Mahle SL 1.1/1.2 Re-Builds/Maintenance

[Rafal K]

The SL 1.2 is out in the wild with the '23 Levo SL.

From what we know so far, mountings and connections are all the same. It works with the existing battery and range extender (shorter 145mm instead of 160mm cable).

The motor is slightly larger due to the two piece aluminium honeycomb casing for noise reduction.

New 1.2 motor :

View attachment 113603

Previous (1.1) motor :

View attachment 113607

The torque sensor looks slightly different and you can see the casing on the drive side is thicker.

Hardware wise, from what we know so far, there were only slight changes made to the gears to make them slightly quieter.

There are claims that the new motor is slightly more efficient if used with the same settings as the 1.1 motor. This either means there were hardware changes that we're not aware of, or just with firmware they've managed to optimise the power delivery in a more efficient manner. Though they say they've re-tuned Trail 75% Support/80% Peak power and Turbo 100% support/80% peak modes, so this maybe where the extra "efficiency" comes from. Eco remains the same as previously at 35% support/35% peak power. If you want to use all the new power which is available, you'll need to up peak power to 100%.

Allan Cooke from Specialized (mountain bike marketing manager and all round amazing bike rider) suggested a lot was done on the firmware side, so it might be that the hardware changes were primarily for sound, but the power is from firmware. If that's the case, then theoretically Spesh could offer updates to existing owners, though that reduces incentives for existing owners to upgrade to new bikes.

Updating the firmware yourself wouldn't be easy as the Spesh systems are generally well secured even if you could get hold of the firmware, though potentially a third party could offer a "tuning service" if they knew what they were doing and weren't treading on Spesh toes.

Edit: put better picture of original motor.

Hey
Do you possibly have service manual for Mahle SL1.1 motor? You look like the man of knowledge I cant find any reasonable info on internet and just found this thread- which looks like most detailed info about those engines in whole internet I have 1.1. engine with mechanical issue (I thing clutch bearing is skipping) and where I live - nobody is repairing those motors- so I want to have a look myself- and trying to avoid big mistakes Cheeers. R

 

[Zimmerframe]

Hey
Do you possibly have service manual for Mahle SL1.1 motor? You look like the man of knowledge I cant find any reasonable info on internet and just found this thread- which looks like most detailed info about those engines in whole internet I have 1.1. engine with mechanical issue (I thing clutch bearing is skipping) and where I live - nobody is repairing those motors- so I want to have a look myself- and trying to avoid big mistakes Cheeers. R

Hi,

Sorry, no I don't. I think the ebike motor centre repair the Mahle's and also have partners in other countries. It might be worth contacting them and seeing if they can help.

eBike Motor Repairs & Servicing - Homepage

eBike Motor Parts Repairs & Servicing, (formally, Performance Line Bearings) has become the “go to place” for all your e-Bike motor repairs...

www.ebikemotorcentre.com

Cheers.

 

[Rafal K]

Hi,

Sorry, no I don't. I think the ebike motor centre repair the Mahle's and also have partners in other countries. It might be worth contacting them and seeing if they can help.

eBike Motor Repairs & Servicing - Homepage

eBike Motor Parts Repairs & Servicing, (formally, Performance Line Bearings) has become the “go to place” for all your e-Bike motor repairs...

www.ebikemotorcentre.com

Cheers.

Hey So thank you for your replay. I actually bought repair kit from Italy- which is ebikmotorcentre partner (I didnt know that when I ordered it)
I menaged to open motor today- and it is fairly easy and looks reperaiable-as I suspected- sprag clutch fall apart completly (have no idea how I still could had ride yesterday) i did not finish to put it back together yet as one problem occured- one of new bearings delivered from EMC-doesnt quite fit. i will try to find better fitting one in local shop- or if fail-will put it back on old one- tomorrow morning. I will keep you infpormed if motor will work again. at the moment it looks like "not repairable- buy new" policy from Spec is BS.

 

[Rafal K]

SO. I finished- Motor is working-)) and is working better than new... Quiet as death now. After inspecting inside- i know exactly what is making noise- Sprag clutch bearing- which is transfering torque from cranks to motor axis. it was not enough grease there- and it went completly rusty. (Little lubricant there has reason- it is actually holding all power from cranks) but it was possible too little. So I recomend to everyone who's motor is going noisy- if its after warranty- open it and clean and if necessery replace that clutch bearing. other parts does not show any sign of wear really
Last thing- after service- motor require calibration- which has to be done with specilized service sowtware, I did it at my local Spec dealer. takes 5minutes or less.
All the best!

 

[JimVG]

Thanks for the information, Rafal. Can you give us more detail on the required calibration that you mentioned? Did your local dealer service technician perform it, or did you personally do it? What specifically was involved? The reason I ask this is because we have no local dealership, as Trek recently acquired all (3) local dealerships in our area.

 

[Rafal K]

Thanks for the information, Rafal. Can you give us more detail on the required calibration that you mentioned? Did your local dealer service technician perform it, or did you personally do it? What specifically was involved? The reason I ask this is because we have no local dealership, as Trek recently acquired all (3) local dealerships in our area.

Hey. Calibration has to be done on Specailized service software on Specialized service laptop. It was done by Spec technician. Bike was conected to computer via usb port in TCU unit. then there was message " motor require calibratrion" Calibratrion is done purely in service software- after chosing "calibration"- it is about making couple of stedy rotation of cranks- and that is it. Computer is showing- "calibration complete" and motor is working back.

 

[JimVG]

Hey. Calibration has to be done on Specailized service software on Specialized service laptop. It was done by Spec technician. Bike was conected to computer via usb port in TCU unit. then there was message " motor require calibratrion" Calibratrion is done purely in service software- after chosing "calibration"- it is about making couple of stedy rotation of cranks- and that is it. Computer is showing- "calibration complete" and motor is working back.

Thanks for the detailed reply.

 

[Streddaz]

SO. I finished- Motor is working-)) and is working better than new... Quiet as death now. After inspecting inside- i know exactly what is making noise- Sprag clutch bearing- which is transfering torque from cranks to motor axis. it was not enough grease there- and it went completly rusty. (Little lubricant there has reason- it is actually holding all power from cranks) but it was possible too little. So I recomend to everyone who's motor is going noisy- if its after warranty- open it and clean and if necessery replace that clutch bearing. other parts does not show any sign of wear really
Last thing- after service- motor require calibration- which has to be done with specilized service sowtware, I did it at my local Spec dealer. takes 5minutes or less.
All the best!

That's good to know.
The 1.1 motor in my Levo SL is running quite well so far with over $7000km on it but I have had what I think may be a slipping of the sprag clutch. It's only happened a couple of times but usually when I'm descending and standing up and cranking. Feels like a chain slip but I've got a new chain and cassette, so I'm fairly sure it's not that.
Did you buy the full bearing kit and service part seals?

 

[Rafal K]

That's good to know.
The 1.1 motor in my Levo SL is running quite well so far with over $7000km on it but I have had what I think may be a slipping of the sprag clutch. It's only happened a couple of times but usually when I'm descending and standing up and cranking. Feels like a chain slip but I've got a new chain and cassette, so I'm fairly sure it's not that.
Did you buy the full bearing kit and service part seals?

Hey. It was same in mine. Only started to “skip” pedals occasionally- when very strong kick/stroke was applied to cranks. Then in period of 2months- it become more and more frequent and started to be regular and annoying thing. When I opened bearing- it was completely desintegrated… I couldn’t believe it was working. Answering your question- I bought and replace whole kit- however only realy broken part was sprug clutch. So if you have time you may open motor- then decide what actually has to be replaced. I would say rubber seals has to be replaced for new oneas well -as you may have problem with taking them out without bending them (they are metal reinforced rubber- and fitting tight- I bent them when removing)

 

[ilfer]

Hi there! First of all - thank you all for this thread. I own a Levo SL 2020 and after testriding a 1.2 recently, I was quite keen on the really quiet 1.2 motor. Not because of the slightly more power, but regarding the less noise.
@Rafal K - really great that you mentioned your motor overhaul. It also got noticed in another forum I found via google, where they also posted a guy from italy and his SL 1.1 overhaul, he posted on youtube! He seems to have had a rusty sprag clutch bearing too. As my SL 1.1 is quite noisy too, I think I order that bearing and do an overhaul by myself over the winter...


Best regards from Germany!

 

[JimVG]

To see the closed caption translation from Italian to English, from the YouTube video click the “CC” in the outlined square box at the top-right of the screen. Then click the gear icon to open settings and select “Captions”, then select “Auto-translate”, then select “English”. Now play the video. English translation is now in closed caption in the lower portion of the screen.

 

[Streddaz]

Hey. It was same in mine. Only started to “skip” pedals occasionally- when very strong kick/stroke was applied to cranks. Then in period of 2months- it become more and more frequent and started to be regular and annoying thing. When I opened bearing- it was completely desintegrated… I couldn’t believe it was working. Answering your question- I bought and replace whole kit- however only realy broken part was sprug clutch. So if you have time you may open motor- then decide what actually has to be replaced. I would say rubber seals has to be replaced for new oneas well -as you may have problem with taking them out without bending them (they are metal reinforced rubber- and fitting tight- I bent them when removing)

That great, I think I'll be ordering that bearing an O-rings at least!

Hi there! First of all - thank you all for this thread. I own a Levo SL 2020 and after testriding a 1.2 recently, I was quite keen on the really quiet 1.2 motor. Not because of the slightly more power, but regarding the less noise.
@Rafal K - really great that you mentioned your motor overhaul. It also got noticed in another forum I found via google, where they also posted a guy from italy and his SL 1.1 overhaul, he posted on youtube! He seems to have had a rusty sprag clutch bearing too. As my SL 1.1 is quite noisy too, I think I order that bearing and do an overhaul by myself over the winter...


Best regards from Germany!

Great link, I'll certainly be watching that one!

So good that you can rebuild a motor rather than replacing the whole unit when it's just something like a sprag clutch.

 

[sadzo]

SO. I finished- Motor is working-)) and is working better than new... Quiet as death now. After inspecting inside- i know exactly what is making noise- Sprag clutch bearing- which is transfering torque from cranks to motor axis. it was not enough grease there- and it went completly rusty. (Little lubricant there has reason- it is actually holding all power from cranks) but it was possible too little. So I recomend to everyone who's motor is going noisy- if its after warranty- open it and clean and if necessery replace that clutch bearing. other parts does not show any sign of wear really
Last thing- after service- motor require calibration- which has to be done with specilized service sowtware, I did it at my local Spec dealer. takes 5minutes or less.
All the best!

Hi. Rebuilding the motor myself, and I have a problem with one of the bearings aswell. I can't push the spindle of the chainring through the bearing that is pressed in the driveside motor shell - seems like the seat of the bearing on the spindle is too wide. The spindle goes through to the last groove for safety ring, then it's too wide - unable to press it even with the bearing press, left alone with hands. Did you have the problem with the same bearing and what was the solution? I also measured everything and the bearing is supposed to be 35,00mm inner. The new one is exactly that but the old one and the spindle seat come at 35,15mm. Also wrote to Mahle and Specialized, waiting for their answers.

Thanks, Matic