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Old 03-18-2003, 06:49 PM
tivoliman's Avatar
Happy with Mercedes
Join Date: Dec 2002
Location: New Jersey
Posts: 360
Grinding noise from Engine compartment

Car: 1993 500SEL

A grinding noise is coming from the front of the engine - "by the belt".

As best as I can determine - it's coming from a device on the belt, on top of the alternator. The black plastic on the left of it vibrates simular to the grinding noise.

Is this an air pump?

Thanks for your continued help.

Comment: I just had the water pump replaced - what is it now?
Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
'95 E420 (188K)
'03 LS430 (Lexus)
- - - - -
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard, sigh
'93 500SEL (214K) - Moved to another family, still runs like a young pup
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Old 03-18-2003, 07:14 PM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Well, if the noise is coming from the front of the engine and you determined it is coming from a "device on the belt", next step is to determine which device. With the engine running, using a mechanics stethascope, long screw driver or wooden dowel rod, you can listen to each of the accesories individually. Use extra care as it is easy to accidently get wrapped up in the drive belt(s). When you reach the offending accessory you will hear a definite difference in the internal sound - most likely a bearing heading south.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
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Old 03-18-2003, 07:24 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
See if the dipstick support is rubbing against the water pump pulley.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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