22 · Diagnostics

Excessive oil consumption

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: Consumption /leaks/ wear › Excessive oil consumption

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Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

1.6 TS, 2.0 TS

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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the level of the engine oil is not high Op. 1048A10 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 X12 ENGINE OIL LEAKS
			Oil level outside the limits	Restore the correct level Op. 1084A10
			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. 1016C10 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. 1016E10
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. 1004B10
			Cylinder liners/bore vitrified	Regrind the cylinder
			Machining grooves	Regrind the cylinder
			Seals faulty	Replace the circlips Op. 1028H60
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'

1.9 JTD 16V

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	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
	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, following the fitting clearances
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

All versions

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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: if there is service information on the subject no water or other fluids in the fuel tank	Continue to Step 1	Presence of dirt in the fuel tank	Clean the fuel tank
1	ROAD TEST THE VEHICLE	All OK	Problems met	Operation
	With the engine at operating temperature and after a long period of deceleration, check when then accelerating whether the problem is considerably worse	Continue to Step 2	Increase in acceleration fumes (after deceleration) caused by oil from the piston rings or valve guides	Continue to Step 3
2	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gases intake circuit. In particular, check that there are no obstructions in the separator or in the pipes	Continue to Step 3	Fault in the pipe from separator to intake	Restore the correct operation of the circuit: if necessary, replace the pipes
		Continue to Step 3	Fault in separator (rocker cover)	Restore the correct operation of the circuit; if necessary replace the rocker cover
3	CHECKING CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Remove-refit the cylinder head: Check the condition of the cylinders/piston rings the seal of the valve oil seals	Continue to Step 4	Wear on cylinders/piston rings outside tolerance	Restore the correct clearances
		Continue to Step 4	Valve oil seals leaking	Replace the oil seals, if necessary, overhaul the head
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

3.2 V6

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

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: no water or other fluids in the fuel tank engine oil level	Continue to Step 1	Presence of dirt in the fuel tank	Clean the fuel tank
		Continue to Step 1	Level too high	Top up the engine oil level
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the engine management control unit: in error mode that there are no faults	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
2	CHECKING BLOW-BY CIRCUIT	All OK	Problems met	Operation
	Check the condition of the blow-by gases intake circuit. In particular, check that there are no obstructions in the separator or in the pipes	Continue to Step 3	Fault in the pipe from separator to intake	Restore the correct operation of the circuit: if necessary, replace the pipes
		Continue to Step 3	Fault in separator (rocker cover)	Restore the correct operation of the circuit; if necessary replace the rocker cover
3	CHECK ON CYLINDER COMPRESSION	All OK	Problems met	Operation
	Carry out the cylinder compression test	Continue to Step 5	Cylinder compression insufficient	Continue to Step 4
4	CHECKING CAUSE OF INSUFFICIENT COMPRESSION	All OK	Problems met	Operation
	Remove-refit the cylinder head: Check the condition of the cylinders/piston rings the seal of the valve oil seals	Continue to Step 5	Wear on cylinders/piston rings outside tolerance	Restore the correct clearances
		Continue to Step 5	Valve oil seals leaking	Replace the oil seals, if necessary, overhaul the head
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Excessive fuel consumption Next › Engine coolant consumption

Parts & tools for this job For 2000 Alfa Romeo 147

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