H20 STEERING WHEEL OSCILLATIONS/ VIBRATIONS / WHILST DRIVING - Alfa - 166 - eLearn

3308645 - H20 STEERING WHEEL OSCILLATIONS/ VIBRATIONS / WHILST DRIVING

The steering oscillates rapidly along a straight road at sustained speed.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check the type, condition and inflation pressure of the tyresCheck that the wheels are correctly fixed.	Continue to Step 1	Tyre inflation pressure not correct	Restore the tyre inflation pressure
			Tyres unsuitable or worn	Replace the tyres
			Wheel fixing not correct	Tighten the wheels correctly Op. 4450B10
1	WHEEL CHECK	All OK	Problems met	Operation
	Verify: that the wheels are properly balanced the condition of the wheel rims (there should not be dents or distortions)	Continue to Step 2	Wheels not balanced	Balance the wheels
		Continue to Step 2	Wheel rims dented or distorted	Replace the wheel rims
2	WHEEL ALIGNMENT CHECK	All OK	Problems met	Operation
	Check the alignment of the wheels	Continue to Step 3	Alignment not correct	Restore the correct wheel alignment
3	ENGINE SUPPORT CHECK	All OK	Problems met	Operation
	Check the condition and the centering of the engine supports and the reaction rod	Continue to Step 4	Engine supports faulty	Loosen the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008A)
		Continue to Step 4	Reaction rod faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008C)
4	BUSHES AND FLEXIBLE MOUNTINGS CHECK	All OK	Problems met	Operation
	Check the condition of the bushes and mountings. In order: steering box rods flexible supports for front selector forks and track control arms anti-roll bar flexible mountings	Continue to Step 5	Steering box rods worn or damaged	Replace the steering box Op. 4130A10
			Arm supports worn or damaged	Replace the supports (see Assembly 4410B)
			Selector fork supports worn or damaged	Replace the supports (see Assembly 4410A)
			Anti-roll bar mountings worn or damaged	Replace the mountings Op. 4410C12
5	SPRING/SHOCK ABSORBER ASSEMBLY CHECK	All OK	Problems met	Operation
	Verify: the condition and the efficiency of the shock absorbers and the springs the fixings for the spring/shock absorber assembly	Continue to Step 6	Tightening not correct	Restore the correct fastening
			Shock absorbers not working properly	Replace the shock absorber involved Op. 4410A12
			Springs not working properly	Replace the spring involved Op. 4410A12
6	STEERING TIE-RODS AND ARMS CHECK	All OK	Problems met	Operation
	Check the condition of the steering tie-rods and arms.	Continue to Step 7	Rods or arms damaged or worn	Replace the steering box Op. 4130A10
7	STEERING COLUMN BEARINGS CHECK	All OK	Problems met	Operation
	Check the condition and the efficiency of the steering column support bearings	Continue to Step 8	Bearings worn or damaged	Restore the efficiency of the steering column If necessary, replace the bearings involved Op. 4110A30
8	HECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'