While there are a number of parts in a vehicle which are conceived to last the cars whole life, there are still some, where this does not seem to be the case. There is however, no proof to support this theory, but there is some evidence. Amongst the evidence, is some which comes from the manufacturers themselves. Why otherwise, in the newer models, would the wheel bearings, together with their seating, be thus constructed, so that they can easily be unbolted and replaced?
Shown in the above picture, is a customary wheel bearing which is used e.g., in a front-wheel drive car. The tools used, are a sleeve and a fine-pitch thread. Both must be quite solidly built, because the forces necessary to press out a wheel bearing are relatively high. These tools are also actually intended for the mounting situation. Once the wheel bearing mounting has been dismantled this far, one can place the part under the hydraulic press. This way it's quicker. The same as the old bearing comes out, the new bearing is drawn in. It is important, right from the word go, that it is properly aligned with the future seating. Wheel bearings without continuous drive shafts, are removed with a two- or three-arm puller. Thereby, these arms either claw from the ouside, thus pulling the inside bearing ring(s) from the hub, or from the inside to pull the outer bearing ring(s) from the drum/disc or out of their flange. The mounting of these rings can be carried out with suitable sleeves.
Wheel bearings can be part of the sensor system of an ABS system. In this case the correct mounting direction is to determine. 09/11