22 · Diagnostics

Excessive oil consumption

Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

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

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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	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	Continue to Step 1	Obvious oil leaks	See table X12
		Continue to Step 1	Oil unsuitable	Top up with correct type of oil
1	CYLINDER HEAD OIL PENETRATION CHECK	All OK	Problems met	Operation
	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	Continue to Step 2	Excessive clearance between the head components Head components damaged or distorted	Replace the components involved Op. 1016E10
2	PISTON OIL PENETRATION CHECK	All OK	Problems met	Operation
	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	Continue to Step 3	Piston rings damaged or seized Rings incorrectly fitted	Replace the piston rings Op. 1028H11
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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