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Show WHAT NOT TO DO WITH CAR MOTOR Worn Pinions and Differential Bearings Are Result of . Poor Driving of Auto. (By KRWIN GREER. President Greer College of Automotive Engineering;, Chicag-o.) Rar axles today as a whole are mighty well made but they would give far better and longer service If the driving were properly done. Quick engagement of the clutch, heavy overloads, even though for an instant, harsh application of brakes on rough roads, and lack of lubrication lubrica-tion are some of the causes of worn pinion and differential bearings and worn gears. Cause of Unpleasant Noises. The average car has an adjustable driving plnloo and differential unit. When new these bevel gears operate so that the gears mesh In one certain way. If a bearing wears and allows the pinion tr change Its mesh, or if the differential bearings wear and allow al-low the whole unit to shift away from or toward the pinion, there Is bound to be a noise produced and noise of an unpleasant character. Gears Not Running True. The bearings, if they are of the ball type with ball separators or cages, may show a breaking down of the cage. Pieces of the cage fall between the gear teeth, chipping them and causing more noise. The bearings themselves then allow more freedom of movement of the differential or pinion. It is absolutely necessary that the two gears remain in a fixed position, posi-tion, and as soon as there is an unusual un-usual noise from the axle, it is a warning warn-ing that the gears are not running true or tluit there is solid matter between the teeth. |