1948-1952 Shop Service Manual - - Hudson-Essex-Terraplane Club

11 - 16 REAR AXLE
16. Lower car and remove jacks.
AXLE NOISE
MAINTENANCE
Difficulties with universal joints, muffler roar, tire noises,
wheel bearings, body drumming and etc., are at times
improperly diagnosed as rear axle noise. Therefore, after
checking all possible external causes, the following items
on road test should be considered:
1. Select a level, asphalt or tarvia road as this type of road
surface minimizes tire noise.
2. Drive car far enough to bring axle lubricant to operating
temperature.
3. A heavy pitched continuous hum, which increases as the
car speed is increased, is noticeable on acceleration between
the speeds of 15 to 45 miles an hour, and is most
pronounced between the speeds of 22 to 35 miles an hour
indicates that:
A. The axle shaft, drive pinion, or differential bearings are
improperly adjusted.
B. Differential ring gear and pinion tooth contact is improperly
set.
4. Coast noise will be more pronounced by allowing the car
to coast from the speed of 45 miles an hour, through the
speed range of 15 miles an ,hour, with clutch engaged and
throttle closed; if the noise is heavy and irregular on the
coast:
A. Check condition of wheel bearings.
B. Check drive pinion adjustment. If necessary, move
pinion out away from ring gear, but never more than .006".
5. Bearings improperly adjusted, worn, scored, or rough will
aggravate axle noises. Bearing noise m ay be distinguished
from the previously mentioned type by:
A. Very irregular drive noise on acceleration.
B. Very rough and irregular coast noise on deceleration.
C. A pronounced knocking or clicking is caused by bearings
that have "dug in" or brinnelled.
REFERENCE
Source of
Information
Date
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