X05 EXCESSIVE OIL CONSUMPTION - Alfa - 156 - eLearn

3233209 - X05 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 consumptionCheck 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
1.6 TS 1.8 TS [d] 1.9 JTD 8v 2.4 JTD 10v	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 componentsHead components damaged or distorted	Replace the components involved Op. 1016E10
2.5 V6	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 componentsHead components damaged or distorted	Replace the components involved Op. 1016E26
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 seizedRings 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'

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
	First check: whether there is service information on the subject for possible leaks	Continue to Step 1	Obvious oil leaks	Locate the leaks and eliminate them
1	CYLINDER HEAD OIL PENETRATION CHECK	All OK	Problems met	Operation
	Remove the cylinder head and check: That there are no carbon deposits in the combustion chambers and on the inlet valves That the valve stems are not worn	Continue to Step 2	Excessive clearance between the valve stem and valve guide and between the valve stem and oil seal	Replace the damaged/worn components Op. 1016E10
2	ENGINE OIL PENETRATION CHECK	All OK	Problems met	Operation
	Check the piston seals, 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 seals damaged or seized	Replace pistons, pins and seals
		Continue to Step 3	Piston seals not correctly fitted	Fit the seals correctly
3	CYLINDER LINER/BORE CHECK	All OK	Problems met	Operation
	Verify: The condition of the surfaces and dimensions (ovality/taper) of the cylinder liners/bores; Piston - liner/bore fitting clearance;	Continue to Step 4	Liner/bore surfaces non-compliant	Grind the cylinder liners/bores
			Dimensions outside of the tolerance	Grind the cylinder liners/bores
			Fitting clearance incorrect	Replace the pistons, pins and seals, following the fitting clearances
4	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis