Lift the timing belt cover and examine the timing belt to see whether it has been damaged or worn and should note that it can be worn unevenly, split, or oily and also at the end of the roots of the teeth as well. In case of any concern regarding the condition of the belt, then change the belt, the price of a new belt is very small when compared to the cost of the repairs in case the belt breaks. Should there be a leakage of oil, locate and fix the cause of the leakage then clean the area of the timing belt and all the associated parts completely to get rid of any oil spill. Lastly, reconnect the belt cover, and check and readjust the tension of the belt (as required).