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 CHECKS	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 involved
1	CHECK ON CONDITION OF ENGINE SUPPORTS	All OK	Problems met	Operation
	Check the correct fixing and condition of: Engine supports Flexible mountings Reaction rod	Continue to Step 2	Engine supports fixing not correct	Restore the correct fastening Op. 1008A10
			Gearbox side engine support defective	Replace the gearbox side engine support Op. 1008A42
			Timing side engine support defective	Replace the timing side engine support Op. 1008A46
			Flexible mounting defective	Replace the flexible mounting
			Reaction rod fixing not correct	Restore the correct fastening Op. 1008A10
			Reaction rod defective	Replace the reaction rod Op. 1008C10
2	ENGINE EXHAUST CHECK	All OK	Problems met	Operation
	Check the engine exhaust system and, in particular: Piping Exhaust silencer Catalytic converter front/rear gaskets	Continue to Step 3	Pipe damaged	Replace the pipe
			Front silencer damaged	Replace the silencer Op. 1076B30
			Rear silencer damaged	Replace the silencer Op. 1076B20
			Gasket worn or damaged	Replace the gasket
3	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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