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 02-20-2001, 03:59 PM
Linda
Guest
 
Posts: n/a
I have a 1993 1902.3E which has had a complete motor rebuild. When I first got the car, it had a broken cam. After the motor was rebuilt, it broke the replacement cam. Now, after driving it for about 100 miles, the cam has just broken again. Each time is in the same place - just (above I think) the oil gallery. Both my mechanic and my rebuilder believe it is a bad part. It is a "genuine Mercedes" part. I'm concerned that there is something that is not right causing this to break since it always occurs in the same place. This time the valves were not bent so thank God for small favors. Does anyone have any experience which might help? Thanks to any and all who might reply.
Reply With Quote
  #2  
Old 02-20-2001, 04:19 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The only times I have seen this occur it was because the chain tentioner was installed improperly. It is VERY easy to do improperly.

The tentioner is a ratcheting type and it must be disassembled for installation. If the whole thing is installed it natuarally extends during the installation process to full length. When pulled tight the chain becomes severely overtightened.

The proper method is to pull the tentioner, push the piston out (it will only go longer until it comes out), place the body in the head and shove the piston in from the back side. The spring goes in and shoves the piston til it hits the chain. When the spring is tentioned by the end cap it applies only the spring force against the chain. After the motor runs the oil pressure holds the chain even tighter.

The value to the ratchet is when the oil pressure is gone the piston can only be shoved back to the closest ratchet position (not far) keeping the chain from rattling while oil pressure is building.

I can think of around 300 V8 owners who wished they had such tentioners (bg).
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #3  
Old 02-20-2001, 10:18 PM
Linda
Guest
 
Posts: n/a
Thanks for the advice very much. I'll pass this along and hope it helps!
Reply With Quote
  #4  
Old 02-20-2001, 10:21 PM
Registered User
 
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Go with Steve on this. I have seen it too!
__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
Reply With Quote
  #5  
Old 02-20-2001, 11:28 PM
Linda
Guest
 
Posts: n/a
Thanks again so much. I really appreciate this site and the help everyone provides. I'll have a follow-up soon I hope.
Reply With Quote
  #6  
Old 02-21-2001, 06:23 PM
clacker
Guest
 
Posts: n/a
Perhaps the cylinder head is out of round? A bent head would do this too...
Greg
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chain tensioner...which way will it draw cam? greenacres2 Tech Help 11 11-11-2003 10:32 AM
Replaced cam seal w/o removing timing cover!:D mplafleur Tech Help 0 12-24-2001 11:29 PM
Replaced cam seal w/o removing timing cover!:D mplafleur Tech Help 1 12-24-2001 04:34 PM
Tranny 3rd to 4th shift problem can-do Tech Help 0 02-18-2001 02:19 AM
Installing Cam and Rockers in M103 head LarryBible Tech Help 3 10-25-2000 12:32 PM



All times are GMT -4. The time now is 03:06 PM.


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