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

LinkBack Thread Tools Display Modes
Old 06-16-2000, 01:55 AM
Bob U
Posts: n/a
I am in the process of replacing the timing chain in my wifes '87 420sel. The upper chain guides and tensioner rail are grooved quite a bit. I want to replace them but cannot figure out how to remove the old ones.
Help!!! Also once i get the whole thing back together, how do I adjust the tensioner? How will I know if the tension is right?
Thanks in advance for your help.

Reply With Quote
Old 06-16-2000, 08:09 AM
Alain V.'s Avatar
Senior Member
Join Date: Aug 1999
Location: KS.
Posts: 459
BE CAREFUL! This is not an area where you can afford to make a mistake. You question leads me to believe that you do not have alot of experience with chains/tensioners etc. While I understand folks wanting to do some of their own work, you have to realize that if you make a mistake with this project, the consequences can be a bunch of bent valves.

The guides in the heads are held in place by threaded roll pins. There is a special tool for removing these, but you can make your own with a (6x1.25-I think)long bolt,nut and a short sleeve or tube, to fit around the pin as it slowly works it's way out of the head. Of course to access the pins you need to remove the alt & ps brackets.

You do not "adjust" the tensioner on one of these v-8's. My suggestion is if you are replacing a chain with over 100k on it, just buy a new tensioner too and install it.

Do your work ie: changing the chain & upper rails, with the tensioner removed. Use a 27mm socket to turn the engine over BY HAND and doulble check ALL timing marks before starting the car when you are done.

Reply With Quote
Old 06-18-2000, 11:49 AM
Registered User
Join Date: Jan 2000
Location: PA
Posts: 5,440
The pins that hold the guide rails are threaded dowel pins not roll pins. Roll pins are hollow and have a split in one side. It works like a spring because it is compressed when driven into the hole. Dowel pins work on an interference fit usually about 0.0002".
Reply With Quote


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
M103 replace chain but not the guides? d2bernhard Tech Help 14 02-27-2004 01:19 PM
Timing chain + guides replace; Question ??? 190ex26 Tech Help 0 10-24-2003 08:01 AM
560 SEL Rocker Arm Removal hbofinger Tech Help 10 07-23-2003 02:28 PM
Timing chain Guides for M119 engine alternatives? tmnguyen Tech Help 1 01-15-2001 12:58 PM
'87 420SEL Water Pump Help Needed Bob U Tech Help 2 06-15-2000 01:57 AM

All times are GMT -4. The time now is 11:50 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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