16 · Diagnostics

X05 Excessive oil consumption

Fault diagnosisX05 Excessive oil consumption

The engine is running smoothly, but the oil consumption is higher than previously recorded during the life of the vehicle.

NOTA: high consumption during the first few thousand kilometres is considered normal.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Visually check for any leaks which could have caused the high consumption Check that the type of oil is suitable for the engine in question	OK	Move onto step 1
		Obvious oil leaks	Move onto step (see X12)
		Oil unsuitable	Top up with correct type of oil End of diagnosis
1	CYLINDER HEAD OIL PENETRATION CHECK Remove the cylinder head and check: that there is no oil in the combustion chambers and on the inlet valves that the valve stems are not worn	OK	Move onto step 2
1		Excessive clearance between the head components Head components damaged or distorted	Replace the components involved Op. 1016E10 End of diagnosis
1	CYLINDER HEAD OIL PENETRATION CHECK Remove the cylinder head and check: that there is no oil in the combustion chambers and on the inlet valves that the valve stems are not worn	OK	Move onto step 2
1		Excessive clearance between the head components Head components damaged or distorted	Replace the components involved Op. 1016E26 End of diagnosis
2	PISTON OIL PENETRATION CHECK Check the piston rings, in particular: that they are not broken or damaged that the actual rings are correctly fitted that there is no seizing or sticking in the grooves	OK	Move onto step 3
2		Piston rings damaged or seized Rings incorrectly fitted	Replace the piston rings Op. 1028H11 End of diagnosis
3	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 1997 Alfa Romeo 156

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