Proper press-fitting and torque tightening (TT08 022)

Proper press-fitting and torque tightening (TT08 022)
Generation 1 hub units – Proper
press-fitting & torque tightening
TT 08-022
June 2008
Revised July 2011
Page 1
Tech tip
The Generation 1 hub unit is a double-row ball bearing with a one-piece outer ring and a split or two-piece inner ring.
It is pre-adjusted, greased and sealed for long life. When replaced, it requires careful attention to the mating
components and the press-fit and torque procedures for that specific application. The following information provides
general tips for proper bearing installation.
FWD bearing installation
1. Loosen the axle nut while the vehicle is still on the ground. Do
not re-use the old nut. Never use an impact gun on the axle nut.
2. To avoid damage to components, be sure to use the proper
specialized pullers to remove the CV joint, hub and knuckle from
the bearing.
3. Inspect all components for signs of fatigue or damage.
(see figure 1) Check bearing mounting bore for distortion or
out-of-roundness. Any irregularities will improperly load the
bearing and cause premature failure, so replace if in doubt.
4. Clean the bearing area in the knuckle and hub to facilitate
smooth insertion. A light coating of lubricant can be applied to
the knuckle cavity and hub to ease installation and inhibit
5. When press-fitting the bearing into the knuckle, be sure to apply
pressure only to the outer ring. (see figure 2) When pressing the
hub into the inner ring, force must only be applied to the inner
ring and the hub. (see figure 3 on 2nd page) The application of force
to the wrong part of the bearing will render it useless by severely
damaging the balls and raceways. After each step, check for
binding or damage by rotating the bearing to be sure it turns
smoothly. Press-fitting locks the bearing radially but to lock it
axially, be sure to install the snap ring where required.
6. On older or higher mileage vehicles, consider installing a new
CV joint boot as a good preventive measure. Manufacturer’s
recommend replacement after 60,000 miles.
Figure 1. Inspect the knuckle for
signs of fatigue or distortion of
the bore. Replace it if in doubt.
Figure 2. Press the bearing into
the knuckle by applying force only
to the outer ring of the bearing.
Generation 1 hub units – Proper
press-fitting & torque tightening – cont.
TT 08-022
June 2008
Revised July 2011
Page 2
7. Lightly lubricate and then carefully align the splines of the CV
shaft with the splines of the hub to prevent damage. Using the
proper tool, pull the axle yolk into the hub and seat against the
bearing. Install a new axle nut, using the specific torque nut for
that application. With the vehicle on the ground, do the final
torquing to the OEM specifications. This assures the proper
mating of the split inner rings of the bearing needed to achieve
the proper internal clearance. (For torque specifications please
refer to the Torque Spec Guide catalog (457377) posted on the website.)
For specific mounting instructions, refer to the vehicle manufacturer’s
service manual for that model.
Figure 3. Press the hub into the
bearing by applying force only to
the inner ring and hub.
For safety’s sake, never re-use the axle nut. Most self-locking
nuts are deformed to hold torque loads and therefore lose
their holding ability once they have been used.
SKF Front wheel drive hub and bearing kits
When a Gen 1 hub unit wheel bearing is worn or damaged, it is often more than just the bearing that should be replaced.
There is a good possibility that the wheel hub has been damaged in service or during the removal process. Therefore when
the repair service is performed on the bearing, the hub and accessory components (locking nut, circlip) should be replaced.
To service these applications, SKF has front wheel drive wheel bearing kits to provide all the critical parts you need. The
unique feature of these applications is that the bearing is pressed into the rear of the steering knuckle while the hub is
pressed in from the front. Below is an example of a few of the kits available.
Front wheel hub
Repair kit
Ford Taurus: 1991-1995 (From 2/91)
Mercury Sable: 1991-1995 (From 2/91)
Lincoln Continental: 1992-1994
hub, bearing, circlip and axle nut
Ford Escort, EXP: 1983-1990 (From 2/83)
Ford Tempo: 1984-1994
Mercury Lynx, LN7: 1983-1987 (From 2/83)
Mercury Topaz: 1984-1994
hub, bearing, circlip and axle nut
Honda Accord: 1982-1985
Honda Prelude: 1983
hub, bearing, seals and axle nut
Toyota Camry: 1983-1991
hub, bearing and seal kit
Geo Prizm: 1993-1997
Toyota Corolla: 1987-2002
hub, bearing and seal kit
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