Subaru 1600 Service Manual page 395

REAR WHEEL DRIVING SYSTEM (4WD MODEL)
Symptom and possible cause
"
Remedy
Noises when curving
•
Damaged differential gear.
Replace.
•
Excessive wear or damage of thrust washer.
Replace.
•
Broken pinion mate shaft.
Replace.
•
Seized or damaged side bearing.
Replace.
Gear noises
Since noises from engine, muffler, transmission, propeller shaft, wheel bearings, tires, and body are sometimes
mistaken for noises from differential assembly, be careful in checking them. Inspection methods to locate noises
include coasting, accelerating, cruising, and jacking up all four wheels. Perform these inspections according to
condition of trouble. When listening to noises, shift gears into four wheel drive and fourth speed position, trying to
pick up only differential noise.
•
Improper tooth contact of hypoid gear.
Readjust or replace hypoid gear set.
•
Improper backlash for hypoid gear.
Readjust.
•
Scored or chipped teeth of hypoid gear.
Replace hypoid gear set.
•
Seized hypoid gear.
Replace hypoid gear set.
•
Improper preload for front or rear bearings. Readjust.
•
Seized, scored, or chipped front or rear bearing. Replace.
• Seized, scored, or chipped side bearing. Replace.
•
Vibrating differential carrier. Replace.
2. Propeller Shaft
Trouble and possible cause Remedy
Vibration of propeller shaft
Vibration is caused by propeller shaft during operation and transferred to vehicle body. Generally vibration increases
in proportion to vehicle speed.
•
Worn or damaged universal joint needle bearing. Replace.
•
Unbalanced propeller shaft due to bend or dent. Replace.
•
Loose installation of propeller shaft. Retighten.
Tapping when starting and noise while cruising, caused by propeller shaft.
•
Worn or damaged universal joint. Replace.
•
Worn spline of sleeve yoke.
Replace.
•
Loose installation of propeller shaft. Retighten.
•
Loose installation of joint. Adjust snap ring.
8-18
,
~
... , .•. "' .......
,'4u~~
.•. "'lI._
? "