Labels:text | screenshot | font | document | black and white | number OCR: BASIC REAR AXLE PROBLEMS First, determine when the noise is most notice- Tire Noise Front Wheel Bearings able. Drive Noise -Produced under vehicle accel- eration. Tire noises are often mistaken for rear axde While holding the car speed steady, lightly apply Coast Noise -Produced while the car coast problems. Snow treads or unevenly wom tires the foot brake; this will often decease bearing with a closed throtde. produce vibrations seeming to originale else- noise, as some of the load is taken from the Float Noise - Occurs while maintaining con- where. Temporarily inflating the tire to 40 lbs bearing- stant car speed just enough to keep speed con- will significanty aller tire noise, but will have no stant) on a level road. effect on rear axle noises (which normally coase below about 30 mph). Rear Axle Noises Road Noise Engine/Transmission Nolse Eliminating other possible sources can narrow the cause to the rear axle, which normally pro- Brick or rough surfaced concrete roads produce Determine at what speed the noise is more pro- duces noisa from wom gears or bearings. Gear noises that seem to come from the rear axle. Road noise is usually identical in Drive or Coast nounced, then stop the car in a quiet place. With noises tend to peak in a narrow speed range. while bearing noises will usually vary in pitch and driving on a different type of road will tell the transmission in Neutral, run the angine with engine speeds. whether the road is the problem. through speeds corresponding to road speeds where the noise was noticed. Noises produced with the car standing still are coming from the engine or transmission. NOISE DIAGNOSIS The Noise Is Most Probably Produced By · Identical under Drive or Coast Different depending on road surface . Road surface, tires or front wheel bearings Road surface or tires Lower as the car speed is lowered Tires . Similar with car standing or moving . Engine or transmission . A vibration Unbalanced tires, rear wheel bearing, unbalanced driveshaft or wom U-joint . A knock or click about every 2 tire revolutions · Rear wheel bearing . Most pronounced on tums Damaged differential gears . A steady low-pitched whirring or scraping, starting at · Damaged or wom pinion bearing low speeds . A chattering vibration on tums . Wrong differential lubricant or wom clutch plates (lim- . Noticed only in Drive, Coast or Float conditions ited slip rear axle) . Wom ring gear and/or pinion gear
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