Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

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

LinkBack Thread Tools Display Modes
Old 07-20-2003, 05:40 AM
Registered User
Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Unhappy timing chain replacement

How does anyone know when to have their timing chains changed besides guessing on the need to have it done based on mileage travelled like 100,000kms, 200,000kms, 250,000kms, 300,000kms ?????

It would be risky to wait until it breaks! Then what? There will be lots of damage costing tons of $$$. So is it true that you have to open the top before examining the chain and guides to decide? Then you will also have to change a new gasket.
Reply With Quote
Old 07-20-2003, 06:37 PM
Registered User
Join Date: Dec 2001
Location: w. North Carolina
Posts: 5
Five years ago, I purchased a 1989 420SEL, my first Mercedes. At that time I purchased a full set of Mercedes manuals and started looking at the Mercedes Owners groups web sites for problem areas. My attention was zeroed into timing chains and what happens when they break; there were horror stories. I decided that I would not chance a break. I ordered the chain, got a friend to help me, and installed it in my V8. Before installation, I carefully measured the length of the new chain. My replacement procedure was to remove both valve covers in order to expose the cam shaft drive gears at the front of the engine. I then used a Dremel tool grinder to remove a pin in the chain linkage, attached the new chain to the end of the old chain, and turned the engine with a wrench to the crank shaft pulley nut, and wound the new chain right in and then bound the ends of the new chain with a link. I also replace all guides available to me from the top of the engine.

Now, was it necessary? The car had 150,000 miles on it when I did the work. After removal of the old chain, I carefully measured its length and compared it to the new chain length. I found no difference in length which meant little or no wear.

Following all this effort, further study concluded that the chain problem in the 420SEL existed only in the early models which had only a single wide chain, while the later models, such as mine, had a double wide chain which gave no problem.

I hope that this may be of value to you.


Last edited by bigcar; 07-20-2003 at 06:43 PM.
Reply With Quote
Old 07-20-2003, 07:33 PM
Wes Bender's Avatar
Retired User
Join Date: Mar 2001
Location: Alpine, AZ / Green Valley, AZ
Posts: 733

I'm not sure what model you are enquiring about and your profile doesn't indicate what model(s) you own, but the answer is nearly the same anyway. I would do a search on the subject and review what has been said in the past.

Basically, the chains don't stretch. They elongate with wear (double chains included). There are methods for checking the amount of elongation based upon where the timing marks are when the camshaft is in a given position. If you hear the very distinctive noise of a broken piece of chain, it needs fixing immediately. The lesser problem of elongation usually makes itself known by a reduction of power (because the cam timing is late).

However, on those vehicles using timing belts, a replacement schedule makes sense.

My $.02.

Reply With Quote
Old 07-20-2003, 10:17 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,741
For the old American muscle car V8s, the method of checking the timing chain was to rotate the crankshaft back and forth while watching the distributor rotor. If there was more than 10 slop, time for a new chain. I'm not sure how or if this method can be applied to MB engines.
95 E320 Cabriolet, 131K
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 08:38 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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