22 · Diagnostics

Excessive oil consumption

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Consumption /leaks/ wear › Excessive oil consumption

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Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

2.0 JTS, 3.2 V6, 1.9 JTD 16V

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

1.8 T.SPARK

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

2.0 JTS, 3.2 V6, 1.9 JTD 16V

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

1.8 T.SPARK

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the level of the engine oil is not high Op. Op. 1048A10 AIR CLEANER FILTERING ELEMENT - REPLACE Check that there is no engine oil in the coolant Check that the end of the exhaust pipe is not dirty with oil Check whether there is blueish smoke in the exhaust Carry out a consumption test	Continue to Step 1	Engine oil leaks	See table See table X12 ENGINE OIL LEAKS
			Oil level outside the limits	Restore the correct level Op. Op. 1084A10 PIPE FROM SENDER UNIT TO ENGINE OIL PRESSURE W/L - REPLACE
			Oil in the cooling circuit	Continue to Step 2
			Exhaust tail pipe dirty with oil	Continue to Step 2
			Exhaust fumes	Continue to Step 2
			Excessive consumption	Continue to Step 2
1	SPARK PLUG CHECK	All OK	Problems met	Operation
	Check that there is no oil fouling the spark plugs	Continue to Step 2	Spark plugs fouled by oil	Continue to Step 2
2	CYLINDER BLOCK/CRANKCASE PLANE CHECK	All OK	Problems met	Operation
	Remove the cylinder head Op. Op. 1016C10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL That that the following are absent: oily dross on the valves; defects in the cylinder block/crankcase plane; defects in the cylinder head gasket;	Continue to Step 3	Cylinder block/crankcase plane defective	Reface the cylinder block/crankcase
		Continue to Step 3	Presence of oily dross on the valves	Overhaul the cylinder head Op. Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
3	CYLINDER LINER/BORE CHECK	All OK	Problems met	Operation
	Check the cylinder liners/bores. In particular: no deep machining scoring; no vitrification of the liners/bores; make sure that there is no ovality or wear	Continue to Step 4	Deep scoring or excessive ovality	Replace the engine Op. Op. 1004B10 POWER UNIT WITH MANUAL GEARBOX - R + R
			Cylinder liners/bore vitrified	Regrind the cylinder
			Machining grooves	Regrind the cylinder
			Seals faulty	Replace the circlips Op. Op. 1028H60 PISTON, PIN SET - REPLACE
4	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''

2.0 JTS, 3.2 V6, 1.9 JTD 16V

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: Whether there is service information on the subject Possible leaks	Continue to Step 1	Obvious oil leaks	Continue as instructed See table See table X12 ENGINE OIL LEAKS
1	CYLINDER HEAD OIL PENETRATION CHECK	All OK	Problems met	Operation
1.9 JTD 16V 2.0 JTS	Remove the cylinder head [PR_1016C10] 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. Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL
3.2 V6	Remove the cylinder head [PR_1016D11] 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. Op. 1016E26 CYLINDER HEADS - OVERHAUL
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 Op. Op. 1028H60 PISTON, PIN SET - REPLACE
		Continue to Step 3	Piston seals not correctly fitted	Fit the seals correctly
3	CYLINDER LINER/BORE CHECK	All OK	Problems met	Operation
	Check: 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, respecting the fitting clearances Op. Op. 1028H60 PISTON, PIN SET - REPLACE
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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