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 07-03-2003, 02:54 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
techs, do you lube M103 head bolts?

If so, what do you use? Motor oil? Assembly lube?

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD

Reply With Quote
  #2  
Old 07-03-2003, 05:36 PM
DR.DIESEL's Avatar
Senior Member
 
Join Date: Mar 2003
Location: Puget Sound, Washington St.
Posts: 522
I use a light coating of ATF. Some others use WD40 ect...
DR.D
Reply With Quote
  #3  
Old 07-03-2003, 09:00 PM
LarryBible
Guest
 
Posts: n/a
WD40 is too light. Any oil will do, I personally would not use ATF, it is too light, but will probably be okay.

Good luck,
Reply With Quote
  #4  
Old 07-04-2003, 02:17 AM
Registered User
 
Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576
Head bolt lubrication...

Hi there,
I have always used chassis grease to lube both the threads and the shoulders of the head bolts. This allows for very consistent head torque measurment. In over 35 years and over a dozen engines or more I've never had a problem. It's especially important to use some kind of grease or anti-seize when the bolt is going into threaded aluminum. If you don't it might not come back apart again.
By the way, here's a tip for removing bolts that have broken off in a head or block - use a mig welder to build up the broken piece to a height that you can weld another bolt on the built up piece. Then very carefully back out the bolt. The welding causes enough heat so the bolt or stud usually comes right out with little effort.
Another tip is to ALWAYS chase the threads in a block using a tap, before installing the head. This will help ensure a consistant torque, and if the hole has oil or antifreeze in it, it will help get rid of it.
Here's another tip, and an important one. If you use a silicone sealant, like RTV, etc., be sure not to use too much. I've seen some very shoddy jobs where engine passageways were actually plugged by silicone sealant. The way I prefer to do it is messy but works well. Apply a small amount on each side of the gasket surface, then work it in with your fingers, removing any excess material. It really doesn't take much at all to do a great job of sealing. Make SURE that the surfaces to be sealed are absolutely clean and DRY. The RTV will not seal if there's any oil or water on the surface to be sealed. Also, don't use it where it is exposed to gasoline - it will dissolve in short order. It is good for sealing oil and water, not gasoline.
Regards,
Richard Wooldridge
'82 300D/4.3L V6
Etc...
Reply With Quote
  #5  
Old 07-04-2003, 05:10 AM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
I run the bolts through a die, tap out the holes in the block, clean the bolts in solvent and blow dry, then use motor oil on the threads, and after oiling, let them sit on paper towels to remove excess oil. make sure you get oil on the bottom of the bolt head (the contact surface to the block), and MOST important is to use air to blow any oil, antifreeze, or what have you, out of the holes in the block. Make sure you measure the bolt length after removing them to make sure they aren't stretched beyond what's allowed.

Gilly
Reply With Quote
  #6  
Old 07-04-2003, 05:16 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Gilly,

Since you joined, let me ask this - why does the W124/M103 shop manual (01-1450 ref 01-1050) say torque to 55Nm, 90-deg, 90-deg and the W126/M103 shop manual (01-450) say torque to 70Nm, 90-deg, 90-deg? Are they not essentially the same engine? I don't have access to a W201 shop manual so I don't know what it says.

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD
Reply With Quote
  #7  
Old 07-04-2003, 05:50 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
I couldn't get M103 work instructions to come up on my 124 disc, some disc problem. I did check to see what the torque spec would be on an M119 motor, and came up with the 55nm, 90-90 torque spec, so maybe you were looking at the wrong engine.
I verified that it's 70nm, 90-90 on the 126 chassis and also in the 201 chassis, I'd use 70nm, 90-90 on it.
Reply With Quote
  #8  
Old 07-04-2003, 10:32 PM
Kyle Blackmore's Avatar
Mostly Harmless
 
Join Date: Sep 2001
Location: almost beyond Hope...B.C.
Posts: 979
Oh great ,I just did my head last weekend and MY 124 disc said 55Nm,90,90. That's what I did , hope everything will be OK.
__________________
Democracy dies in darkness, you have to kick at the darkness till it bleeds daylight
Reply With Quote
  #9  
Old 07-05-2003, 08:17 AM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Kyle
It should be OK. I'm curious where/how you found this spec.
Here is what I'm trying to do to find it and the problem I have:

I tried finding it using your car as an example, so i selected a '88 300CE, then selected the "confirm" button on the following screen. Selected "engine manual", then selected "mechanical and combustion manual" (the other 2 choices were LH injection and cruise control). The screen I get next only offers these choices:
07.3 KE injection
09 air cleaner
14 intake and exhaust manifolds and emission control
15 electrical
30 accelerator control
47 fuel system
49 exhaust system

technical modification
modification notes
programmed repairs

I tried doing this with several different 103 engine-equipped vehicles with the same results. No selection for group 01 like there should be.

Gilly
Reply With Quote
  #10  
Old 07-05-2003, 01:46 PM
Kyle Blackmore's Avatar
Mostly Harmless
 
Join Date: Sep 2001
Location: almost beyond Hope...B.C.
Posts: 979
Hi Gilly, you should get a choice between the mechanical and combustion manuals.The sections you mentioned are in the combustion manual.If you have a problem with the program/disc try opening it from Adobe.Sections 01, 03, 05, 13, 18, 20, and 22 are in the mechanical manual.These discs have their weird little ways sometimes, I couldn't open section 7.3 until I downloaded Adobe 5 . I won't worry about the torque on the headbolts though, thanks.
__________________
Democracy dies in darkness, you have to kick at the darkness till it bleeds daylight
Reply With Quote
  #11  
Old 07-05-2003, 03:05 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Someone told me it's in section 01-1450 so I went straight to the PDF in the Engine\103 folder. No toruque specs in 01-1450 which sends you to 01-1050. Could be that the index sends you somewhere else but I had the same trouble as Gilly coming at it with a W126 CD mindset.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
Reply With Quote
  #12  
Old 07-05-2003, 10:48 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
I guess I'd be worried that the specs Kyle is getting is actually for a V8, like a 400E, as the spec he has matches what I come up with if I research the bolt torque as a V8 model.

Gilly

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 10:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page