18 · Diagnostics

X10 Engine coolant leaks

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2002
Section: Consumption / leaks / wear › X10 Engine coolant leaks

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Fault diagnosisX10 Engine coolant leaks

X10 Engine coolant leaks

A leak of engine coolant is seen with dripping and/or fouling of the engine

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Preliminarily carry out a visual inspect to locate the component or area which is leaking. Check that there is no engine oil in the coolant. Check that there is no water or emulsion in the engine oil. If the visual inspection is not sufficient, wash the engine, dry it, start it and run it slowly until it comes up to temperature; to identify the leak, carry out a leak test on the system Op. 0510C30	OK	No leak identified:Move onto step 1
		Leak from the pipes	Move onto step 1
		Leak from the radiator	Move onto step 2
		Leak from the radiator	Move onto step 3
		Leak from the radiator	Move onto step 3
		Leak from the radiator	Move onto step 4
		Leak from the radiator	Move onto step 6
		Leak from the radiator	Move onto step 7
		Leak from the radiator	Move onto step 8
1	PIPE CHECK Check the condition and seal of the pipes. In particular: condition and correct fitting of the bands condition of hoses, connectors and plugs	OK	Move onto step 2
1		Tightening not correct or components damaged	Restore the correct tightening or replace the components involved End of diagnosis
2	RADIATOR CHECK Check the condition of the radiator	OK	Move onto step 3
2	RADIATOR CHECK Check the condition of the radiator	Radiator damaged or distorted	Replace the radiator Op. 1088B20 End of diagnosis
3	CHECK EXPANSION TANK Visually inspect: the condition of the expansion tank; the seal of the plug Check the condition of the breather valve in the cap	OK	Move onto step 4
3		Tank damaged or distorted	Replace the tank Op. 1088B10 or cap End of diagnosis
4	THERMOSTAT UNIT CHECK Visually inspect: the condition of the thermostat unit; the seal of the gaskets	OK	Move onto step 5
4		Thermostat unit faulty	Replace the thermostat unit or the seals Op. 1088C40 End of diagnosis
5	WATER PUMP CHECK Visually inspect: the condition of the water pump; the seal of the gaskets	OK	Move onto step 6
5		Water pump faulty	Replace the water pump or the gaskets Op. 1088C10 End of diagnosis
6	CYLINDER HEAD GASKET CHECK Verify: that the cylinder head tightening is correct the gasket seal	OK	Move onto step 7
		Cylinder head tightening not correct	Restore the correct tightening End of diagnosis
		Gasket damaged	Replace the gasket Op. 1016C10 End of diagnosis
7	CHECK ON HEATER RADIATOR CHECK ON CYLINDER HEAD GASKET Check the condition of the heater radiator	OK	Move onto step 8
7		Heater radiator damaged or distorted	Replace the radiator Op. 5040C50 End of diagnosis
8	CYLINDER BLOCK/CRANKASE SURFACE CHECK Remove the cylinder head Op. 1016C10 Check that the following are absent: oily deposits on the valves; defects in the cylinder block/crankcase surface; defects in the cylinder head gasket;	OK	Move onto step 9
		Cylinder block/crankcase surface defective	Reface the cylinder block/crankcase End of diagnosis
		Oily deposits on the valves	Overhaul the cylinder head Op. 1016E10 End of diagnosis
9	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
9		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev X08 Excessive engine coolant consumption Next › X12 Engine oil leaks

Parts & tools for this job For 2000 Alfa Romeo 147

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