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 > Vintage Mercedes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-05-2017, 09:42 AM
Registered User
 
Join Date: Jan 2006
Location: Tucson, AZ
Posts: 3,739
M115 timing chain tensioner

115 050 11 11

Are the M115 timing chain tensioners rebuild-able? I imagine they are but I don't want to tear this one apart and find out they aren't.

The engine has a slight "slapping" noise when first accelerating from a "hot" idle (oil pressure at its lowest point, apx. 25PSI) which ceases when the RPM's increase and the pressure rises.

The tensioner also fully collapses when the engine is shut off. I know this is not correct for any every other Mercedes I have seen but don't know if it is normal for the M115.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
Reply With Quote
  #2  
Old 04-05-2017, 11:08 AM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 1,824
Looking up an image of your tensioner, it looks like it should come apart for cleaning. I redid the tensioner in my OM603 for the same reasons as you. Varnish was the enemy, everything was clogged up with it. Since cleaning, it's been fine.

WARNING: Make extra special attention to the FSM on the installation procedure for your specific engine! Some tensioners have a specific installation method and can ruin the chain or camshaft if installed incorrectly!
__________________
'86 300SDL - "The Diseasel" 177K
'83 500SL Euro - "The Money Pit" 116K
'11 Honda Accord EX - "The Daily" 60K and counting...
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Reply With Quote
  #3  
Old 04-05-2017, 03:59 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,145
Mike,
The tensioners of the M115, M130, and OM615/616 appear (from parts diagrams) to all be the same internally. The M115 and OM615/616 tensioner bodies also appear to be the same, while the M130 has a different body. The M110, however, is different internally; there is a ratchet mechanism which is not found in the earlier style.
So, to answer your question, it would seem that your tensioner is readily re-buildable, with a particular eye to spring condition. That it goes slack without oil pressure suggests that the spring is in trouble.
Reply With Quote
  #4  
Old 04-05-2017, 06:58 PM
Registered User
 
Join Date: Jan 2006
Location: Tucson, AZ
Posts: 3,739
Thank you gentlemen.

I was a bit leery of tearing into the part, especially since the replacement costs I found were in the $280.00-ish range. I've since located a supplier which lists the part at $70.00 so I feel a little more comfortable.

I don't mind trying a $70 experiment.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now
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




All times are GMT -4. The time now is 03:53 AM.


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