Exam 10: Four Wheel Alignment Part 2 Diagnostic Angles and Frame Damage

When reading dimensions on a unitized body chart, capital letters indicate:

Describe the turning angles on the front wheel when cornering, and explain why these angles are necessary.

Frame sag is the result of frame rails being bent downward in relation to the center of the frame.

Which of these alignment angles assists in the return of the steering wheel to the straight-ahead position?

Technician A says the tram gauge pointers should be at a specified measurement for each frame measurement location. Technician B says frame measurements can be made with three tram gauges installed across the frame at various locations to check frame sag. Who is correct?

Technician A says vehicle tracking is the parallel relationship between the front and rear wheels. Technician B says vehicle tracking is the parallel relationship between the front cross member and the rear cross member. Who is correct?

Turning radius may be referred to as cornering angle.

On a car with a MacPherson strut front suspension, a 6 degree difference in left and right SAI angles may cause what during braking?

Side sway is the vertical misalignment that affects the frame or body centerline.

All of these statements about vehicle tracking are true EXCEPT:

Technician A says rear axle sideset does not affect steering. Technician B says if rear axle sideset occurs, the rear axle is moved inward or outward. Who is correct?

Technician A says if the turning radius is not within specifications, tire tread wear is excessive while cornering. Technician B says a bent steering arm causes the turning radius to be out of specifications. Who is correct?

Ultra high-strength steel may be used to manufacture what parts of a unitized body?

Technician A says steering pull when braking may be caused by unequal SAI angles on the front suspension. Technician B says front tire tread wear may be caused by unequal SAI angles on the front suspension. Who is correct?

Front tires that are larger than specified may change the scrub radius from positive to negative.

Technician A says buckle on the front of the frame reduces the distance between the front bumper and the cowl. Technician B says frame buckle may be caused by a side collision. Who is correct?

The section modulus of a frame is a measure of a frame's strength based on all of these factors EXCEPT:

The vehicle wheelbase is the distance between:

Scrub radius is the distance between the SAI line and the true vertical centerline of the tire and wheel at the road surface.

Technician A says if a rear axle is offset, the rear axle is turned so one rear wheel is moved rearward and the opposite rear wheel is moved forward. Technician B say if the right rear wheel is moved forward and the left rear wheel is moved rearward, the steering pulls to the left. Who is correct?