Go with an OE rebuilt water pump. About the same price as aftermarket but with 
a better (2 year) warranty.

-D

> On May 13, 2021, at 8:46 PM, Robert Koziak via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Hi All,
>     Today I decided to change the serpentine belt on my 2004 E320 4Matic 
> w/90K.  In addition I wanted to change the belt tensioner assembly and pulley 
> just to head off any future issues.  I was able to change the pulley but 
> could not get the lower torque bolt on the tensioner assembly loose.  I put 
> quite a bit of force but stopped because I was afraid it would snap off and 
> cause some major issues!  Thought of applying heat but it is not easy access 
> to get heat on that bolt location.
>    Anyone have a similar problem or suggestions?  Since it really wasn't 
> necessary I was considering just changing the tensioner assembly pulley.  
> Mercedes Benz doesn't sell just the pulley but Rockauto does.....thoughts?
>    Lastly while changing the belt I found the water pump bearings are very 
> loose so that's my project next week.  Suggestions on the best water pumps?
>    Thanks in advance!
> Bob K
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