HI there if you are going to take the job on then the new belt will have three marks on it the mark where it is painted on both sides is the mark that goes in line with the mark on the crank sharft , so before you remove the old belt you need to make sure the crank shaft mark is at 6 oclock and the camshaft pulley is between 10 and 2 oclock and the injection pump should be around 2or3 oclock, when you have done this mark the pulleys to the engine so then you will know if one of them moves , when you remove the belt.you will need to replace the tensioner the idle roller and the belt,to replace the belt ,the marks on both sides of the belt go on the crankshaft but make sure the arrows on the belt are going from left to the right ,then in turn put the belt on the pulleys, with matching the marks on the belt to the pulleys, when the belt is on you will need to tension the belt,you will have to find the procedure for this as it is very important,hope this has helped you a little as i told you they are not very nice to do.
mark
November 2008