22 · Diagnostics

Engine buzzing

Fault diagnosisEngine buzzing

ENGINE BUZZING

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

0	CHECK BELT TENSION	All OK	Problems met	Operation
		Results of the tests
1.2 8v	Check the belt is not too taut	Continue to Step 2	Belt tension excessive	Restore correct tension Op. 1092B64
1	CHECK BELT TENSION	All OK	Problems met	Operation
1.9 DIESEL	Check the belt tensioners and, in particular, the condition of the bearings	Continue to Step 2	Belt tensioner bearing damaged	Change the mobile belt tensioner Op. 1092G14
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 remains constant	Continue to Step 4
3	ALTERNATOR CHECK	All OK	Problems met	Operation
	Check the alternator and, in particular: The condition of the bearing That the pulley is correctly fixed	Continue to Step 4	Alternator bearing damaged	Overhaul the alternator Op. 5530A18
		Continue to Step 4	Pulley fixing not correct	Restore the correct pulley fastening
4	WATER PUMP CHECK	All OK	Problems met	Operation
	Check the water pump and, in particular the condition of the bearing.	Continue to Step 5	Water pump bearing damaged	Replace the water pump Op. 1088C10
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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