22 · Diagnostics

Engine whilstling / services belt noisy

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Noisy'' / vibrations › Engine whilstling / services belt noisy

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Fault diagnosisEngine whilstling / services belt noisy

ENGINE WHILSTLING / SERVICES BELT NOISY

A high frequency noise is heard from the engine, whose intensity varies with the number of revs

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 correct. See if the whistling stays constant as more electrical loads are conneced.	Continue to Step 1	Belt worn.	Replace the belt Op. Op. 1092G10 SINGLE ENGINE BELT R R
			Tension incorrect	Adjust belt tension
			The whistling noise increases.	Continue to Step 1
1	ALTERNATOR CHECK	All OK	Problems met	Operation
1.9 JTD 16V 2.0 JTS	Check that the alternator is working properly, in particular Voltage regulator The connections between the alternator and the battery	Continue to Step 2	Defective voltage regulator	Replace the voltage regulator Op. Op. 5530A22 ALTERNATOR VOLTAGE REGULATOR - R+R
1.9 JTD 16V 2.0 JTS		Continue to Step 2	Connections not correct	Restore the connections
3.2 V6	Check that the alternator is working properly, in particular: Voltage regulator The connections between the alternator and the battery	Continue to Step 2	Defective voltage regulator	Replace the voltage regulator Op. Op. 5530A24 ALTERNATOR VOLTAGE REGULATOR - R R WITH ALTERNATOR REMOVED
3.2 V6		Continue to Step 2	Connections not correct	Restore the connections
2	CHECK AUXILIARY SHAFT BELT	All OK	Problems met	Operation
	Check whether the whistling disappears when the belt is disconnected. Do not let the engine run for long with the belt disconnected	Continue to Step 3	The whistling disappears:	Continue to Step 3
		Continue to Step 3	The whistling remains constant	Continue to Step 4
3	AIR CONDITIONER COMPRESSOR CHECK	All OK	Problems met	Operation
	Check the air conditioner air conditioner compressor is working properly.	Continue to Step 4	Air conditioner compressor faulty	Repair or replace the compressor Op. Op. 5040A20 AIR CONDITIONER COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY
4	CHECK BELT TENSION	All OK	Problems met	Operation
	Check the condition of the belt tension bearings	Continue to Step 5	Fixed belt tensioner fault	Replace the fixed belt tensioner Op. Op. 1092G20 ENGINE COMPONENT SINGLE BELT FIXED TENSIONER - ONE - R + R
	Check the condition of the belt tension bearings	Continue to Step 5	Mobile belt tensioner fault	Replace the mobile belt tensioner Op. Op. 1092G14 ENGINE COMPONENT SINGLE BELT MOBILE TENSIONER - R + R
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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