The clutch pilot bearing an oil-impregnated type fitted between the rear of the crankshaft and pressed against the front of the transmission input shaft should be checked whenever the clutch parts are detached from the engine. In the case of doubt because of the impossibility of examining its state, it is better to install a new unit. Start with the elimination of the major part such as the transmission as well as the clutch assembly. Wipe it with a rag and using a torch take a closer look at the bearing for such signs as wear, scoring or damage. In some models, it can be removed using only a special puller and slide hammer attachment; after removing the bearing, it is necessary to clean the crankshaft recess. For installation, lubricate the outside surface of the new bearing with oil and fixing it into the recess by using a driver and hammer. Last but not the least replace all the components that were removed to gain access to the pilot bearing part such as the clutch part, the transmission as well as other correspondents.