22 · Diagnostics

Engine oil leaks

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

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Fault diagnosisEngine oil leaks

ENGINE OIL LEAKS

1.6 TS, 2.0 TS

A leak of engine oil can be seen with dripping and/or fouling of the engine

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily carry out a visual inspect to locate the component or area which is leaking. If the visual inspection is not sufficient, wash the engine, dry it and cover the parts involved in talc: road test the vehicle to identify the leak	Continue to Step 1	Leak from the drain plug	Continue to Step 1
			Leak from the sump	Continue to Step 2
			Leak from the oil filter	Continue to Step 3
			Leak from the engine gaskets	Continue to Step 4
			Oil in the cooling circuit	Continue to Step 5
1	DRAIN PLUG CHECK	All OK	Problems met	Operation
	Check the condition and the seal of the oil drain plug	Continue to Step 2	Tightening of drain plug not correct	Restore the correct tightening
2	OIL SUMP CHECK	All OK	Problems met	Operation
	Check: the condition of the oil sump; the seal of the sealant between the sump and the crankcase that the bolts fixing the sump are correctly tightened	Continue to Step 3	Oil sump damaged or distorted	Replace the oil sump Op. 1020A20
		Continue to Step 3	Lack of sealant or tightening not correct	Restore the correct tightening
3	OIL FILTER CHECK	All OK	Problems met	Operation
	Check: the condition of the oil filter; the seal and condition of the gasket for 1.6 120 hp and 2.0 engines, condition of water-oil heat exchanger	Continue to Step 4	Oil filter damaged or distorted	Replace the oil filter and gasket Op. 1004B30
		Continue to Step 4	Heat exchanger with oil leaks	Replace heat exchanger Op. 1084C10
4	ENGINE GASKETS CHECK	All OK	Problems met	Operation
	Gain access to the crankshaft and camshaft oil seals Check the seal of these gaskets	Continue to Step 5	Crankshaft gaskets damaged	Replace the gaskets involved
		Continue to Step 5	Camshaft gaskets damaged	Replace the gaskets involved
5	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

A leak of engine oil can be seen with dripping and/or fouling of the engine

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily carry out a visual inspect to locate the component or area which is leaking. Check the engine oil pressure No leak located	Continue to Step 1	Leak located in the upper part of the enigne	Continue to Step 3
		Continue to Step 1	Leak located in the lower part of the enigne	Continue to Step 8
1	LEAK ORIGIN CHECKS	All OK	Problems met	Operation
	Wash the engine, dry it and apply talc to the parts concerned; road test the vehicle to check that there are no leaks.	Continue to Step 9	Leaks located	Continue to Step 0
2	CHECK FOR LEAKS IN UPPER PART OF THE ENGINE	All OK	Problems met	Operation
	Check that there are no leaks: camshaft housing gasket; camshaft side seals; cylinder head gasket	Continue to Step 9	Leaks from the camshaft housing	Replace the gaskets and seals involved
			Leaks from the camshafts	Replace the gaskets and seals involved
			Leaks from the cylinder head gasket	Replace the gaskets and seals involved
3	CHECK FOR LEAKS IN LOWER PART OF THE ENGINE	All OK	Problems met	Operation
	Check that there are no leaks: Oil drain plug; Oil sump; Oil filter Crankshaft side gaskets	Continue to Step 9	Leaks from the oil drain plug	Continue to Step 4
			Leaks from the oil sump	Continue to Step 5
			Leaks from the oil filter	Continue to Step 6
			Leaks from the crankshaft gaskets	Continue to Step 7
4	DRAIN PLUG CHECK	All OK	Problems met	Operation
	Check the condition and the seal of the oil drain plug	Continue to Step 5	Tightening of drain plug not correct	Tightening of drain plug not correct
5	OIL SUMP CHECK	All OK	Problems met	Operation
	Check: The condition of the oil sump; The seal of the sealant between the sump and the crankcase; That the bolts fixing the sump are correctly tightened	Continue to Step 6	Oil sump damaged or distorted	Replace the oil sump Op. 1020A20
		Continue to Step 6	Lack of sealant or tightening not correct	Restore the correct tightening
6	OIL FILTER CHECK	All OK	Problems met	Operation
	Check: The condition of the oil filter; The seal and condition of the gasket	Continue to Step 7	Oil filter damaged or distorted	Replace the oil filter and gasket Op. 1084B30
7	ENGINE GASKETS CHECK	All OK	Problems met	Operation
	Gain access to the crankshaft gaskets and check their seal	Continue to Step 8	Crankshaft gaskets damaged	Replace the gaskets involved
	Gain access to the crankshaft gaskets and check their seal	Continue to Step 8	Camshaft gaskets damaged	Replace the gaskets involved
8	OIL PRESSURE RELIEF VALVE CHECK	All OK	Problems met	Operation
	Check the condition of the oil pump pressure relief valve	Continue to Step 9	Valve stuck in closed position	Replace the oil pump Op. 1084B16
9	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 2000 Alfa Romeo 147

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