- Carry out an initial visual inspection to locate the component that is leaking or the area of the leak.

- 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 check is not sufficient, wash the engine, dry it and start slowly to bring it up to the correct temperature. Test the watertightness of the system to identify the leak

Op. 0510C30 ENGINE COOLING SYSTEM - LEAKAGE TEST

1. Leaks from pipes

2. Leak from the radiator

3. Leak from the expansion tank

4. Leak from the water pump

5. Leak from the thermostat unit

6. Leak from the cylinder head

7. Leak from the heater radiator

8. Oil or water leaking between the engine and the cooling circuit

1. Move on to Step 1

2. Move on to Step 2

3. Move on to Step 3

4. Move on to Step 4

5. Move on to Step 5

6. Move on to Step 6

7. Move on to Step 7

8. Move on to Step 8

Check the condition of the pipes and the seal. More specifically:

- the condition of the bands making sure they are correctly fitted;

- the condition of the hoses, connectors and plugs

Replace the radiator

Op. 1088B20 ENGINE COOLING RADIATOR - R + R

Visually check:

- the condition of the expansion tank;

- the tap seal. Check the condition of the plug breather valve

Visually check:

- the condition of the water pump;

- the seal of the gaskets

Replace the water pump or the gaskets

Op. 1088C14 WATER PUMP - R + R WITH TIMING BELT(S) REMOVED

Visually check:

- condition of the thermostat unit;

- the seal of the gaskets

Replace the thermostat unit or the gaskets

Op. 1088C40 THERMOSTAT- R + R

Check:

- that the cylinder head is correctly tightened;

- the seal of the gasket

1. Cylinder head tightening incorrect

2. Gasket damaged

1. Restore correct tightening

2. Replace the gasket

Replace the heater radiator

Op. 5040C54 AIR CONDITIONING HEATER RADIATOR - R+R WITH AIR CONDITIONING CASING REMOVED

Remove the cylinder head.

Op. 1016C10 SINGLE CYLINDER HEAD - R.R. AND REPLACE GASKET

Check that there are no leaks:

- oil deposits on valves;

- defects on engine block;

- defects on cylinder head gasket

1. Cylinder block plane defective

2. Oil deposits on the valves

1. Level the engine block

2. Overhaul the head

Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL