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Old 04-09-2014, 07:42 PM
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Join Date: Apr 2012
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Need To know size and length of bolt or allen bolt on tensioner pulley

I have a 1994 Mercedes E320 station wagon. The other day I started the car and all the instrument lights were light up and not going away. Upon further inspection, I looked under the hood and notice the serpentine belt was not moving. In addition, the tensioner pulley was nowhere to be found. I walked around the area and saw the tensioner pulley on the ground. It appears worn out and I ordered a new replacement tensioner pulley. However, I checked the hole in the engine where the tensioner pulley goes in to make sure if it is clear and threads inside are o.k. The Tensioner pulley bolt or allen bolt is missing. I don't know the size, the type of thread, how long the bolt is. Is it a 10mm allen bolt? I researched the internet for this particular Belt Tensioner Pulley bolt or allen bolt and so far, no luck. Any helpful advice and show me where to get this particular bolt or allen bolt is greatly appreciated.

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Old 04-09-2014, 10:10 PM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
Quote:
Originally Posted by dmorgan View Post
I have a 1994 Mercedes E320 station wagon. The other day I started the car and all the instrument lights were light up and not going away. Upon further inspection, I looked under the hood and notice the serpentine belt was not moving. In addition, the tensioner pulley was nowhere to be found. I walked around the area and saw the tensioner pulley on the ground. It appears worn out and I ordered a new replacement tensioner pulley. However, I checked the hole in the engine where the tensioner pulley goes in to make sure if it is clear and threads inside are o.k. The Tensioner pulley bolt or allen bolt is missing. I don't know the size, the type of thread, how long the bolt is. Is it a 10mm allen bolt? I researched the internet for this particular Belt Tensioner Pulley bolt or allen bolt and so far, no luck. Any helpful advice and show me where to get this particular bolt or allen bolt is greatly appreciated.
i had one sheer off.. and freaked out.... i went to the bone yard and got one.... could be allen ...could be standard bolt... i think mine was an allen... but like i said i got one from the bone yard... 3 dollars or something like that
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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


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Old 04-10-2014, 06:10 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,077
dmorgan, call the Parts Department at your local MB dealer. They will be able to get a replacement bolt for you within a day or two, presuming they don't have it in stock. As I recall that bolt has a 10mm allen head.

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