glued into) can be procured for less cost than rebuilding a damaged stator. I'm not aware of anyone doing stator rebuild in the USA. One firm in Arizona has a process that can dry out and reestablish isolation resistance of a soaked stator, but it's not cheap.

If the rotor can be extracted from the drive unit without splitting the gearcase -- I was able to do that on mine, with the help of a few bespoke tools aids I made for the job -- then replacing the rotor bearings isn't too difficult or expensive. But if the the rotor has been subjected to coolant for much time, the only way to remove the rotor from the gearcase is to disassemble the gearcase, and the labor goes way up.

---

IDK the timeframe when Tesla switched the rotor bearings from steel to hybrid ceramic, but prior to that time the rotor bearings can wear quite quickly from stray induced currents in the rotor, with the ball bearings serving as a ground path. The early units used a sort of whisker brush arrangement (Aegis ring) that was supposed to provide a ground path, but it didn't work. You can have one or both failing rotor bearings and have that milling noise, and not have a leaking rotor seal -- for a while.

 

[Bassel Hafez]

Any shop with a transmission-style jack should be able to do the coolant delete. You might even be able to rent a transmission jack and do it yourself if you are at all mechanically inclined. Good luck! (I am in Arizona so I cannot recommend anyone in the Netherlands.). Good luck!

My car has been running great in the Arizona heat with the coolant delete manifold installed.

I will check if I can do it myself, are their any video shows the steps to install coolant delete in our Mercedes B class, can't it be done only from the side without removing the motor?

 

[Bassel Hafez]

If the stator was rebuilt, that is a very good price.

Drying out or rewinding/repotting the stator is by far the most expensive repair one can do on an LDU; usually, it's not attempted because a replacement stator (and the gearcase half it's glued into) can be procured for less cost than rebuilding a damaged stator. I'm not aware of anyone doing stator rebuild in the USA. One firm in Arizona has a process that can dry out and reestablish isolation resistance of a soaked stator, but it's not cheap.

If the rotor can be extracted from the drive unit without splitting the gearcase -- I was able to do that on mine, with the help of a few bespoke tools aids I made for the job -- then replacing the rotor bearings isn't too difficult or expensive. But if the the rotor has been subjected to coolant for much time, the only way to remove the rotor from the gearcase is to disassemble the gearcase, and the labor goes way up.

---

IDK the timeframe when Tesla switched the rotor bearings from steel to hybrid ceramic, but prior to that time the rotor bearings can wear quite quickly from stray induced currents in the rotor, with the ball bearings serving as a ground path. The early units used a sort of whisker brush arrangement (Aegis ring) that was supposed to provide a ground path, but it didn't work. You can have one or both failing rotor bearings and have that milling noise, and not have a leaking rotor seal -- for a while.

Thanks alot for this details I find it is very useful and most probably I will go for the coolant delete now but not change the bearing as the whining sound is not that bad

 

[asavage]

I will check if I can do it myself, are their any video shows the steps to install coolant delete in our Mercedes B class, can't it be done only from the side without removing the motor?

I have not seen how the LDU is installed in the MB; I own the RAV4 EV equivalent, which is a (mechanically) nearly identical LDU, and like the MB's is a FWD modified version of early RWD Model S: Toyota & MB flipped the LDU around "backwards" to make it fit better for FWD operation, replacing the gears for new ones with a more correct gear angle, and replacing the stator case half with one incorporating a Park feature. So, many gearcase parts are not interchangeable with the Model S, but are interchangeable with the RAV4 EV.

On the RAV4 EV, the coolant manifold can be removed & replaced with a bypass manifold via the right side fenderwell area. I posted lots of pictures in this thread when I did mine. I would think the MB access is similar, but again I have not seen one.

If you're not going to purchase a replacement coolant bypass manifold, the old manifold must still be R&R'd for modification, and the steps are the same, only with more labor (to modify the manifold for a sealing cup).

Finally, if for some reason the manifold cannot be R&R'd with the LDU in the vehicle -- such is the case for the Model S: the entire rear subframe must be dropped out, then the LDU hoisted out of the subframe, in order to R&R the manifold -- then there does exist a coolant bypass method that involved cutting the manifold in half with the LDU still in the car, and installing a plug + custom hose barb adapter. This method also eliminates coolant flow via the flyover tube, though. Opinions vary as to whether this is a Big Deal. I prefer to not block off the flyover tube, but many do.

More information on this is at the thread I linked above.

 

[Isroslav]

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