First, you want to know why the belt broke. Do all the pulley (besides crankshaft pulley) spin freely and is there too much play in any of the pulley's bearings?
If they're all good then you can look on any search engine under images to find the belt routing for your car and engine size.
Typing in "2004 Mercedes Benz A160 (______engine size) belt routing" should pull up how the belt is routed.
There is a tensioner pulley that will allow slack for the belt to go on.
Install the new belt according to the belt routing picture and then turn the tensioner pulley to allow the belt to go on all the pulley and slowly release the tensioner once belt is on all pulleys.
This video will give you an idea of how to change the belt out.
https://youtu.be/K13tlf3toiU
Please let us know if you need anything else to get the problem fixed.
Cheers
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Thursday, February 19th, 2015 AT 6:16 PM
