[MBZ] Serpentine Belt Tensioner Components

[l02turner@comcast.net]

you wrote<<Check the operation of all the drive components, idler, tensioner 
and so on. If any of these have excessive play or are noisy, replace it>>>

Good suggestion - my lower pivot was twisting so I bought all the 
replacement parts - when I removed all the parts, I found the damper, 
spring, tensioner and lower pivot were all bad - and with only 100k on my 
engine/car I think Marshall's comment when he said <<<In my experience, the 
belt/tensioner/shock/idler assembly require attention about every 75kmi, but 
not every piece needs to be replaced every time. The shock absorber seems to 
be the shortest lived element. >>> is accurate.

Sincerely,
Larry T ('74 911, '67 MGB, 91 300D Turbo)
A Blood Test for your oil - www.youroil.net
For Test Results http://members.rennlist.com/oil
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http://members.rennlist.com/my_911/Index.htm For my Paint Job Info
----- Original Message ----- 
From: <mykd1 at netscape.net>
To: <Mercedes at striplin.net>
Sent: Thursday, June 01, 2006 5:04 PM
Subject: Re: [MBZ] Serpentine Belt Tensioner Components


> Here's a quick rule of thumb when replacing the serpentine belt. Check the 
> operation of all the drive components, idler, tensioner and so on. If any 
> of these have excessive play or are noisy, replace it. They don't always 
> last the life of the car so its a good bet to replace them if you car has 
> high mileage.
> my 2 cents
>
> 69 280 SEL 120,000 Miles
> 72 350SL   108,000 Miles
> 2004 VW Passat 4 Motion
> 1999 Mazda Miata
>
>
> -----Original Message-----
> From: Marshall Booth <mbooth+ at pitt.edu>
> To: Mercedes Discussion List <Mercedes at striplin.net>
> Sent: Thu, 01 Jun 2006 14:04:12 -0400
> Subject: Re: [MBZ] Serpentine Belt Tensioner Components
>
>
> M.Afzaal Khan wrote:
>> Hi!   At what mileage did you have to change this.? just like to know 
>> what
>> is the life of a belt tensioner and other  idler pulley's associated with 
>> it
>
> The original tensioner arms and idlers used on '84-'85 OM60x engines
> seldom lasted more than 50-75kmi. The later ones seemed good for
> 75-150kmi. By the '90s they may still be better (the aftermarket ones
> MAY not be - I haven't had any of them in long enough to know). Factory
> shocks seem to last 75+kmi while aftermarket ones seem more likely to
> fail by 50kmi. The belts on my cars seem to go for 75kmi as long as the
> arm and idler are in good working order (a bad arm, idler, shock or any
> belt driven accessory will cause a belt to fail prematurely).
>
> YMMV as climatic and environmental factors DO play a role in life of
> these parts.
>
> Marshall
> -- 
>      Marshall Booth (who doesn't respond to unsigned questions)
>       "der Dieseling Doktor" mbooth at pitt.edu
> '87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84
> 190D 2.2 229Kmi (retired)
>
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