hi everyone. i have a 1999 c280 (m112) that lately has a grinding noise from the serpentine belt area in cold mornings. but this morning the noise was a lot worse and didn't go away. i took a look at the area and one of the pulleys was vibrating noticeably, and when i turned the car off it had some play when feeling with my hand. what is the pulley in the picture called, the one where the arrow is pointing (has 4 bolts around the center outing)? can i drive the car like that for a couple of days? am i looking at a big bill? my mechanic is out of town until wednesday. any suggestions would be very appreciated.

Attached Images

M112.bmp (57.3 KB, 131 views)

Thats your belt tensioner.

http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=202089&M=112%2E920&GA=722%2E606&GM=717%2E465&CT=M&cat=19X&SID=20&SGR=045&SGN=03

Should be fairly easy to R & R.

Click Buy Parts Tab above to find part cost.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Anyone any idea on how would I go about doing that? would I have to replace the whole assebly or just the pulley?

Pulley
http://www.***************/search/product.aspx?sid=fkxmyp45qcqxswvyzdsvgk2g&makeid=800016@Mercedes&modelid=1356296@C280&year=1999&cid=pulley@pulley&gid=8910@Idler%20Pulley/Roller

Belt Tensioner
http://www.***************/search/product.aspx?sid=fkxmyp45qcqxswvyzdsvgk2g&makeid=800016@Mercedes&modelid=1356296@C280&year=1999&cid=belt%20tensioner@belt%20tensioner&gid=8921@Accessory%20Belt%20Tensioner%20Assembly

replace the whole thing. I wouldn't even consider just a pulley job.

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

I wouldn't even consider doing the whole thing. In fact if they charged any more for the pulley, I would just change the bearings.

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR