S10 ENGINE WHILSTLING / SERVICES BELT NOISY' - Alfa - 156 - eLearn

3233152 - S10 ENGINE WHILSTLING / SERVICES BELT NOISY'

There is a whistling (extremely high intensity noise) coming from the area of the engine which varies with the engine speed

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the auxiliary shaft drive belt and check that the tension is correctCheck that, as the electrical loads engaged increase, the whistling does not increase, but remains constant	Continue to Step 1	Tension incorrect	Replace the belt Op. 1092G10
			The whistling increases: alternator faulty (voltage regulator not working properly)	Replace the voltage regulator Op. 5530A22
			The whistling increases: alternator faulty (connections between alternator and battery not correct)	Restore the connections ( See E5010 STARTING AND RECHARING
1	CHECK AUXILIARY SHAFT BELT	All OK	Problems met	Operation
	Disconnect the belt to see if the whistling stops. ATTENTION do not run the engine too long with the belt disconnected	The whistling disappears: Continue to Step 2	The whistling remains constant	Restore the belt control system, in particular, belt tensioner P Op. 1092G10
2	CHECK ON COMPONENTS DRIVEN BY THE BELT	All OK	Problems met	Operation
	Check the operation of all the components driven by the belt: water pump power assisted steering pump air conditioning compressor	Continue to Step 3	Water pump faulty	Restore or replace the water pump Op. 1088C12
			Power assisted steering pump faulty	Restore or replace the water pump Op. 4130B20
			Air conditioning compressor faulty	Restore or replace the compressor Op. 5040A20
3	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'