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Old 06-02-2002, 03:35 AM
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Belt tensioner damper

I have removed my damper today and I was woundering if its time to relpace it?
It is the original damper. I am also woundering what is the purpose of the damper?
I have a 1988 300E M103 Auto with A/C
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Old 06-02-2002, 04:57 AM
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Join Date: Apr 2002
Posts: 3,469
Put it in the vice, and try to spin the arm about the part where it bolts to the block. If it movies in a circle, it needs to be replaced. If it stays still, then its probably fine.
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Old 06-02-2002, 08:10 AM
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Since they are a bit of a pain to get out and cost so little, it's best to just replace it if it is 15 years old. The end bushings in mine were worn out causing an expensive sounding engine rattle at idle. After replacing it I couldn't believe how quiet the engine could idle!
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Old 06-02-2002, 12:53 PM
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Join Date: Jul 2001
Posts: 74
You have the part out, change it now.
1987 190 Euro
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Old 06-03-2002, 10:49 AM
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I agree

You're lucky if you've never had to replace it yet. Mine needed replacing after 4 years. Chances are that it will go at some point, so if it's out now you should replace it.
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Old 06-03-2002, 11:26 AM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Your other question went unanswered...the damper keeps the belt in tension, yet allows for some movement due to engine vibration without allowing so much slack that the belt comes loose.

Never seen such a system on other makes, and it does appear to be an odd design, but it works.
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
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