A January 95 TSB discusses how to tighten the lug and axle nuts
properly (I don't have this TSB).
A Subaru Service Helpline Update, SHNO495,April, 1995 states:
"When replacing rear wheel bearings on all-wheel drive SVX vehicles,
be certain not to over torque the lateral link bolt that secures
the two transverse suspension arms to the wheel bearing housing.
DO NOT AIR GUN THE BOLT OFF.
Refer to appropriate manuals for the proper torque specs. If
this bolt is over torqued, it can deform the housing and may lead
to a repeat failure of the wheel bearing. If you encounter a repeat
failure of a rear wheel bearing occurring in an unreasonably short
amount of miles, the housing may have been deformed during the
first repair. Replacement of the bearing and the housing may be
Other things to remember when working on wheel bearings. Never
loosen or tighten the axle nut with the weight of the vehicle
on the wheel. Vehicle should be in the air with the wheel removed
prior to loosening or tightening the axle nut. If this precaution
is not taken, damage to the wheel bearing may occur.
The axle nuts are NOT reusable. A new nut should be used with
the new bearing. Always insure that the new bearing is properly
packed with suitable wheel bearing grease. The grease that is
shipped with the bearing is NOT sufficient. Always use the proper
special tools to install the bearing and torque the the axle nut
to correct specifications".
Also, Subaru Service Helpline, June 1993, states:
"Whenever wheel bearings are being replaced or serviced, always
make sure they are properly packed with high temperature wheel
bearing grease. The light grease found on the new wheel bearings
is for storage to prevent the bearings from becoming oxidized".