How to fit new fan belt on a 311cdi sprinter van

Sounds like u having a faulty ignition barrel or the key grooves are worn
Locksmith is your best bet

Go to the link
It is a pdf so give it time to load.
http://daycoweb.daycoproducts.com/daycoweb.nsf/cf652a4feb630ad0862571a4005ae40c/1120b6e8f406fd3e862574c000569a91/$FILE/SerpentineBeltRoutingGuide.pdf

Go to the Dayco belt routing diagrams at the link. http://daycoweb.daycoproducts.com/daycoweb.nsf/cf652a4feb630ad0862571a4005ae40c/1120b6e8f406fd3e862574c000569a91/$FILE/SerpentineBeltRoutingGuide.pdf

You need the wiring harness and sensors off the 2 seater.

MAKE SURE GLOW PLUGS ARE GETTING VOLTAGE.COULD BE PREGLOW RELAY.ANOTHER POSSIBILITY WOULD BE FUEL PRESSURE SENSOR AT BACK END OF FUEL RAIL.

If my memorry serves me right, there is no tension to be adjusted, there is a shock absorber that is connected to the tensioner that keeps the tension under pressure. If the shock absorber has lost it's oil, it wont work proply and the belt wheel be lose. Replacing the shock absorber may solve this problem that you are having.

The serpentine belt routing diagram for a 2000 Mercedes-Benz Sprinter 208 CDI, 2.2 liter, 60 kW (82 BHP) OM 611.987 engine code:

1. Without A/C (Air Conditioning) system:



2. With A/C (Air Conditioning) system:



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Alarm sound is normal, sometimes does that, reverse light could be your switch fault or wires touching.

your termastat is gon get a new one