Oil-lubricated Front Wheel Bearings
During normal vehicle duty cycle, the lubricant and air inside the
hub/wheel cavity expands and, if not vented, causes pressure build-up
that could cause accelerated seal wear. You can use two venting methods
to prevent pressure build-up:
•
A slit or small hole in the rubber check vent
•
The window.
Over a period, if not routinely cleaned, a slight film of oil can collect dirt
around the rubber fill plug and face, which could appear to be a leak.
Routine cleaning helps make sure that you can easily observe the
lubricant level through the window as intended. In situations where the
window is clean on the outside but discolored on the inside, you can
check the lubricant level by inserting a finger through the rubber check
vent hole.
The specified lubricant level for a window-type hubcap is from the
minimum line to five–sixteenth inch (8 millimeters) above the minimum
line. If the lubricant level should suddenly drop dramatically below the
minimum level, see the
Workshop Manual
for diagnostic procedure.
Installation, Tightening and Alignment
Make sure the threads on the studs and nuts are clean to permit correct
torque when installing wheels. The mounting surfaces of rims, wheels,
spacer rings and clamps must be free of dirt, rust, lubricants or damage.
Use a wire brush to clean the mounting contact surfaces. Do not use
lubricant on threads.
After properly tightening the rim or wheel, check it for proper alignment.
Rotate the wheel with a piece of chalk attached to a steady, firm surface,
and placed to just barely clear the outside surface of the tire bead seat;
this procedure points out the high spot. A high spot does not necessarily
indicate unevenly tightened lug nuts, but may be the result of a bent
wheel.
Use the following installation procedure:
1. Slide inner rear or front tire and wheel in position over studs and push
it back as far as possible. Use care so you do not damage the threads on
the studs.
250
Wheels and Tires
2015 F-650/750
(f67)
Owners Guide gf
(ownloose)
, 1st Printing, December 2013
Canadian_French
(fr_can)