Oil Change Gone Wrong - Page 2 - PeachParts Mercedes-Benz Forum

layback40 · #16 09-09-2010, 08:30 PM

I think all of us who have been there with a damaged bolt/stud will agree that the removal is more an art than a science. Some one could write a good DIY on all the different ways one can try to get the ###### thing out !! We all have our favorite ways.

Bens lover · #17 09-09-2010, 09:50 PM

Quote:

Originally Posted by pwagon

I've always been wary of overtorquing anything on my 85 300d given its age. I'd read on this forum how people had sheared off bolts by accident while doing routine maintenance... Well, it's happened to me. I was snugging up the filter housing bolts and one of them sheared off almost immediately, and the car is undriveable without it.

I've searched low and high on the forum, but can't find a relevant thread. What's the best way to go about fixing this? How do I replace the bolt without damaging or replacing the housing?

Was it something like this????
http://benzguy.piczo.com/wouldyouliketolearnfrommymistakes?cr=7&linkvar=000044

Cheers
Big Dan

pawoSD · #18 09-09-2010, 10:07 PM

Quote:

Originally Posted by tangofox007

I think the mistake here might involve your interpretation of the OP's statement:

My interpretation is that he over-torqued it significantly enough to break the stud.

I believe the tightening torque for those nuts is about 25-30nm, which is hardly anything.

vstech · #19 09-09-2010, 10:22 PM

the nuts on the oil filter housing never need much torque. you tighten it enough to compress the o-ring and it's good. further tightening and the cover hits the housing, further tightening from that, and it's POP of the bolt!

tangofox007 · #20 09-09-2010, 11:06 PM

Quote:

Originally Posted by curtludwig

I'm absolutely flabbergasted by this one. I can't even begin to count how many oil changes I've done and never had one of those bolts break, especially not "almost immediately"...

Have you considered how much pressure is on the filter lid, which is being held in place by nothing but those two studs?

Diesel911 · #21 09-09-2010, 11:47 PM

Quote:

Originally Posted by tangofox007

Have you considered how much pressure is on the filter lid, which is being held in place by nothing but those two studs?

If you calculate the pounds per square inch on the Lid it would not come near the combined Tinsel Strength of the 2 studs.

tangofox007 · #22 09-10-2010, 12:11 AM

Quote:

Originally Posted by Diesel911

If you calculate the pounds per square inch on the Lid it would not come near the combined Tinsel Strength of the 2 studs.

Tinsel strength, eh? That's nothing short of hilarious!!!

jt20 · #23 09-10-2010, 12:31 AM

Quote:

Originally Posted by tangofox007

Tinsel strength, eh? That's nothing short of hilarious!!!

you could simply offer a correction.

the lid sees 100psi max on a working oil system
that puts about 1260 pounds of force on the lid.

tensile strength of steel ~ 40k psi

the studs can handle almost 2000 pounds each (disregarding fastener limits)

layback40 · #24 09-10-2010, 12:37 AM

Tinsel strength, I will have to get back to you on that. Next Christmas I will do an experiment to calculate it, we dont have any old tinsel here at the moment !!
Maybe the suggestion was to tie the lid on with tinsel?

Sorry Diesel 911, we are just taking it out of you for a minute !!

tangofox007 · #25 09-10-2010, 09:30 AM

Quote:

Originally Posted by jt20

tensile strength of steel ~ 40k psi

Really? How is it that "steel" of unspecified type, dimension or configuration can by attributed to have any particular measure of ultimate tensile strength?

jt20 · #26 09-10-2010, 12:18 PM

Quote:

Originally Posted by tangofox007

Really? How is that "steel" of unspecified type, dimension or configuration can by attributed to have any particular measure of ultimate tensile strength?

so, remind me, who is the one with poor grammar here.

that sentence is nothing short of hilarious!

Sorry I didn't spend my entire evening looking up an accurate number for the steel in use, perhaps I made a mistake.

Find me a figure that comforts you and I will fix it.

Jetmugg · #27 09-10-2010, 12:32 PM

The ultimate tensile strength of those steel studs is much more likely to be above 100,000 psi.

jt20 · #28 09-10-2010, 12:33 PM

Quote:

Originally Posted by tangofox007

Really? How is it that "steel" of unspecified type, dimension or configuration can by attributed to have any particular measure of ultimate tensile strength?

I estimated the dimensions of the cap and each stud

each stud has a about a 1/8" radius

the cap, a 2" radius

the weakness with the stud is that is a fastener, so it will not hold up to the tensile strength of the steel. I am just offering a rough estimate.

jt20 · #29 09-10-2010, 12:36 PM

Quote:

Originally Posted by Jetmugg

The ultimate tensile strength of those steel studs is much more likely to be above 100,000 psi.

what kind of steel do you think it is?

pwagon · #30 09-10-2010, 12:41 PM

Quote:

Originally Posted by Craig

I did than once. I was able to grab onto the broken stud and unscrew it, I used a bolt in place of the stud until I was able to get a replacement from the dealer; I actually replaced them both.

Is the replacement stud only available from the dealer? I think I should be able to ease i out without drilling, thankfully. Won't know until I'm back with the car tomorrow.