H21 STEERING WHEEL OSCILLATIONS/ VIBRATIONS / WITH THE VEHICLE STATIONARY - Alfa - 156 - eLearn

3233049 - H21 STEERING WHEEL OSCILLATIONS/ VIBRATIONS / WITH THE VEHICLE STATIONARY

With the engine running and the vehicle stationary, the steering wheel oscillates and vibrates

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the tyre inflation pressurePreliminarily check the engine idle speed	Continue to Step 1	Engine idle irregular	See table D10
		Continue to Step 1	Tyre inflation pressure not correct	Restore the tyre inflation pressures
1	ENGINE SUPPORT CHECK	All OK	Problems met	Operation
	Check the condition and the centering of the front crossmember and the engine supports and reaction rod	Continue to Step 2	Engine supports faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008A)
			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)
			Engine support crossmember faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque Op. 4410D13
2	STEERING COLUMN CHECK	All OK	Problems met	Operation
	Check the condition and the efficiency of the steering column support. In particular, check: that there is no clearance between the support bushes and the steering column that the steering column joints are correctly tightened	Continue to Step 3	Bushes worn or damaged	Restore the efficiency of the steering column. If necessary, replace the bearings involved Op. 4110A30
		Continue to Step 3	Spider joint clearance too large	Tighten the bolts or replace the steering column Op. 4110A30
3	STEERING WHEEL ADJUSTMENT DEVICE CHECK	All OK	Problems met	Operation
	Check th condition of the steering wheel adjustment device. In particular check: that the clearance between the device and the steering column is correct	Continue to Step 4	Coupling with excessive clearance	Restore the efficiency of the steering wheel adjustment device. If necessary, replace it
4	TIMING CHECK	All OK	Problems met	Operation
	Check that the engine timing is correct	Continue to Step 5	Timing not correct	Restore the correct engine timing Op. 1032B14
5	FLYWHEEL BALANCE CHECK	All OK	Problems met	Operation
	Check that the flywheel balance is correct	Continue to Step 6	Balance not correct	Replace the flywheel Op. 1024B10
6	CHECK 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'