Subaru LEGACY 2002 Quick Reference Index page 366

Differentials
2. Limited Slip Differential (LSD)
A: OUTLINE
The limited slip differential is of a viscous coupling (V/C) type which automatically limits the differ-
ential action and distributes torque to the left and right wheels adequately to enhance driving sta-
bility when the left and right wheels are rotating at speeds different from each other during driving
on a slippery road (muddy, snow-covered or slushy road) or cornering.
B: STRUCTURE
The V/C type LSD has outer plates and inner plates arranged alternately. Each outer plate is
splined to the inside of the differential case at its outer periphery and each inner plate is splined
to the outer circumference of the left side gear at its inner periphery.
The inner plates are held in position by spacer rings while the outer rings can slide in the axial
direction along the spline teeth.
The space between the differential case and the left side gear is filled with a mixture of high vis-
cosity silicone oil and air and hermetically sealed with X-rings.
(1) Spacer ring
(2) Inner plate
(3) Outer plate
(4) X-ring
(5) Pinion shaft
LIMITED SLIP DIFFERENTIAL (LSD)
DI-4
(6) Pinion gear
(7) Side gear (right)
(8) Differential case
(9) Side gear (left)
(10) X-ring
S3H0174B