ctsvette

Just want to make sure I didn't miss anything. The manual says 96 ft lbs of torque for wheel lug nuts. I assume this is for C43 as well, not just C 300. Just want to double check I'm not missing anything.
Thanks!

jonathan358

111 ft lb or 150 nm.

Page 340 of manual.

ctsvette

Must have different manuals. Mine is showing 96 ft lbs on page 364. Here's a copy from online:

threeMBs

Actually wheel lug bolts (not nuts) torque is hardware (wheels and lug bolts) specific rather than model specific. If car is supplied from the factory with wheels requiring "short" 14x1.5x27mm bolts (i.e.: W212 E, C218 CLS, R231 SL to name a few), the torque is 96 ft lbs, but if car is supplied from the factory with wheels requiring "long" 14x1.5x45mm bolts (i.e.: all SUVs - ML/GLE/GL/GLS/GLC etc, all S class as well as new W213 E and C257 CLS) the torque is 110 (111) ft lbs. Never had C, so do not know what wheels/bolts MB supplies (but as I recall W204 had 27mm bolts).

ctsvette

Got it, thanks! Then 96 must be right.

jonathan358

I quoted directly from the MY2018 C-class Coupe Owner's Manual.

threeMBs

Are your original bolts (for the original wheels) 27mm or 45mm?

jonathan358

27.

threeMBs

14x1.5 27mm should be torqued to 96, 14x1.5 45mm should be torqued to 110(111), regardless of what a manual says.

jonathan358

You're wrong, take a look at this torque calculator for fasteners:



This is with standard stainless steel bolts with an 8.8 ISO property grade, can go up with even higher grade materials.

Mercedes-Benz official wheel torque installations are more complex with a torque, angle, torque procedure, therefore, hitting 150Nm is very well possible.
I will follow the instructions designed by the manufacturer, for our exact car and year model, along with industry professional calculations when it comes to torque ratings. No offence!

threeMBs

As I've said before, all MB models with 27mm bolts I had before - W211 E, W212 E, W218 CLS, R231 SL - all had 96 specified in the manual. All MB SUV and sedans with 45mm bolts I had - W166 ML/GLE, X253 GLC, W213 E - all had 110/111 specified in the manual. Why would MB spec W205 C coupe with 27mm bolts with 111 ft lbs is a mystery to me. Using what manual says is fine, and if yours states 111, then use it. Obviously OP's manual for W205 C (assume sedan) states 96.

jonathan358

Newer cars have higher torque specs, the manual that OP posted is for the W204 C-class.

bportner83

With spacers I have a 45mm bolts on my c43 in the rear and not the stock 27mm. So should I take then to 111 and leave the front 96 since I don't have spacers in the front and still using the stock 27mm bolts?

threeMBs

Newness of a car has nothing to do with it. Again my comments are for specs across all MB lines, not just C (as I said, I've never had C).
For example:
R231 SL class (which I had) was/is equipped with 27mm bolts from the factory, and for all SL cars from 2013 to 2020 MY run, 96 is to be used;
W212 E 2010-2015 (which I had), MB used 27mm bolts - 96 torque, but for W213 E 2016-current (which I had), MB switched to 45mm bolts - 110/111 torque.

If you look at factory 45mm lug bolt, you will understand why MB's spec is 110/111. All MB cars I've see, and I've seen quite a few, 27mm factory bolts - 96, 45mm factory bolts - 110/111. All SUVs and S/CL class use 45mm bolts - 110/111 torque, all others that use/used 27 mm bolts - 96 torque.

threeMBs

No, you should continue to use 96 torque no matter how thick your spacers are and or long your bolts are, because your car was delivered from the factory with 27mm bolts calling for torque of 96. Length to torque matters only in reference to factory bolts, since all components are design to handle 110/111 ft lbs torque.

jonathan358

del.

ctsvette

For reference my C43 is a 2021. I just looked at the manual that came with the car (the one that came in the glovebox, not online) . The manual says 96 lb-ft as the tightening torque. I also checked the supplemental AMG guide and it says nothing about wheel torque specs.

jonathan358

My mistake, I guess the facelift models use the same graphics and specs as the W204 I referenced before. In that case, go with 96 lb-ft all around. Length of bolt does not affect clamping force, as long as you have enough threads of engagement you are fine.

threeMBs

A halfhearted acknowledgment of calling my posts wrong. I never said that ANY 27mm to use 96 or ANY 45mm 110/111. I never said nor implied length of bolts affects clamping force either.
What I said is that all MB vehicles equipped from factory with 27mm bolts have 96 torque spec, while all those with 45mm - 110/111. There are no MB cars to my knowledge with 110/111 torque spec when originally equipped with 27mm bolts.

jonathan358

All I have said is that 150 Nm is plausible and that it is directly what was provided by the manufacturer for thousands of 2018 MY models of the C-class. So you are wrong about that.

Maybe they made some engineering changes for some values of the facelifted models that brought the torque spec back down to 96 ft-lb, maybe they just made an error in printing out 111 ft-lb for my 2018. I don't know.

But as you acknowledged yourself, length does not affect clamping force so whether 27 or 45mm bolts should be torqued the to the same amount. I don't regret anything I have said.

ctsvette

Sorry, but this thread has confused me. I haven't removed the bolts for my wheels yet, but I can assume they're 27mm in length. With that being said, the wheels I bought were OEM 19" wheels on the 2019 C43. This is what they look likehttps://ed-parts.com/product/43-amg-...mercedes-benz/ With that being said, my question is would these wheels take the 27mm bolts or 45mm bolts or do all C43's, regardless of wheels come with 27mm bolts on OEM wheels, hence have a torque spec of 96 lb-ft?

////AMG_C43

The new wheels require the 27mm length bolt also. The 96 lb-ft setting is correct.

Boom vang

my 2019 C300 Wagon manual says 111 lb-ft

Silverbird

Strange, I had no idea the torque setting is different between a 2019 C Class Wagon at 111 ft-lbs, and a 2019 C Class Sedan at 96 ft-lbs. The wheel options are similar and GVWR can't be that different.

Looking into more years, i think it may be an anomaly as both the 2020 and 2021 wagon manuals are back to 96 lb-ft

2019 Wagon owners manual (page 364): https://www.mercedes-benz.ca/content...n_Operator.pdf
2020 Wagon (page 422): https://www.mercedes-benz.ca/content/dam/mb-nafta/ca/owners/operators-manual/2020/operators-manual/MY20_C-Class-Wagon_OM_EN.pdf
2021 (page (page 390): https://www.mercedes-benz.ca/content...+COMAND_EN.pdf

@Merc

my 2022 )GLS450 has the exact same