The clutch pilot bearing, which is a ball-type bearing that is pressed into the counter of the crankshaft, supports the forward part of the transmission's input shaft and must be checked whenever the clutch parts are detached from the engine. If, for some reason, it is impossible to assess its state, it would be wiser to replace it with a new one. To inspect, first take off the above listed components, then wipe the bearing with a cloth and visually scrutinize it for signs of wear, score lines or damage while using a torch to light up the area. The pilot bearing should rotate freely and quietly; if not, or if the contact surface of the transmission input shaft is worn, use a new bearing which is usually fitted with the 
Clutch Disc for economy. For removal; there is the puller, otherwise a steel bar slightly small than the bearing, wood dowel or socket with fixed bolt can be used. The bar should slide in the bearing to get a light fit and the space at the back of the bar should be packed with grease right from the factory to eliminate air. By use of the bar and banging it forcefully, the grease will give out the bearing from the hole. When the bearing has been withdrawn and the crankshaft recess cleaned install the new bearing by dipping the outside of the bearing in oil and placing it in the crankshaft recess then hammer it gently into position using a hammer and a socket of the outside race of the bearing. Last but not least, replace all the clutch parts, the transmission, and any other part that was removed.