S500 Poly (Serpentine) Belt Change - Mercedes-Benz Forum
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#1 (permalink) Old 07-06-2008, 10:03 AM
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S500 Poly (Serpentine) Belt Change

Just changed the poly (aka serpentine) belt on my '98 S500. Very easy once I had done it once. I have the third type of tensioner. The manual directions included loosening the fan ring which was a useless step and took much time and fiddling around to get the mating posts re-engaged. Next time I would just leave the fan ring in place. It also requires an E-10 torx socket to release the pressure on the tensioner. The torx socket is only used to rotate the tensioner towards the center of the engine and then the belt is easily slipped off. The socket is not used to unscrew the torx bolt but just used to move the tensioner to release the tension.

This should be a real money maker for shops as the book rate is listed as 0.6 hours where it could easily be done in 15 minutes once you have done it before.

Alldatadiy.com has all of the instructions.

FYI - In the Star Classic manual - this is called the AC compressor belt.
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Last edited by dmac_S500; 07-06-2008 at 10:04 AM. Reason: Added extra tidbit of info
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#2 (permalink) Old 07-06-2008, 11:44 AM
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yup, very easy.
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#3 (permalink) Old 07-06-2008, 01:48 PM
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Thanks for the info dmac_S500,
One question, About how much play should there be with the belt? How do you gauge that? I will be doing the same thing this week and want to make sure it's not to tight.

Thanks,
Lesko
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#4 (permalink) Old 07-06-2008, 01:59 PM
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With the tensioner, I didn't really worry about or check the belt play. It seemed appropriately tight and there is no adjustment to deal with as the M119 belt tensioner is spring loaded. I'm not sure if the M104 system is different. I'm sure there are others on the forum that could give you some more relevant detail.
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#5 (permalink) Old 07-07-2008, 06:13 AM
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While you're there dmac, can you do me a favour? You have a 98 with a 119 so your car should be very similar to mine. Your engine bay should look thus;

With your MAF positioned somewhere inside the Vee, (between labels 3 and 2). Tell me, if you switch the ignition on, (turn off blower motor, stereo and such), can you hear the MAF buzzing?
Kind of like a louder version of the interior blower aspirator in the headlining but at about 3 times the volume.
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#6 (permalink) Old 07-07-2008, 07:53 AM
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it's probably ETA thats buzzing,i had doubts about that after rewiring ETA ,when ignition is on you can hea zzzzzzzzzzzzzzzzzzzzzzzzzz,little motor is turning ,stays all the time right?

Don't assume ..... ,But know...
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#7 (permalink) Old 07-07-2008, 08:25 AM
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Quote:
Originally Posted by symbolic95 View Post
it's probably ETA thats buzzing,i had doubts about that after rewiring ETA ,when ignition is on you can hea zzzzzzzzzzzzzzzzzzzzzzzzzz,little motor is turning ,stays all the time right?
That description is absolutely spot on, may as well take it to bits as I need a new one anyway. Maybe I can repair it. It's unbelievably difficult to get out.

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#8 (permalink) Old 07-07-2008, 09:30 AM
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HOW DO YOU KNOW YOUR eta NEEDS TO BE REBUILD,do you experience rough idle?

I asked other member with s320 he said his does the same zzzzzzzz

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#9 (permalink) Old 07-07-2008, 09:54 AM
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AFAIK, this is normal sound for the ETA, with ignition on and un-started motor.
The ETA tries to reset the butterfly valve, and explore its extreme positions.

Mine does it too, but it is most hear-able when filter case is off.

br,
syljua

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W123 230E 1984
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#10 (permalink) Old 07-07-2008, 10:06 AM
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Mine does it for as long as the ignition is on. I have cutting out issues at the moment. Now that I've had a look, can see the wiring is all brittle. Got the MAF off and gave it a good clean. I'll put the whole lot back together later and see what gives.
Never noticed that it was always on before.
By the way does anybody know where the oil temp sensor is located?

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Last edited by gumsie; 07-07-2008 at 10:08 AM.
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