22 · Diagnostics

Rombosita'' ciclica motore

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Noisy'' / vibrations › Rombosita'' ciclica motore

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Fault diagnosisRombosita'' ciclica motore

ROMBOSITA'' CICLICA MOTORE

There is a constant, loud noise coming from the area of the engine, which is repeated at constant intervals

1	CHECK AUXILIARY SHAFT BELT	All OK	Problems met	Operation
		Results of the tests
	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 2	The whistling disappears:	Continue as instructed See table See table S10 ENGINE WHILSTLING / SERVICES BELT NOISY
		Continue to Step 2	The whistling remains constant	Continue to Step 2
2	CHECKING ALTERNATOR	All OK	Problems met	Operation
1.9 JTD 16V 2.0 JTS	Check the alternator and, in particular the condition of the bearing	Continue to Step 3	Alternator bearing damaged	Overhaul the alternator Op. Op. 5530A18 ALTERNATOR - DISMANTLE AND REBUILD - WASH AND CHECK INCLUDING COMPONENT REPLACEMENT IF NECESSARY
3.2 V6	Check the alternator and, in particular the condition of the bearing that the pulley is correctly fixed	Continue to Step 3	Alternator bearing damaged	Overhaul the alternator Op. Op. 5530A18 ALTERNATOR - DISMANTLE AND REBUILD - WASH AND CHECK INCLUDING COMPONENT REPLACEMENT IF NECESSARY
3.2 V6		Continue to Step 3	Pulley fixing not correct	Restore the correct pulley fastening Op. Op. 5530A30 ALTERNATOR PULLEY OR FAN - R+R WITH ALTERNATOR REMOVED
3	CHECK TIMING BELT TENSION	All OK	Problems met	Operation
	Check the belt is not too taut	Continue to Step 4	Belt tension excessive	Restore correct tension
4	CHECK TIMING BELT TENSIONER	All OK	Problems met	Operation
	Check the belt tensioners and bearing condition in particular the condition of the bearings	Continue to Step 5	Fixed belt tensioner bearing damaged	Replace the fixed belt tensioner Op. Op. 1092G20 ENGINE COMPONENT SINGLE BELT FIXED TENSIONER - ONE - R + R
		Continue to Step 5	Mobile belt tensioner bearing damaged	Change the mobile belt tensioner Op. Op. 1092G14 ENGINE COMPONENT SINGLE BELT MOBILE TENSIONER - R + R
5	CHECK ON WATER PUMP	All OK	Problems met	Operation
1.9 JTD 16V 2.0 JTS	Check the water pump and, in particular, the condition of the bearing	Continue to Step 6	Water pump bearing damaged	Replace the water pump Op. Op. 1088C10 WATER PUMP - R + R
3.2 V6	Check the water pump and, in particular the condition of the bearing	Continue to Step 6	Water pump bearing damaged	Replace the water pump Op. 1088C12
6	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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