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 12-26-2001, 01:30 PM
Registered User
Join Date: Dec 2001
Posts: 565
M013 serpentine tensioner - weak tensioner bolt threads?

I realize this area has been covered a great deal.

"someguyfrommaryland" responded today in a post titled "W124 Serpentine/Bearing Question". He indicated that the threads on the tensioner were a weak spot.

My vehicle is a 1991 300-SEL. The procedure outlined in the maint manual for loosening the 19mm bolt 1/2 turn has always been followed. I've had the belt off/on 3-4 times in as many years. The last time I was snugging things down, the 13mm threaded bolt seemed to strip - it lost it's hold; then I'd begin to tighten it down again and it would keep tension for just a bit before it slipped again.

Can I merely renew this bolt and the bracket it goes through or do I have to buy the entire tensioner assembly, etc., etc.?

Also, would it hurt next time to maybe loosen the 19mm bolt a little more than the 1/2 turn stated in the manual? Loosening 1/2 turn doesn't seem to give it much slack?

Thanks ahead of time for your thoughts.
Reply With Quote
Old 12-26-2001, 06:59 PM
Registered User
Join Date: Apr 2000
Posts: 412
The tensioner rod is replacable as a seperate item. Buy it at parts shop. You must remove the tensioner assembly to replace the rod. I don't think you hurt anything by loosening the 19mm bolt more than a half turn. You are not the first one to strip the threads on one of these rods and you won't be the last.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
Reply With Quote
Old 01-02-2002, 05:46 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
Remove the 13mm nut and see if the rod indeed has stripped threads. Keep tension on the rod so it doesn't come off the flats on the tensioner. Maybe you have the oddball car with stripped threads on the nut.

91 300SE
81 300SD
Reply With Quote
Old 01-02-2002, 05:53 PM
Registered User
Join Date: Dec 2001
Posts: 565
Sixto-thanks-I will take a look at the nut. Maybe I'll get lucky.
Reply With Quote
Old 01-02-2002, 06:11 PM
Registered User
Join Date: Jun 2001
Location: California
Posts: 324
I just worked on mine this past weekend, and I kept this in mind. Since the nut is a hollow tube, I sprayed in some lubricant (with teflon) to avoid galling the threads and stripping it. It might be too late for yours Mike, but there's always next time...

04 ML500
02 E430

Experience is something you don't get until just after you need it.
Reply With Quote
Old 01-02-2002, 07:00 PM
Registered User
Join Date: Apr 1999
Posts: 2,632
Stripped mine about 2-years ago.

Yes, loosen the 19mm bolt more than 1/2 a turn (I think I did two full turns).

Good luck,
:-) neil
1988 360TE AMG
1993 500E
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
88 300CE serpentine belt tensioner Kyle Blackmore Tech Help 6 11-17-2002 10:29 PM
Lug bolt threads Chris Haney Diesel Discussion 7 09-18-2002 11:25 PM
Help, broken bolt siezed in aluminum Jim Anderson Tech Help 9 01-22-2002 07:30 PM
89 300E Chain tensioner Bolt MikeV Tech Help 1 12-23-2001 05:00 PM
300E belt tensioner problems anthonyb Tech Help 16 10-08-2001 09:15 PM

All times are GMT -4. The time now is 04:43 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