Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-22-2011, 07:03 PM
silversleeves's Avatar
Registered Snoozer
 
Join Date: Jun 2007
Location: Vancouver, BC
Posts: 139
Bolt grade question

Lower ball joint replaced on my 91 300te 4matic and sound is gone but...
I stripped the bolt running through the pinch clamp accidentally (of course), and have temporarily fitted a grade 5 nut and bolt in its place until I can get the proper nut and bolt from the dealer. How much danger would I be putting myself in by driving with this incorrect bolt and nut?
Reply With Quote
  #2  
Old 01-22-2011, 11:15 PM
Fold on dotted line
 
Join Date: Aug 2007
Location: SE Mich
Posts: 2,788
Quote:
Originally Posted by silversleeves View Post
Lower ball joint replaced on my 91 300te 4matic and sound is gone but...
I stripped the bolt running through the pinch clamp accidentally (of course), and have temporarily fitted a grade 5 nut and bolt in its place until I can get the proper nut and bolt from the dealer. How much danger would I be putting myself in by driving with this incorrect bolt and nut?
Lots, if you drive for any extended period. You need a higher grade bolt, get a grade 8 bolt or even metric higher grade based on the requirement. Think about what would happen if this came loose.

Some things matter less, this is not one of them.
__________________
Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6
Reply With Quote
  #3  
Old 01-22-2011, 11:34 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,340
Answer

Quote:
Originally Posted by silversleeves View Post
Lower ball joint replaced on my 91 300te 4matic and sound is gone but...
I stripped the bolt running through the pinch clamp accidentally (of course), and have temporarily fitted a grade 5 nut and bolt in its place until I can get the proper nut and bolt from the dealer. How much danger would I be putting myself in by driving with this incorrect bolt and nut?
That bolt takes extreme stress = why they could not use a cheaper one.

Look at the strength difference in these charts.

http://www.americanfastener.com/technical/grade_markings_steel.asp

http://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx

http://www.boltscience.com/pages/faq.htm

http://euler9.tripod.com/bolt-database/22.html




.
__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Prototype Vehicle build.
Prototype Fleet Durability
Prototype vehicle instrumentation.
Technical Quality Auditor.
Automotive Technical Writer

1973 300D
1973 309D - stolen
1978 280SE
1980 240D
1983 300D
1984 190D
Reply With Quote
  #4  
Old 01-23-2011, 12:03 AM
Crazy_Nate's Avatar
Registered User
 
Join Date: Jan 2008
Location: Hampton Roads
Posts: 567
So, what happens when you use a different grade bolt...?

Not as strong...given
Depending on the torque, it may yield with the applied preload + service loads
Different loosening behavior (especially if you can't apply the same preload)
Different material = different susceptibilities to corrosion, stress cracking, etc.

If it works...keep it the same. If you feel like modifying it - you better know what went into the design and be capable of making the proper assessment
__________________
1982 240D, sold 9/17/2008
1987 300D Turbo
W124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting
Reply With Quote
  #5  
Old 01-23-2011, 12:35 AM
silversleeves's Avatar
Registered Snoozer
 
Join Date: Jun 2007
Location: Vancouver, BC
Posts: 139
Thanks for the input, I plan on changing it Monday with one from the dealer. I am cautiously driving around town for essentials only until it is replaced, actually, I think I will just ride my bike to the grocery store.
Reply With Quote
  #6  
Old 01-24-2011, 07:53 PM
silversleeves's Avatar
Registered Snoozer
 
Join Date: Jun 2007
Location: Vancouver, BC
Posts: 139
Just installed the correct nut and bolt from the local MB dealership, I feel a lot more confident now with the $8.00 set in there versus the grade 5 freebie from lordco!!!
Thanks for the input.
Reply With Quote
  #7  
Old 01-24-2011, 11:26 PM
whunter's Avatar
Moderator
 
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,340
Excellent

Hope you get many years of pleasure driving it.
Reply With Quote
  #8  
Old 01-26-2011, 06:01 PM
Registered User
 
Join Date: Aug 2008
Posts: 436
what's a pinch clamp?

What was the marking on the old bolt ?

8.8 metric approximately grade 5
10.9 approx grd 8
steel socket headed cap screws are generally grd 8 unless they are stainless.
Reply With Quote
  #9  
Old 01-27-2011, 11:38 AM
silversleeves's Avatar
Registered Snoozer
 
Join Date: Jun 2007
Location: Vancouver, BC
Posts: 139
http://i284.photobucket.com/albums/ll4/pwogaman/1990%20Mercedes%20300TE/100_1166.jpg

That is the pinch clamp i referred to.
The new bolt MB part number = 129 990 10 01
The old bolt has been binned.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page