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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-22-2005, 07:52 PM
Registered User
 
Join Date: Sep 2005
Location: Los Angeles, CA
Posts: 47
Belt tensioner strange position on M104 (picture inside)?

On my 300CE24 - 91 (M104 engine) I've got an intermittent noise: like squealing 1/10 of a second every second, that I suspect to be originated from the accessory belt.

First guess was to check Belt tensioner position. I was surprised (see attached picture) to see that the pointer is in position that I called '0' on the picture: I was expecting it in position '1', the higher part of the triangle shape.

What this position should tell about the tensioner: bad setting or damaged one?
Should explain my noise?

Thanks,

Attached Thumbnails
Belt tensioner strange position on M104 (picture inside)?-belt-tensioner-position-300ce24-91.jpg  
__________________
From 300CE to SLK230K
Reply With Quote
  #2  
Old 10-22-2005, 09:05 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,793
Assuming it was set properly when it was installed I would say it's in its death throes. If you set the pointer to read properly and still hear the noise then the tensioner is definitely worn.

Sixto
87 300SDL
Reply With Quote
  #3  
Old 10-22-2005, 09:34 PM
Registered User
 
Join Date: Sep 2005
Location: Los Angeles, CA
Posts: 47
A new belt was installed 1 year ago (previous owner) by a non Mercedes garage (the job done on the water pump didn't give me good impression also...) so I am having some doubt if it was done correctly.

Can this position change in 1 year by itself? I thought it should stay.

Is this position equivalent to trying to overtensioning the belt or trying to do it correctly on a worn tensioner?

If the tensioner is worn and need to be changed: is it recomended to also changed the damper and the tension adjuster also? anything else?
__________________
From 300CE to SLK230K
Reply With Quote
  #4  
Old 10-22-2005, 10:35 PM
haasman's Avatar
Registered User
 
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097
Is the belt properly tensioned. Mercedes and other German cars tend to run with a high belt tension. An old test (not sure it really applies here) is no more than a 1/2" deflection in a long belt span (between two pullies).

If the belt is tight Sixto is probably right: the tensioner has failed. The tensioner is made up of an outer housing of metal and an inner shaft that is attached to the outer by rubber. If the inner twists too far is breaks and you loose the tension.

It also simply be that the tech who changed your water pump didn't understand how to adjust the belt in the first place. BTW, the tensioner is locked in place by a bolt, 17mm I believe, but is tensioned by the long nut in your picture.

If you are not sure, have someone who has "been there and done that" look at it for you.

Haasman
__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
Reply With Quote
  #5  
Old 11-06-2005, 02:11 PM
Registered User
 
Join Date: Sep 2005
Location: Los Angeles, CA
Posts: 47
Tensioning device dead?

What I did:

- first I was surprised, before untightening the tension pulley to see that this one was touching the coolant pump pulley! May be confirming that the tensioning device was not set correctly...

- then I realised that the cursor on the tensioning device was loose: I could move it, so meaning no reference position any more,

- I tightened the tensioning device to a new position which I estimate based on old trick (twisting the belt to check tension); this resulted in shifting the tensioning pulley 1 inch away from the water pump one,

- after that, the tension was kind of OK and my noise disapeared! Cool!

Now, it's been 2 weeks, and I get this noise back and the tensioning pulley touching again the pump one...

Questions:

- seems the tensioning device dead?
I am surprised that when this one is dead, it allows the tensioning pulley to touch the pump one, resulting I thing in stress on the pump bearing!
Does it seem normal, or could I have a too short belt?
I am having a hard time to convert the belt ref into a length to check (need to contact the manufacturer, because it's not a comon brand name).
- when the tensioning device has to be changed, is it recomended to change the damper and the tigthtening rod also? Something else?
I'd like to order parts before dimounting...

Thanks,
__________________
From 300CE to SLK230K
Reply With Quote
  #6  
Old 11-06-2005, 09:11 PM
haasman's Avatar
Registered User
 
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097
Sounds like the tensioner unit has failed and is twisting inside the housing.

Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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 05:16 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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