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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-10-2008, 05:24 PM
pepprdog's Avatar
Registered User
 
Join Date: Sep 2007
Location: Southern Ohio
Posts: 7
Need tech specs 1991 190-2.6 head bolts

Where can I find specs for MBs on line?
I have about every MB factory book made from 1965 to 1986 but since I retired I have gotten just a few , mostly CDs and Haynes. I don't work on many cars anymore but it seems that every one I get is one I have no information on. Living in a very rural area makes getting anything difficult unless I can get it through the internet/satellite.
Right now all I need is the max length of the head bolts but a quick resource for this kind of info would be greatly appreciated..........

__________________
You are reading this...........Thank a teacher.
You are reading this in English....Thank a soldier.
Reply With Quote
  #2  
Old 12-10-2008, 11:48 PM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 818
Quote:
Originally Posted by pepprdog View Post
Where can I find specs for MBs on line?
I have about every MB factory book made from 1965 to 1986 but since I retired I have gotten just a few , mostly CDs and Haynes. I don't work on many cars anymore but it seems that every one I get is one I have no information on. Living in a very rural area makes getting anything difficult unless I can get it through the internet/satellite.
Right now all I need is the max length of the head bolts but a quick resource for this kind of info would be greatly appreciated..........
According to the information I used when I replaced the head gasket on my 2.3, if the length of the head bolts on a 2.6 exceeds 108.4mm, the bolts must be replaced with new stretch bolts.
__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
Reply With Quote
  #3  
Old 12-11-2008, 01:41 AM
wbain5280's Avatar
Registered User
 
Join Date: May 2001
Location: Northern Va.
Posts: 3,386
They're cheap, buy new ones. I did for my 300SE's valve job.
__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.
Reply With Quote
  #4  
Old 12-11-2008, 07:52 PM
Registered User
 
Join Date: Jan 2003
Location: Dallas
Posts: 786
Yeah, I think I paid about $40 AT THE DEALER for new bolts.
None of my old ones were stretched past 108.4, but when you are torquing to 70 NM, then turning an additional 180 degrees, you want that warm feeling that one of those suckers isn't going to break!
Torquing those head bolts that far was one of the scariest jobs I ever did to a car.

DG
Reply With Quote
  #5  
Old 12-12-2008, 01:12 PM
pepprdog's Avatar
Registered User
 
Join Date: Sep 2007
Location: Southern Ohio
Posts: 7
Thanks guys, I have new bolts but when I read the max of 108.4mm and these measured 114.17, I can see why the exhaust side bolts could have been removed with a 1/4 inch wrench set .......they were REALLY loose.
So it's 70Nm and 180 for the 2.6 - 103........
__________________
You are reading this...........Thank a teacher.
You are reading this in English....Thank a soldier.
Reply With Quote
  #6  
Old 12-13-2008, 09:33 PM
Registered User
 
Join Date: Jan 2003
Location: Dallas
Posts: 786
The length measurement is taken from the end of the bolt up to the seating surface below the head. I think you may have been measuring the overall length including the head & flange of the bolt. It's unlikely that your original bolts are out of spec (longer than 108, if measured as above), but as we said, it's a good idea to use new ones.

Yes, the torque process should be:
- Be sure bolts are clean and oiled. Oil the contact surface under the bolt head and on the cylinder head surface. Clean the bolt holes of course.
- start with the middle bolts (lower, then upper) and work forward and back equally to the front and rear bolts
- 1st pass approx 35 NM (just to be safe).
- 2nd pass 70 NM
- 3rd pass - 1/4 turn (90 degrees) Use an 18 inch breakover bar.
- 4th pass - another 1/4 turn. (grunt).

That last pass will scare you, they get hard to turn.
If anything acts strange, like not torqueing evenly, you may be galling the surface of the head. Stop, remove the bolt and check.
Some like to use an angle guage, to accurately get the 1/4 turn, but if you very carefully align your wrench handle you can approximate 1/4 turn very closely.

cheers,
DG

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 03:55 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page