Aligning your ride
By
Jeffrey Fazio
Special Sections Writer
Ever
feel out of whack? Maybe the vehicle does, too. Like a human skeleton,
the configuration of a vehicle’s steering and suspension framework
can be knocked out of alignment by excessive stress or a sudden
impact.
When
a person needs to be straightened out, the solution is an adjustment
from a chiropractor. Similarly, when a vehicle’s geometry needs
tweaking, the answer is a wheel alignment by an automotive technician.
When
is an alignment is needed?
Jason
Knowles, service technician at Bob Fisher Chevrolet Inc., Reading,
recommends having the alignment checked if unusual tire wear is
noticed or if the car’s steering pulls while driving.
"Pulling
and drifting are not the same thing," Knowles cautioned.
"When a car pulls you have to use constant physical force to hold
the car straight."
He
went on to explain that drifting is the gradual tendency of the
vehicle to move across a lane while driving in a straight line, which
is usually caused by uneven road surface. Macadam roads taper downward
toward the edges, which affect the tracking of a car.
Another
thing to check is whether or not the steering wheel is centered. If a
steering wheel is centered, when it is held straight the car will
travel straight. If the steering wheel is not centered the car will
turn while the wheel is held straight.
If
a customer has concerns about their alignment, the first thing Knowles
does is a road test to verify that there is a problem. If a problem is
noticed, he checks to make sure there is correct air pressure in the
tires. Under- or over-inflated tires will throw off the configuration
of a car just like a pair of bad shoes can throw off a person’s
step. Next he examines the components of the steering and suspension
systems to look for worn parts or excessive play.
If
all is fine with these parts, he brings the car in for the alignment.
Like a chiropractor leading a patient onto an adjusting table, he
drives the car onto the alignment rack for adjustment.
"Once
the car is on the alignment rack, I can check the camber, toe and
caster of the car," Knowles explained.
Camber
was described by Knowles as being the angle or tilt of the wheel from
top to bottom. He explained toe as the angle or tilt of the wheel from
front to back. Caster is the angle or relationship between the upper
and lower ball joints, he said. All vehicles have a unique range of
acceptable adjustments based on factory recommendations.
William
Dubble, a Ford master certified suspension technician at Wernersville
Ford Inc., Wernersville, described the different symptoms associated
with problematic camber, toe and caster.
He
explained a problem with camber may cause a slight pull, but most
noticeable would be excessive tire wear on either the inside or
outside edges of the tires. Likewise, he said that misaligned toe
would also cause tires to wear unevenly on either the inside or
outside edges. Dubble went on to say that incorrect caster would cause
a serious pulling problem in the steering.
Bob
Fisher Chevrolet Inc. and Wernersville Ford Inc. both supply alignment
customers with a before and after copy of their alignment as most
shops do.
John
Stone, service manager at Wernersville Ford Inc., said that since
Firestone (safety issues), customers are more aware of their tires. He
said they are asking more questions about tire wear. He suggested
having a vehicle’s alignment checked at least once a year, even if
it is only a road test by a technician.
Dubble
explained that not all cars need all four wheels aligned. He
recommends a complete four-wheel alignment on all front-wheel-drive
cars and any car that has four-wheel independent suspension. He
clarified that some rear-wheel-drive cars — especially older models
— do not have the capability of having the rear wheel geometry
adjusted. Since the parts on the rear of these cars are not
adjustable, they are either in line or damaged and need to be
replaced.
It
is natural to expect that the human body comes pre-aligned and this
expectation is particularly true of a new car. Knowles and Dubble both
pointed out that new cars are aligned before they leave the
manufacturer. In the unlikely event that a car’s alignment was
affected during transportation, it would normally be noticed during
the road test during the dealer’s inspection of the car.
Although
it is not as critical as a dislocated vertebrae, a bad alignment can
seriously affect a car’s driveability. It is certainly something
that can be ignored, like pain in the lower back that won’t go away,
but in the end tattling tire wear and road wandering will tell all.
|