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Wheel Bolt Torque

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mpalardy's picture
Warminster, PA
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Joined: January 11th, 1990

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1996 E300 Diesel
1971 280SL

What is the proper wheel bolt torque in foot pounds for a '96 E300D? I remember reading in The Star long ago that the torque value for these wheels is 82 foot pounds; however, the owner's manual calls for 80. I need to know because, during inspection last week, my technician called me and ask who put the wheels on last, because he had a murderous time removing the bolts, three of which had to be drilled out with special equipment (2 hrs. labor).
This problem was the result of a routine tire rotation at a local Tires Plus. I'll be going to them for reimbursement for this labor, and I want to make sure I have the proper torque value. They obviously torqued the bolts way too tight, despite their claim that they always "hand-tighten" the wheel bolts properly. 

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badali's picture
Butler, PA
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2005 CLK500 Cabriolet
1966 230SL
82 or 80 will be ok because

82 or 80 will be ok because there is minor variation when using a torque wrench.  Just recheck them after a ride of a few miles.  I had a problem on my 2005 grand caravan when a few came loose on the drivers front wheel.  2 studs broke from being loose and I almost lost the wheel.  I changed all 5 studs after that.

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1966 230 SL
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Jayhawk's picture
Lawrence, KS
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2000 S500
1970 280SL
I'd do what the owner's

I'd do what the owner's manual says. Mine are supposed to be 110 ft.lbs. and my tire guys thought that was too much, but my dealer SA said 110 is correct. 

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Gene Ramp

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cth350's picture
Rockville, NY
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watch your units


81 pound foot = 109.821 254 11 newton meter

You've both got the right numbers, but Gene, you've expressed it in the wrong unit.  That might well have been what happened at the tire store...

Where 110 pound foot = 149.139 974 72 newton meter, but that's not enough torque to destroy a bolt/nut thread.

-CTH

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editorgary's picture
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Confused units

A wheel with the bolts torqued to 110 pound-feet is going to be a b**ch to remove on the side of the highway on a dark night. That's going to take a lot of leverage on the old lug wrench. Better re-read the Owners manual and have the shop loosen them and then re-torque them to the correct 80 or 82 pound-feet (what's two pound-feet between friends, anyhow?)
A caution, always, when reading the owner's manual for a European car in the modern world where everyone else except us is using newton-meters, and we're still using pound-feet.

Cheers
Gary

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mpalardy's picture
Warminster, PA
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1996 E300 Diesel
1971 280SL
Replacement Wheel Bolts

As a follow-up to the post "Wheel Bolt Torque," my technician put on used bolts that he had on hand to replace the ones broken while being drilled out. I noticed that these bolts recessed into the wheel instead of being flush with the outside of the wheel like the original bolts.
 When a local dealer was contacted to obtain wheel bolts identical to the ones on the car, the parts guy said that they no longer had them available. I found this hard to believe since the car's only 15 years old. Those used bolts replacing the broken ones don't look right at all, since they don't match the rest of the wheel bolts on the car. Are the original wheel bolts whose heads are flush with the outer edge of the wheel available new or what??

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