The serpentine belt on the Volvo S-60 controls all of the accessories on the front of the engine. These accessories include the alternator, power-steering pump, air-conditioner pump and the water pump. The serpentine belt is driven by the crankshaft on the bottom of the engine. Each time the crankshaft rotates, the serpentine belt travels around each accessory pulley. When the serpentine belt starts to crack within the ribs on the inside of the belt, the belt will need to be replaced.
Open the bonnet on the Volvo S-60 and find the serpentine-belt routing diagram. The diagram should be attached to the top of the fan shroud that covers the radiator. If not, draw out the exact routing method of the serpentine belt around each pulley with a pen and a piece of paper.
Locate the serpentine-belt tensioner that is in the very centre of the engine. The tensioner will have a square bolt head in the centre of the tensioner pulley.
Slide the open end of the 5/8-wrench onto the square bolt head in the centre of the belt-tensioner pulley. Turn the tensioner pulley counterclockwise and slide the serpentine belt off of the tensioner pulley.
Remove the serpentine belt from the other pulleys and pull the belt out of the engine compartment.
Slide the new serpentine belt into the engine compartment and around the crankshaft pulley.
Route the new serpentine belt around each pulley. Turn the belt-tensioner pulley counterclockwise again and slide the serpentine belt around the tensioner pulley. Release the tensioner and it will tighten the belt around the pulleys. Look over the belt to ensure that it is inside of each pulley.
Crank the S-60 and look over the serpentine belt with the motor running. Let the engine run for about one minute and shut the engine off. Close the bonnet.
When the serpentine belt has more cracks per square inch than it does ribs across the belt, then it is time to replace the belt.
Always wear safety glasses when working inside of the engine compartment.