Carrier bearing preload setting for 215 Axle
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Joined: May 2014
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C63 2012 M156
Carrier bearing preload setting for 215 Axle
Hi Folks.
I am installing a Quaife and need to to re-shim as the backlash went from 0.10 to 0.18mm.
I haven't touched the pinion but I am having to start from scratch on the carrier with a set of ground cir-clips I got from Autotech.
What is the fully assembled preload setting for the 215?
Pinion spec range
Carrier spec range
I am installing a Quaife and need to to re-shim as the backlash went from 0.10 to 0.18mm.
I haven't touched the pinion but I am having to start from scratch on the carrier with a set of ground cir-clips I got from Autotech.
What is the fully assembled preload setting for the 215?
Pinion spec range
Carrier spec range
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Joined: Oct 2008
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From: seattle
1990 300ce supercharged and intercooled
There are no factory specs for this differential or any rebuild procedure from Mercedes. You get a whole differential. You cannot even buy most parts for it. Seals is about it. I have cross referenced some of the newer diffs to older cars that used the same parts but that is a pain and you need to know what diffs came in what car and go hunting.
If you are just adjusting lash then all you need to do is have the total snap ring thickness be the same to have the correct preload. Then adjust the thickness from side to side. So take .04-.12mm off the one side and add it to the other side.
Also if you spread the case to get the snap rings out then you have to be careful not to spread it to far as that can effect your setup as well.
If you are just adjusting lash then all you need to do is have the total snap ring thickness be the same to have the correct preload. Then adjust the thickness from side to side. So take .04-.12mm off the one side and add it to the other side.
Also if you spread the case to get the snap rings out then you have to be careful not to spread it to far as that can effect your setup as well.
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C63 2012 M156
I had to re-shim it as the original carrier had different bearing land settings to the Quaife. I could feel the cir-clips were harder to get in as well so using the original pack total will be too tight.
There will be specs on this just a matter of finding someone with the access... Daimler maybe? The 215 axles are all the same.
There will be specs on this just a matter of finding someone with the access... Daimler maybe? The 215 axles are all the same.
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From: Orbiting the planet
This place is a joke.
Mercedes does not publish these specs to the dealerships, the differentials are "not serviceable" like whipple said. When something goes wrong you get a complete unit, assembled from MB.
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C63 2012 M156
The tech's who put them together will know. I wonder if Daimler is more forthcoming. Dana from Wavetrac is looking into this while we speak.
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From: seattle
1990 300ce supercharged and intercooled
Mercedes shares nothing. They do not even like to tell the techs very much of anything. Even corporate level people really do not have very much access to info. The only way you would be able to find the actual info is to measure it yourself. Like I said you could easily measure the total preload. If the quaife is thicker and all you have to do is put a thinner shim in to reduce the lash on the one side. Measuring was a little easier with the bolt on side covers. but with the c clips you need to measure the original case spread. Measure with the c clips out and the c clips in and the difference is your preload. Make it the same on the new unit. To make this even a reasonable effort you need to order bunch of snap rings and have them knife edged to about .001 steps down from factory. Have a bunch. Because when you adjust preload it will also adjust the lash at the same time. So you need a lot of adjustment to move around back and forth. I used to do a lot of the older diffs and they had steel shim plates and it was a long process to set everthing up.
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C63 2012 M156
Yes, that is exactly what I have done. The cir-clips have arrived but I don't have a engineers flat to get carrier bearing land dimensions from both carriers. I did not measure the fully assembled preload just the backlash on disassembly.
I had a discussion with the Timken manufactures of the bearings and it seems rolling torque for a particular bearing is calculable based on rolling speed, lubrication and cooling. It looks like .2mm preload and around 1.1 - 1.2Nm is the sweet spot for maintaining the tight backlash settings that these units run without introducing excessive heat.
If anyone is doing this job at the moment it would be interesting to see what the actual numbers were on a factory unit.
I had a discussion with the Timken manufactures of the bearings and it seems rolling torque for a particular bearing is calculable based on rolling speed, lubrication and cooling. It looks like .2mm preload and around 1.1 - 1.2Nm is the sweet spot for maintaining the tight backlash settings that these units run without introducing excessive heat.
If anyone is doing this job at the moment it would be interesting to see what the actual numbers were on a factory unit.
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C63 2012 M156
I settled on 0.21mm preload after consulting
http://www.jp.nsk.com/app01/en/ctrg/...sk_cat_e728g_7
http://www.timken.com/en-us/Knowledg...r-Bearings.pdf
This worked out at 1.2Nm rolling torque lubricated starting torque was up around 2.1Nm. The feelometer agreed as well and nice to have the back lash dialled in at .008 - .009mm rather than .018mm. The contact pattern was very slightly drive toe/coast heal but nicely centred vertically and no where near the edges.
I also de-burred the ring gear flats while I had it out. Happy to have bottomed out all the loose ends.
http://www.jp.nsk.com/app01/en/ctrg/...sk_cat_e728g_7
http://www.timken.com/en-us/Knowledg...r-Bearings.pdf
This worked out at 1.2Nm rolling torque lubricated starting torque was up around 2.1Nm. The feelometer agreed as well and nice to have the back lash dialled in at .008 - .009mm rather than .018mm. The contact pattern was very slightly drive toe/coast heal but nicely centred vertically and no where near the edges.
I also de-burred the ring gear flats while I had it out. Happy to have bottomed out all the loose ends.
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From: Kansas
2003 E55, 2003 SL55, 2014 CLS63, 2018 q50 Redsport, 1968 Camaro SS, 1999 Trans am Firehawk
where did you guys get the different c clips? I need some for my 03 SL55 and when I google autotech I just see a website that has VW parts.
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C63 2012 M156
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From: Portland, Oregon
2019 Jeep Trackhawk, 2002 CLK55, 2014 911 Carrera
http://autotech.com/index.php/185wk-...84-4-22mm.html
Last edited by JoeJErnst; Feb 6, 2017 at 02:30 PM.
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From: Portland, Oregon
2019 Jeep Trackhawk, 2002 CLK55, 2014 911 Carrera
They are probably MB snap rings, but they have been machined to varying thicknesses. If you order some from MB they will come full thickness and won't do you any good until you grind them. FWIW, I was able to take .004" off my old ones by hand, but you won't be able to do that with a new one; it's WAY too thick.
