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Old 12-28-2003, 04:49 PM
P. S. Chana
Posts: n/a
Poly v belt


The poly v belt on my w129 sl320 1996 makes a squeeking noise when the steering full lock is applied. Is there a means of adjusting the tension.

It appears that since there are numerious cracks on belt that this needs renewing.
Any advice on the procedure of changing this would be appreciated.

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Old 12-28-2003, 05:07 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Tension is automatic. Replace the belt as it would be slipping, and the noise should stop. If not, replace tensioner.
John Shellenberg
1998 C230 "Black Betty" 240K

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Old 12-28-2003, 11:20 PM
Registered User
Join Date: Apr 2001
Location: Joliet Illinois
Posts: 309
Squeeking belt

If the belt has cracks on the underside it is probably old and drying out. That alone can cause it to squeak and slip. Time for a new belt. When the new belt is installed, it should be tensioned using the proper procedure, provided the tensioner is working correctly.

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Old 12-29-2003, 10:13 AM
The Least of These
Join Date: Jun 2002
Location: Exton, PA
Posts: 559
Replace tensioner?.. or tensioner spring and shock?

I have recently replaced the spring and shock on my 210 and and the belt still is making noise. The belt looks good. Should I just replace the belt, or is there another variable?

I am not trying to hijack the thread...just hoping to offer further insight.
1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction
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Old 12-29-2003, 12:37 PM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,741
When you buy the new belt don't be surprised if it is slightly smaller than the old one. Even a healthy-looking belt needs replacement from stretch. What happens is that the tensioner reaches its maximum travel, and little by little the belt has less tension, resulting in squealing of the accessories.
95 E320 Cabriolet, 131K
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Old 12-30-2003, 11:31 AM
P. S. Chana
Posts: n/a

What is the procedure for tensioning the belt and how do you remove and install the belt,

Many thanks

Last edited by P. S. Chana; 12-30-2003 at 12:45 PM.
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Old 01-01-2004, 12:24 PM
P. S. Chana
Posts: n/a
Replaced the belt today on my SL320 W129.

Posts on this site appeared to suggest that this will take 3 hours on an M103 engine. On my engine M104 it took about 20 mins including figuring out how to remove every thing.

The procedure I followed was:

Remove the radiator fan shroud, which is in two pieces main shroud and plastic ring around edge. Pull out plastic 'O' clip on top of shroud and move plastic ring to direction marked 'open'. Place this panel close to the engine so that the main shroud can be removed first.

Next pull off two metal clips holding main shroud, one top right and other left next to oil cooler. The shroud should clear the fan and pull up and out. The plastic 'O' shaped shroud should be taken out next.

There was no need to remove the fan. Make a note of how the belt is threaded around the various pulleys, or use the diagram in the hand book.

Rotate the tensioning pulley using a 16mm socket on an extension bar on the centre bolt by rotating this clockwise. This should release tension on belt and revmove belt.

Check for any play on all pulleys and any water pump leakage. The tensioning pulley was springing back and forth and did not need replacing.

Place the new belt starting at the crankshaft pulley and follow around until you get to the alternator. Again using the socket turn the nut on tensioning pulley clockwise and put belt on final pulley at the alternator and release load on tensioning pulley by moving it anti-clockwise and the belt should be tensioned.

Replacement of shroud is reversal of removal.

On starting the car the squeeking noise went away and steering was a lot smoother. Photo of car attached.

Attached Thumbnails
Poly v belt-320slblckcomp.jpg  
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