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You’ll find them in the engine, transmission, transfer case, and axles. Bearings allow shafts to spin in housings and transmit power throughout the entire drivetrain, reducing friction while riding in grease or oil.
There are three common types of moving bearings used in automotive drivetrains: needle, ball, and taper roller bearings. Each has an intended use and the sizes used are dependent on torque load, supported weight, and rotational speed. They typically consist of an inner race, outer race, and a set of rollers or balls in a cage that ride between the two races.
Bearings can support shafts in two directions, radially (perpendicular to the shaft) and axially (parallel to the shaft). Needle bearings support loads almost entirely in a radial direction due to the cylindrical shape of the rollers. Ball bearings support most loads in a radial direction and can support light loading in an axial direction. Tapered roller bearings with their angled rollers are designed to support heavy loads in both directions.
The three types of bearings are designed to support different types of loading. Needle bearings are commonly found in tight spaces on shafts in transmissions or transfer cases, or in U-joints, where little or no axial loading is present on the bearing. Ball bearings are often found in transmissions, transfer cases, and at the outer axle shafts on rear semi-floating axles. Taper roller bearings are most commonly found in use for wheel bearings or in differentials.
Grease (or an oil bath) is the lifeblood of a bearing. When lubrication is lost or compromised, surface friction causes rapid heating. Heating degrades the treated metal surfaces of the bearing and rapid wear and failure ultimately follows. Contaminants like water or dirt can hamper the lubricant’s ability to work. Keep bearings clean and dry. Many bearings can be lubed quickly with a bearing packer, such as this. Or use the original method of hand packing by working grease thoroughly into the bearings with your fingers.
The separate outer races or inner portion of taper roller bearings or ball bearings often have a press fit to the housing they ride in. Bearings or races to be discarded can be driven out using a steel rod or other drift. Ideally, though, install new bearings using a softer brass drift to prevent marring or distorting the race or bearing during installation.
In a case where a specialty bearing puller is unavailable or the bearing is pressed over a part that allows no room for a puller, go with this last-chance bearing removal possibility. Pry or cut off the outer cage to release the bearing rollers. Then, use a thin grinding wheel or metal saw to cut a slot in the inner race. Impacting the slot area with a cold chisel should split the race and help free its metal grip. We’ve seen front or rear spindles toast a wheel bearing due to lack of lubricant, overload, or some other cause. In those situations, this can be a handy trick.