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-   -   drivetrain steps by steps (https://www.fiskerbuzz.com/forums/13-fisker-karma/31201-drivetrain-steps-steps.html)

hydroressources 11-18-2016 11:57 AM

drivetrain steps by steps
 
Hello,

I own an ecochic of 10 000 miles. Bad luck or bad construction.....my drivetrain broke a week ago. I have to admit that its not cheap to change.

As I do have access to several tech and engineers because of my job, I would like to change it myself. However, I feel there are some basic steps to do to avoid collateral damage, such as unpluging HV batteries, etc.

Of course, Karma don't want to tell me those basic steps, as it is so complicated according to them. We are not talking about rebuilding a boeing 747, we just need removing and replacing a drivetrain on a car.

Does someone could help me with the major steps of changing my drivetrain ?

would be much appreciated

Tks, Michael

PowerSource 11-18-2016 02:13 PM

1 Attachment(s)
Quote:

Originally Posted by hydroressources (Post 270809)
Hello,

I own an ecochic of 10 000 miles. Bad luck or bad construction.....my drivetrain broke a week ago. I have to admit that its not cheap to change.

As I do have access to several tech and engineers because of my job, I would like to change it myself. However, I feel there are some basic steps to do to avoid collateral damage, such as unpluging HV batteries, etc.

Of course, Karma don't want to tell me those basic steps, as it is so complicated according to them. We are not talking about rebuilding a boeing 747, we just need removing and replacing a drivetrain on a car.

Does someone could help me with the major steps of changing my drivetrain ?

would be much appreciated

Tks, Michael

Generally speaking..Remove MSD underneath drivers side rear passenger seat then remove rear bumper and then close out panel and cables from inverter then the rear subframe. Pretty self explanatory here is a picture that may help.

hydroressources 11-18-2016 03:57 PM

Tks for this input. Sorry for asking (I'm french), but what is the meaning of MSD ? Any care when we disconnect everything from the inverter ? Any other electrical stuff that I need to take care ?

On a mechanical stand point, I'll be ok. It is more stuff related to batteries that freak me out !

Tks

PowerSource 11-18-2016 04:15 PM

Quote:

Originally Posted by hydroressources (Post 270865)
Tks for this input. Sorry for asking (I'm french), but what is the meaning of MSD ? Any care when we disconnect everything from the inverter ? Any other electrical stuff that I need to take care ?

On a mechanical stand point, I'll be ok. It is more stuff related to batteries that freak me out !

Tks

MSD is the manual service disconnect which is the main fuse for the battery pack. This will "disable" the pack. It is an orange plug underneath the drivers side rear passenger seat. You will also want to disconnect the 12v plug on the passenger side front fender (inside the engine bay).

Once the MSD is removed, you can then safely disconnect the high voltage cables. You will still want to use a Volt meter and rubber gloves to measure the voltage at the cables to ensure that the pack has indeed been disabled prior to any HV work. Good Luck!

Fabulist 11-19-2016 06:20 PM

Quote:

Originally Posted by hydroressources (Post 270865)
Tks for this input. Sorry for asking (I'm french), but what is the meaning of MSD ? Any care when we disconnect everything from the inverter ? Any other electrical stuff that I need to take care ?

On a mechanical stand point, I'll be ok. It is more stuff related to batteries that freak me out !

Tks

You will find some useful information here, including the location of the MSD.

hydroressources 11-20-2016 09:34 AM

terrific guys. Tks to both of you. I'll post some photos eventually for the benefit of others.

Cheers

PowerSource 11-20-2016 11:01 AM

Quote:

Originally Posted by hydroressources (Post 271033)
terrific guys. Tks to both of you. I'll post some photos eventually for the benefit of others.

Cheers


Are you just swapping out a complete RDM unit with motors or are you rebuiding the motors and RDM?

hydroressources 11-21-2016 08:27 AM

Well, depend on the problem. It looks like to be a RDM problem. If so, won't touch the electric motors.

However, instead of changing the RDM for the new revero RDM, I might consider rebuilding it. I can't understand why Karma just waranty the new RDM for only a year. That indicates a lack of confidence on the part !

So' I'l see.

Fabulist 11-21-2016 04:37 PM

Quote:

Originally Posted by hydroressources (Post 271113)
Well, depend on the problem. It looks like to be a RDM problem. If so, won't touch the electric motors.

However, instead of changing the RDM for the new revero RDM, I might consider rebuilding it. I can't understand why Karma just waranty the new RDM for only a year. That indicates a lack of confidence on the part !

So' I'l see.

@hydroressources, There is a known weakness in the connection between the electrical motors and the RDM (search for the phrase "soft spline") which can be addressed in a couple of different ways. Even if your current failure is not caused by this weakness, as long as you have the RDM off the car, it would make sense to address this issue at the same time. Best solution is to get upgraded RDM and upgraded Motors as a single unit and swap them at the same time. I am not trying to spend your money for you, but spending strategically at this stage may help avoid future problems.

hydroressources 11-21-2016 08:40 PM

Tks Fabulist for this input. That is very impressive how the engineers of Fisker did it wrong. That remain very basic mechanics, calculate the torque, the HP, acceleration and shear strength of metal parts. Rotation and torque are common stuff in several applications such as pumps and impeller.

Well, I will put all that out and check for the splines as well. If I see a problem, I'll try to find a way to weld or clip all that together instead of leaving some potential free space.

However, according to what I saw on previous post, noise on decel is more associated with the drivetrain. That is what I noticed before it broke. So that make sense to believe it is the drivetrain.

The post I read was from 2013. So far do you know if some found alternate ways to prevent failure, other then replacing the motors (another 8 000 $ I think)

Tks


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