S41 NOISE' FRONT / WHILST DRIVING OVER UNMADE ROAD - Alfa - 156 - eLearn

3233166 - S41 NOISE' FRONT / WHILST DRIVING OVER UNMADE ROAD

With the vehicle driving over an umade road or one with a large number of bends, noise can be heard from the front.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Road test the vehicle on an unmade road or one with a large number of bends to identify the type of noise:	Unspecified noise: Continue to Step 1	The noise is a creaking	Continue to Step 1
			The noise is a hissing	Continue to Step 4
			The noise is a knocking	Continue to Step 6
1	SUSPENSION COMPONENTS CHECK	All OK	Problems met	Operation
	Check the front suspension components for any signs of rubbing: between the suspension arm bushes and washers between the dust cover and the shock absorber between the end of travel buffer and the housing	Continue to Step 2	Signs of rubbing	Lubricate or replace the components involved (see Subassembly 4410A)
2	ANTI-ROLL BAR TIGHTENINGS CHECK	All OK	Problems met	Operation
	Check the condition of the anti-roll bar flexible mountings and that they are correctly tightened	Continue to Step 3	Anti-roll bar mountings worn or not tightened	Restore the tightenings, lubricate, or replace the mountings Op. 4410C10
3	ENGINE COMPARTMENT FIXINGS CHECK	All OK	Problems met	Operation
	Check that the pipes and shields are correctly positioned and fixed in the engine compartment	Continue to Step 7	Components not properly connected causing interference	Suitably tighten the pipes or shields involved
4	SHOCK ABSORBER CHECK	All OK	Problems met	Operation
	Check for any friction between the shock absorber stem and the seal	Continue to Step 5	Signs of rubbing	Lubricate or replace the shock absorber Op. 4410A12
5	WHEEL BEARINGS CHECK	All OK	Problems met	Operation
	Check the operation of the front wheel hub bearing	Continue to Step 7	Bearing worn or damaged	Replace the wheel hub bearing Op. 4450C32
6	BUSHES AND FLEXIBLE MOUNTINGS CHECK	All OK	Problems met	Operation
	Check the condition of the bushes and mountings and that they are correctly tightened In the order: front selector fork flexible supports track control arm ball joints shock absorber attachment mounting	Continue to Step 7	Arm supports worn or damaged	Replace the supports (see Assembly 4410B)
			Selector fork supports worn or damaged	Replace the supports (see Assembly 4410A)
			Shock absorber attachment mounting damaged	Replace the mounting Op. 4410A12
7	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'