S40 NOISE' FRONT / DRIVING IN A STRAIGHT LINE ON AN EVEN ROAD - Alfa - 156 - eLearn

3233165 - S40 NOISE' FRONT / DRIVING IN A STRAIGHT LINE ON AN EVEN ROAD

With the vehicle moving along a straight, even road, there is a noise from the front, often accompanied by vibrations.As the speed of the vehicle increases, so too does the noise

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily, check the type, condition and inflation pressure of the tyres	Continue to Step 1	Pressure not correct	Restore the tyre inflation pressures
		Continue to Step 1	Tyres not suitable or worn	Replace the tyres
1	WHEEL BEARINGS CHECK	All OK	Problems met	Operation
	Carry out a test, gradually steering to the right or the left; check whether the intensity of the noise increases	The noise remains constant: Continue to Step 2	The noise increases greatly with the steering angle: bearing worn or damaged	Replace the wheel hub bearing Op. 4450C32
2	INTERMEDIATE SHAFT CHECK	All OK	Problems met	Operation
	Especially if the fault is accompanied by vibrations Check: the operation of the intermediate shaft bearing the condition of the intermediate shaft	Continue to Step 3	Intermediate shaft worn or distorted	Replace the intermediate shaft Op. 2710A31
		Continue to Step 3	Intermediate shaft bearing worn	Replace the intermediate shaft bearing Op. 3710A32
3	WHEEL CHECK	All OK	Problems met	Operation
	Check: that the wheels are properly balanced the condition of the wheel rims	Continue to Step 4	Wheels not balanced	Balance the wheels
		Continue to Step 4	Wheel rims dented or distorted	Replace the wheel rims
4	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'