22 · Diagnostics

Engine'buzzing

Fault diagnosisEngine'buzzing

ENGINE'BUZZING

There is a constant, loud noise coming from the area of the engine, which is only heard within a certain engine speed range

0	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the condition and seal of the air supply circuit	Continue to Step 1	Circuit component damaged	Replace the component (see Assembly 1048A)
1	ENGINE SUPPORT CHECK	All OK	Problems met	Operation
	Check the condition and the correct fixing of the engine supports and flexible mountings and the reaction rods	Continue to Step 2	Engine supports faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008A)
			Flexible mountings faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008B)
			Reaction rod faulty	Bed in the fixings: loosen the bolts, centre them in their housings and tighten them to the recommended torque (see Assembly 1008C)
2	ENGINE EXHAUST CHECK	All OK	Problems met	Operation
	Check the condition and the correct fixing of the engine exhaust pipe flexible supports	Continue to Step 3	Support slack or damaged	Restore or replace the support (see Assembly 1076A)
		Continue to Step 3	Pipe, silencer or connector damaged	Replace the components (see Assembly 1076B)
3	CHECKING 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'

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