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Open the bonnet of the Pajero, and turn the bolt on the centre of the tension pulley with a socket wrench two full rotations. The tension pulley is the pulley directly behind the fan in the upper portion of the front of the engine.
Loosen the adjuster bolt on the tension pulley bracket. This bolt is on the left-hand side, situated in a long horizontal groove.
Slip the fan belt off of the engine. Draw a diagram of the path of the fan belt if the factory printed sticker diagram is no longer in the front of your engine on your Pajero.
Insert the new fan belt, winding it through the various pulleys according to your diagram. Put it on the tensioner pulley last.
Place the tension belt tool on the tension pulley bolt and pull until the slack in the belt is gone. When there is no slack, keep the pressure on the pulley, and tighten the adjuster bolt with the wrench. Tighten the lock bolt on the pulley.
The water pump appears to be driven by the camshaft timing belt.
Purists would say the timing belt should be replaced at the same time and every time it is disturbed even if it has been replaced recently.
I would say the water pump should be replaced at the same time as the timing belt whether it needs replacing or not.
You said E30, 320i correct? Your engine is a 2.0L 4 Cylinder engine? If so it does not have a timing belt, it has a chain, upper and lower gears and two chain slides. To change the timing chain and slide set is not easy if you have never done one, neither is the belt on the 6 cylinder engines. I recommend a reputable BMW shop.