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Control Arm Adjustment

Control Arm Adjustment. Control Arm Movement Concepts Inboard shim adjustment Outboard shim adjustment Slotted frame / Eccentric cam Symmetrical lower arm adjustment Asymmetrical Upper and Lower control arm adjustment . Positive Camber Change (Symmetrical Upper Control Arm).

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Control Arm Adjustment

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  1. Control Arm Adjustment • Control Arm Movement Concepts • Inboard shim adjustment • Outboard shim adjustment • Slotted frame / Eccentric cam • Symmetrical lower arm adjustment • Asymmetrical Upper and Lower control arm adjustment

  2. Positive Camber Change (Symmetrical Upper Control Arm) • Move front and rear of upper control arm outward equal amounts • 1/16” equals 1/4° • 1/8” equals 1/2° • 1/4” equals 1 degree Front

  3. Negative Camber Change (Symmetrical Upper Control Arm) • Move front and rear of upper control arm inward equal amounts • 1/16” equals 1/4° • 1/8” equals 1/2° • 1/4” equals 1 degree Front

  4. Positive Caster Change (Symmetrical Upper Control Arm) • Move the front of the control arm outward and the rear of the control arm inward equal amounts • 1/32” equals 1/2 degree • 1/16” equals 1 degree • 1/8” equals 2° Front

  5. Negative Caster Change (Symmetrical Upper Control Arm) • Move the front of the control arm inward and the rear of the control arm outward equal amounts • 1/32” equals 1/2° • 1/16” equals 1° • 1/8” equals 2° Front

  6. Positive Camber & Caster (Symmetrical Upper Control Arm) • Move the front of the control arm outward • 1/16” equals 1/2° caster & 1/4° camber • 1/8” equals 1° caster & 1/2° camber Front

  7. Negative Camber & Caster (Symmetrical Upper Control Arm) • Move the front of the control arm inward • 1/16” equals 1/2° caster & 1/4° camber • 1/8” equals 1° caster & 1/2° camber Front

  8. Positive Camber & Negative Caster (Symmetrical Upper Control Arm) • Move the rear of the control arm outward • 1/16” equals 1/2° caster & 1/4° camber • 1/8” equals 1° caster & 1/2° camber Front

  9. Negative Camber & Positive Caster (Symmetrical Upper Control Arm) • Move the rear of the control arm inward • 1/16” equals 1/2° caster & 1/4° camber • 1/8” equals 1° caster & 1/2° camber Front Menu

  10. Inboard Shims Front Menu

  11. Camber Increase • Remove equal thickness shim from front and rear • 1/16” = 1/4° • 1/8” = 1/2° • 1/4” = 1° Front Remove Remove Shims

  12. Camber Decrease • Add equal thickness shim from front and rear • 1/16” = 1/4° • 1/8” = 1/2° • 1/4” = 1° Front Add Add Shims

  13. Caster Increase • Remove shim from front and add to rear • 1/32” = 1/2° • 1/16” = 1° • 1/8” = 2° Front Move Shims

  14. Decrease Caster • Remove shim from rear and add to front • 1/32” = 1/2° • 1/16” = 1° • 1/8” = 2° Front Move Shims Menu

  15. Outboard Shim (symmetrical) • Reverse the shim movement shown for Inboard Shims • All other factors stay the same • 1/16” equals 1/4° camber • 1/16” equals 1/2° caster Menu

  16. Slotted Frame Adjustment • Upper Control Arm • Changes Camber and/or Caster • Methods: • Hit and Miss • Slotted Formula Menu

  17. Eccentric Cam Adjustment • Upper Control Arm • Changes Camber and/or Caster • Methods: • Same as slotted control arm • More controllable Menu

  18. Ford / Lincoln/ Mercury • Eccentric Adjusters for front camber and caster. • Loosen lock nut and rotate large lower nut to adjust angles. Menu

  19. Reduce specification tolerances to: .25° (1/4) camber tolerance .50° (1/2) caster tolerance Lock the service brakes Level and lock the front sensors View the front bar graph screen for front camber and caster Slotted Control Arm Formula

  20. Camber and Caster Adjustment • Is the null indicator equal distance from center on both bar graphs? • NO - Requires two moves • YES - Requires one move

  21. Null indicators are not equal • Which end of the control arm must move to make both null indicators move toward the center of their respective graphs? • Camber (+) & Caster (+) - front moves out • Camber (-) & Caster (-) - front moves in • Camber (-) / Caster (+) - rear moves in • Camber(+) / Caster (-) - rear moves out

  22. Null indicators are not equal • Move the control arm until both null indicators are equal distance from the center of their respective graphs.

  23. Null indicators are equal • Move the end of the control arm which will make both null indicators move toward the center of their respective graphs.

  24. Symmetrical Lower Control Arm • Reverse the upper control arm movements • All other factors stay the same • 1/16” equals 1/4° camber • 1/16” equals 1/2° caster Menu

  25. Asymmetrical Control Arm Adjustment • The adjuster furthest from the ball joint will: • have the greatest effect on caster • have the least effect on camber Menu

  26. Add or remove shims equally to change camber Add or remove shims from the pack furthest from the ball joint to adjust caster Asymmetric Upper Control Arms GM G20 Van

  27. Asymmetrical Lower Control Arm • Rotate the eccentric closest to the ball joint to adjust camber • Rotate the eccentric furthest from the ball joint to adjust caster Menu

  28. Common Adjustments Front Suspension Lower control arm Lower strut Upper Strut plate Ball joint Strut rod Bushing or threaded insert Rear Adjustments Common Rear Adjustments Menu

  29. Slotted Lower Control Arm 93 F body

  30. Lower Strut Attachment • Lower attachment bolts may permit camber angle adjustment. • Aftermarket kit may be required.

  31. Upper Strut Plate • Camber and/or caster may be adjusted by repositioning the upper strut mount • Aftermarket kit may be required

  32. Ball Joint • A ball joint may be rotated or repositioned to adjust camber and / or caster.

  33. Strut Rod • Loosen one nut and tighten the other to adjust caster • Washers may also be used

  34. Bushing or Threaded Insert • Camber and / or caster may be adjusted by rotating or replacing the insert bushing. Menu

  35. Typical Rear Adjustments Full Contact Shim Eccentric Cam Tie Rod Lower Strut Slotted Control Arm Wedge Strut Rod Menu

  36. Full Contact Shim • Adjust Rear Camber and Toe using full contact shims • Hunter • Northstar • Specialty

  37. Eccentric Cams • Eccentric cams may be used to adjust rear toe and /or camber

  38. Tie Rods • Adjust rear individual toe using tie rod adjustment

  39. Lower Strut • Rear camber may be adjusted by loosening the lower strut retaining bolts and pulling inward or outward

  40. Slotted Control Arm • Rear lower control arms may be slotted to permit toe and camber adjustments

  41. Wedge • A “wedge” be used to adjust rear camber • Wedges may also be used to adjust front camber

  42. Strut Rod • A rear strut rod may be used to adjust individual rear toe

  43. What Are Equipment Manufacturers Doing To Help Technicians Adjust Various Control Arm Configurations Faster And Better? • A vehicle specific software tool has been developed for vehicles with control arms using shims, cams and slots.

  44. How to turn red bar graphs green fast is the problem – adjust with shims

  45. Corvette with symmetrical A arm - shims outboard of frame – actual shim size

  46. Caprice with symmetrical A arm - shims inboard of frame – actual shim size

  47. Chevy C10 with asymmetrical A arm - shims outboard of frame – actual shim size

  48. Chevy C10 with asymmetrical A arm - shims outboard of frame – actual shim size

  49. Technician time saver – adjust one side only to match the other side

  50. How to turn red bar graphs green fast is the problem – adjust with eccentric cams

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