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 09-14-2001, 10:31 PM
Posts: n/a
Question Timing Chain

I just had the timing chain on my 1988, 420SEL, V8, 4.2 liter, 116 engine (75K miles). The work was done at a Mercedes dealership. The chain and chain tensioner were replaced but no rails as I had expected. I understood that it was an imperative that the rails be replaced but the service consultant said the rails showed no wear and needn't be replaced. Have I misread the need for rail replacement? Am I facing a rail failure and subsequent chain breakage? Or, am I just a worry wort?
Reply With Quote
Old 09-14-2001, 11:03 PM
Posts: n/a
I just had the timing chain and upper rails replaced on my 420. I believe that the common rule of thought here is that the rails turn amber color from heat and age, become brittle and then break, resulting in major engine repairs.

From what I can glean, the rails are not that more expensive a part and would make sense to replace while the shop is in replacing the chain and tensioner.

The lower guide rails are more difficult and may not be replaced in some instances if not needed.

My rails, at 102000 miles were amber and one was cracked, so it definitely was due.
Reply With Quote
Old 09-15-2001, 06:12 PM
Posts: n/a
Thanks for the advice. I wish I had asked, specifically, that the rails be replaced. I'm extremely disappointed that a MB dealership service center would not do a complete job on such an important component. I would think that MB would have a service bulletin out on rail replacement (as well as all other components of the timing chain package). I would sure like to get a hold of MB's service bulletin on the chain and related components to show to the service consultant. I should have been suspecious because of the cost. The job was done for $750. The same job was quoted at two other MB dealers at around $1,100 to $1,200. I did point out to the consultant that I had read numerous referenced from credible sources that the rails as well as the chain and tensioner shoulc be replaced. He said their experience was that the rails are not a problem if they don't show wear.
Reply With Quote
Old 09-17-2001, 11:18 AM
Posts: n/a
How many hours of labor did the MB dealer charge you for, for the chain and tensioner? I have been getting very different quotes - since you actually got the work done, I would appreciate your response.

Reply With Quote
Old 09-17-2001, 07:58 PM
Posts: n/a
Timing Chain

Here's the break down on costs: Labor $517.50, parts $218.50. Total cost $736. The service constultant said their labor rate is $75/hr. At the rate it took just under 7 hours. ******** in Dallas told me they could do the job in five hours but I didn't get a dollar quote. I should have but a picked the closest dealer. Dallas is two hours from here. Classic Mercedes in Tyler, Tx, is one hour from here. I did get a quote from Parkplace Mercedes in Dallas: $1,100 to $1,200. They said they need the car two days. I don't know whether that included rails but I assume it did because they made a point of saying that the rail replacement was critical. In hind sight, I probably should have had the job done there.

Hope this helps. -- Jerry
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
Just how often should a timing chain be replaced? Greg in Oz Tech Help 16 07-25-2005 05:02 PM
Info on how to replace timing chain tensioner & upper chain guide bodyart27 Diesel Discussion 11 10-15-2003 04:53 PM
OM603 timing chain installation report gsxr Diesel Discussion 3 08-15-2003 11:00 AM
W126 Timing chain help BenzMatic Tech Help 5 08-03-2003 05:14 AM

All times are GMT -4. The time now is 01:48 AM.

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