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15 Cards in this Set
- Front
- Back
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What are the typical steering complaints?
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- looseness
- wander - pull - binding - vibration - noises - poor assist - off-centre steering wheel |
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What are the problems related to steering systems?
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- Steering Linkage
- steering Gears (looseness, roughness and binding) |
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What are the types of power steering problems?
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- Noises (squealing / buzzing caused by loose belt or low fluid level)
- Assist problems - Power Steering pull (self-steer) - Leakage |
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Poor power assist that occurs ONLY when the system is cold is called morning sickness.
What is the probable cause? |
internal leakage around the directional control valve due to wear in the flow control valve housing bore
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One very common steering complaint is steering wheel position.
What is the cause of this? |
incorrect tracking or improper toe adjustment
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What is the highest contributing factors to understeer / oversteer?
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- tire structure
- tread design - and inflation (pressure) due to great variations in slip angle |
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What causes bump steer?
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- unequal toe change
- changes in rear thrust angle during jounce and rebound (worn bushings or bent rear suspension components) |
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What causes memory steer?
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- binding ball joints or upper strut bearings
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What causes tire squeal on turns at low speed?
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incorrect turning radius (bent steering arm)
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What causes body roll?
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- weak or broken stabilizer bar
- worn or broken stabilizer links or bushings - excessive loading of vehicle - low tire pressures - load rating of tires too low - excessive speed on corners |
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What causes scrub radius?
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- mismatched tires or wheels
- uneven tire pressures - bent steering knuckles |
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What is the primary aim of high SAI?
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improve vehicle directional stability at high speed, especially during emergency manoeuvres causing tire blowout.
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If included angle measurements are correct (equal), you can be sure that the spindles / struts are NOT bent.
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..
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If camber and SAI are both incorrect and opposite, what needs to be corrected to correct both camber and SAI?
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the engine cradle
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Never use heat to straighten or repair steering or suspension components. Why?
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Heating or welding can drastically affect the strength of the metal and integrity of the component, possibly making the vehicle unsafe to drive. Replacement is the only method.
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