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#1
01-20-2006, 01:39 PM
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Serpentine Belt Tensioner Lifespan
I am going to replace the serpentine belt on our 2002 E320 wagon this weekend. I suspect the belt is original from the factory. It carries GATES as mfr and has the MBz part number on it. It's looking tired.
I can see the replacement is very straightforward. I can move the tensioner very easily....it concerns me a bit and I am wondering how long the tensioner might last. This car has just under 60k miles. I pulled out my torque wrench and I can start to move the tensioner with just 22ft*lbs of torque which seems low. I don't have any experience with tensioners on these cars and wondered if there is a test to determine if it should be replaced. Thanks. 
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#2
01-20-2006, 02:21 PM
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If the tensioner doesn't rattle with the A/C on then it is still good!
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
01-20-2006, 02:44 PM
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everthing is quiet, but I had a slight burning rubber smell following a long, fast drive on Xmas Day. I could find nothing else out of order and figured it was a bit of belt slippage.
I'll kick the A/C on and see what happens. i have noticed no unusual noises...just the odor of burning rubber which was faint. Thanks. Last edited by uberwgn; 01-20-2006 at 03:40 PM.
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#4
01-20-2006, 08:58 PM
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Goodyear Gatorback installed. The belt is super-quiet, I hope it lasts.
No change in noise when A/C is switched on so I won't worry about the tensioner at this time. Life is good!  Thx.
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