H01 VEHICLE DRIFT - Alfa - 156 - eLearn

3233043 - H01 VEHICLE DRIFT

Whilst driving in a straight line, the vehicle tends to drift towards the right and/or the left.If necessary, carry out a test on a straight, flat road with no cambers.Check the effective deviation from the trajectory by, very carefully, loosening your grip on the steering wheel

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 tyres are correctly fitted and that the wheels are correctly fixed	Continue to Step 1	Tyre inflation pressure not correct	Restore the tyre inflation pressures
			Tyres not suitable or worn	Replace the tyres
			Fitting tyres	Swap the two front wheels
			Wheel fixing not correct	Tighten the wheels correctly Op. 4450B10
1	WHEEL CHECK	All OK	Problems met	Operation
	Check: that the wheels are properly balanced that the wheels rotate freely (correct fitting of brake calipers)	Continue to Step 2	Wheels not balanced	Balance the wheels
			Incorrect fitting of front brake calipers	Restore the correct fitting or replace the brake calipers Op. 3310A30
			Incorrect fitting of rear brake calipers	Restore the correct fitting or replace the brake calipers Op. 3310B36
2	FRONT WHEEL GEOMETRY CHECK	All OK	Problems met	Operation
	Check the front wheel geometry and angles, Op. 4450A10	Continue to Step 3	Geometry not correct	Replace the suspension springs Op. 4410A10
	Check the front wheel geometry and angles, Op. 4450A10	Continue to Step 3	Angles not correct	Restore, where possible, the correct angles
3	CHECK REAR WHEEL GEOMETRY	All OK	Problems met	Operation
	Check the rear wheel geometry and angles Op. 4450A40	Continue to Step 4	Geometry not correct	Replace the suspension springs Op. 4420A10
	Check the rear wheel geometry and angles Op. 4450A40	Continue to Step 4	Angles not correct	Restore, where possible, the correct angles
4	UNDERBODY CHECK	All OK	Problems met	Operation
	Visually inspect the underbodyCheck that there are no accidental blows, dents or bent suspension arms	Continue to Step 5	Damage, in particular to the front suspension	Restore or replace the damaged components
5	WHEEL BEARINGS CHECK	All OK	Problems met	Operation
	Check the condition and operation of the wheel hub bearings	Continue to Step 6	Front wheel bearing worn or damaged	Replace the wheel hub bearing Op. 4450C32
	Check the condition and operation of the wheel hub bearings	Continue to Step 6	Rear wheel bearing worn or damaged	Replace the wheel hub bearing Op. 4450D14
6	FLEXIBLE MOUNTINGS AND BUSHES, FRONT AREA, CHECK	All OK	Problems met	Operation
	Check the condition of the bushes and mountings. In the order: steering box rods flexible supports for front selector forks and track control arms anti-roll bar flexible mountings	Continue to Step 7	Steering box rods worn or damaged	Replace the rods Op. 4110B14
			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
7	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 8	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 crossmeber faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to torque Op. 4410D13
8	DIFFERENTIAL CHECK	All OK	Problems met	Operation
	Check the condition of the differential: in particular make sure that there are no clearances	Continue to Step 9	Differential operation faulty	Overhaul or replace the differential (see OVERHAULING GEARBOXES Assembly 2110D)
9	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'