Bosch CX Gen 2 questions

[sungjae82]

Hi, I have a secondhand 2019 Scott Strike with Bosch CX Gen 2 motor and have a few questions upon opening it up for the first time.

1. Around the left-hand crank shaft(non-drive side), there is a worked-up rubber seal (1st and 2nd photo). What is this and where can I get a replacement?

2. I now know that the felt seal on the right-hand drive-side crank shaft is a big no-no (Thanks to @bearing). Until I get the aftermarket rubber seal, should I just pack grease in its place or use the felt seal?

3. Upon removal of the motor, I can see in 2 spots where the frame looks like it has been worn/ground againt something (3rd photo), but there is nothing on the motor. Would it been like that from the factory to make room for the motor?

Thank you.

 

[Stihldog]

Hi, I have a secondhand 2019 Scott Strike with Bosch CX Gen 2 motor and have a few questions upon opening it up for the first time.

1. Around the left-hand crank shaft(non-drive side), there is a worked-up rubber seal (1st and 2nd photo). What is this and where can I get a replacement?

2. I now know that the felt seal on the right-hand drive-side crank shaft is a big no-no (Thanks to @bearing). Until I get the aftermarket rubber seal, should I just pack grease in its place or use the felt seal?

3. Upon removal of the motor, I can see in 2 spots where the frame looks like it has been worn/ground againt something (3rd photo), but there is nothing on the motor. Would it been like that from the factory to make room for the motor?

Thank you.

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I’m not familiar with the older Bosch Gen 2 motor but there may be others in the forums who are. I have limited experience with the Bosch gen4 CX motor.

Installed a few bearing seal kits (w/grease) over the life of my motor. That probably helped. I keep a spare kit.

I have opened up the motor to replace the drive side casing only after the bracket mount bolts broke. When I got to this point I realized that extra care, special tools and some rebuild experience was needed. If you have nothing to lose …I’d say go for it. But the Motor Repair Centre will have the parts and knowledge to get you up and running asap.

#3- I have noticed some wear marks in the motor compartment area. These look like grinding marks which may have happened during the assembly process to fit the motor. I don’t think they are too concerned about finish or looks at this point of the assembly process. That’s just my guess.

 

[Beaker2135]

You should be able to get the seals you need HERE @Bearing Man website
My guess is that someone has ground that material away to make room for a cable, they are really tight on my Cube in fact I might do that next time I have the motor out

 

[Bearing Man]

Hi, I have a secondhand 2019 Scott Strike with Bosch CX Gen 2 motor and have a few questions upon opening it up for the first time.

1. Around the left-hand crank shaft(non-drive side), there is a worked-up rubber seal (1st and 2nd photo). What is this and where can I get a replacement?

2. I now know that the felt seal on the right-hand drive-side crank shaft is a big no-no (Thanks to @bearing). Until I get the aftermarket rubber seal, should I just pack grease in its place or use the felt seal?

3. Upon removal of the motor, I can see in 2 spots where the frame looks like it has been worn/ground againt something (3rd photo), but there is nothing on the motor. Would it been like that from the factory to make room for the motor?

Thank you.

There is definitely not enough room for a seal on the non drive side of this motor. As you can see from the state of your seal, it has been crushed into the left hand crankshaft bearing. I would be gobsmacked if the left hand bearings seal has not been damaged by this.
We use a stainless steel shim combined with a 0.5mm thinner circlip. This allows for a bearing shield as a bare minimum. As you can see from your pictures, nothing else fits!