|
|
|
#1
|
|||
|
|||
Broken lug bolts on 1994 C220. Has anyone ever heard of this?
A good friend of mine called me and said three of his lug bolts broke off his rear wheel. He torqued them to spec when he put the wheels on. What would cause this? They are sheared off clean in the hub.
Is there any way to get these out or is it time for him to buy a new hub? TIA, Steve
__________________
1997 E320 1990 Nissan 300ZX Twin Turbo (Stage X+) |
#2
|
|||
|
|||
Time to get a new torque wrench? Hard to see why three bolts would shear at the same time if they were correctly torqued.
If properly installed, it is only the loading created by the wheel that holds these bolts tight. With the wheel off and the load off the bolts, they should come out pretty easily, perhaps with an easyout, our use a punch to drive them round.
__________________
Cheers, Neil |
#3
|
|||
|
|||
The threads may not have been clean when torqueing the bolts.
__________________
95 E320 Cabriolet, 159K |
#4
|
||||
|
||||
Corrosion/lack of thread lubricant?
__________________
'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
#5
|
|||
|
|||
use a reversed drill bit to get them out, that could work too.
xp
__________________
1985 190E 2.3L - a constant project. |
#6
|
|||
|
|||
They were possibly already damaged due to previous overtorqueing by monkeys with impact wrenches. One more cycle and pooof.
Duke |
#7
|
|||
|
|||
Overtorqued bolts would show up with necking at fracture.
__________________
95 E320 Cabriolet, 159K |
#8
|
|||
|
|||
What is necking?
__________________
David 1986 300E Anthracite + ECodes + MB Mileage Award Last edited by d2bernhard; 01-08-2004 at 07:38 PM. |
#9
|
|||
|
|||
Quote:
__________________
2007 C 230 Sport. |
#10
|
|||
|
|||
"Necking" in regard to bolts is the reduction in diameter
at the point of the break, caused by the stretch of the bolt when overstressed. Necking in the back seat of the car, on the other hand, often results in an _increase_ in the diameter of the midsection of one of the participants, some months later.
|
#11
|
|||
|
|||
Ask your tool supplier for an Ultra-sonic bolt releasing tool kit, works like a jiffy every time!! It mounts to the wheel and uses sound waves to slowly deteriorate the corrosion around the lug threads, allowing you to remove the broken studs with a simple pair of pliers.
|
#12
|
|||
|
|||
Thanks for all of your responses. On Friday, we pulled the hub carrier off the car so we could put the new bearing and hub on it. As I was reading on this site, most of the hub assemblies need to be checked with a dial indicator after assembly. Is it necessary to do this with the W202? Is there a crush washer that needs to be set to spec.? Can it just be put back together and torque the new bearing in with the axle shaft and the job is complete?
Thanks again, Steve
__________________
1997 E320 1990 Nissan 300ZX Twin Turbo (Stage X+) |
#13
|
||||
|
||||
looking for supplier
Quote:
|
Bookmarks |
Thread Tools | |
Display Modes | |
|
|