It is also important to have the belt tension, which should not be too tight because it would put undue stress on bearings, causing premature wear, or it should not be too loose, which will cause a component to wear rapidly and operate ineffectively such as the alternator and the air conditioner. The checking of belts and their adjustment should be done every 2,000 miles and again after every 4,000 miles, making sure they fit in the pulley and that they are not damaged, have cracks and fraying as well as glazing. The deflection of approximately 4 injury is permissible and the tension can be checked by exerting pressure over midpoint between two pulleys. In order to fit belts, find the mounting bolt on the air pump or alternator, loosen it and then take the adjusting belt. In some models, the adjustments can be carried out through an idler pulley or power steering pump. In adjusting, make sure that any locknuts and bolts are tightened back after attaining the desired tension. Various drive belts can be attached to the RX-7, tension of the belts at specific points must be measured with moderate pressure which is used to measure deflection. To remove, loosen the driven accessory and adjust it so as to clear the belt followed by installing a new belt and letting the engine run a short time to seat the belt then checking tension again.