Could you show me a Diagram of belt drive in a Renault scenic 1.6 petrol 2003, and what pulley to adjust when replacing the belt, thanks

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There are fuse boxes all over the place!

Lights wiring and lighting issues
https://www.google.com/search?q=2006+renault+scenic+1.6+lights+wiring+diagram

Fuse box diagram Renault Scenic 2 and relay with ...

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We will show you where the relay and fuse boxes are located in the Renault Scenic 2 generation. We will provide photos of boxes, diagrams and describe the ...
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‎Passenger compartment · ‎Fuse box · ‎Box under the passenger seat

2004-2009 Renault Grand Scenic Fuse Box Diagram

https://knigaproavto.ru > shemy > 378-20042009-renau...
Sept 5, 2017 - Fuse Box Diagram Renault Grand Scenic (2004, 2005, 2006, 2007, 2008, 2009)

Try google images

Hope this helps

Their is a renault owners website http://www.renaultforums.co.uk/
Information deyonde your nightmares

Time to replace the pulley, you can test it by pulling off the belt and spinning the pully with your hand or some compressed air, if it makes noise then its time to replace.

fuse location horn on megane scenic 1.4 2003

If you already removed your belt and you let the cams move you can't re-align them. Although, (BE AWARE IF YOU TRY THIS IT COULD RESULT IN PERMANENT ENGINE DAMAGE) if the amount they are off is minute you could try a socket on both cams and turn them back in to position. The marks should be on cam pulleys that would line up to a similar mark on the block. Hope this could be of some help to you.

The Renault schedule for timing belts on the Scenic is 72,000 miles or 5 years. This applies to both the petrol and DCI models as both have timing belts not chains.

However, please be aware that it is common knowledge in the trade not to let the interval go past 40,000 miles because these engines are renowned for snapping belts at any time after 40k resulting in serious engine damage.

Haynes (who are renowned for their service manuals on many models) recommend a maximum interval of 36,000 miles between belts on this model which is exactly half that of what Renault say!

This information from Haynes is backed up by experience and reports from the trade on the common and unfortunate experiences of customers experiencing belt breakage at 45 k and below.

Hope this helps. Please do leave a vote for the solution. Thanks.

sounds like you have a faulty pulley or tensioner. remove belt and spin pulleys by hand to see if they are ruff and see if their is any play in your tensioner.

Possible dephaser pulley or dephaser solenoid. Pricy