184000600 - X10 ENGINE COOLANT LEAKS

A leak of engine coolant is seen with dripping and/or fouling of the engine
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
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.Continue to Step 8Leak from water pipesContinue to Step 1
Leak from the radiatorContinue to Step 2
Leak from the expansion tankContinue to Step 3
Leak from the water pumpContinue to Step 4
Leak from the thermostat unitContinue to Step 5
Leak from the heater radiatorContinue to Step 6
Outside leak from the cylinder headContinue to Step 7
Leak from cylinder block/cylinder head plugsReplace the plugs
1PIPES CHECKAll OKProblems metOperation

Check the condition and seal of the pipes. In particular:

  • condition and correct fitting of the bands
  • condition of hoses, connectors and plugs
Continue to Step 8Tightening not correct or components damagedRestore the correct tightening or replace the components involved
2CHECK ON RADIATORAll OKProblems metOperation
Check the condition of the radiatorContinue to Step 8Radiator damaged or distortedReaplce the radiator Op. 1088B24
3CHECK EXPANSION TANKAll OKProblems metOperation

Visually inspect:

  • the condition of the expansion tank;
  • the seal of the plug
Check the condition of the breather valve in the cap
Continue to Step 8Tank damaged or distortedReplace the tank or cap Op. 1088B10
4CHECK ON WATER PUMPAll OKProblems metOperation

Visually inspect:

  • the condition of the water pump;
  • the seal of the gaskets
Continue to Step 8Water pump faultyReplace the water pump or the gaskets Op. 1088C12
5THERMOSTAT UNIT CHECKAll OKProblems metOperation

Visually inspect:

  • the condition of the thermostat unit;
  • the seal of the gaskets
Continue to Step 8Thermostat unit faultyReplace the thermostat unit or seals Op. 1088C30
6HEATER RADIATOR CHECKAll OKProblems metOperation
Check the condition of the heater radiatorContinue to Step 8Heater radiator damaged or distortedReplace the heater radiator Op. 5030A50
7CHECKING CYLINDER HEADAll OKProblems metOperation
Remove the head.

Check:

  • That the planarity of the cylinder head plane is correct
  • That the planarity of the cylinder head support surface on the cylinder block is correct;
Continue to Step 8Cylinder head plane defectiveRegrind the cylinder head plane
Cylinder block/crankcase plane defectiveRegrind the cylinder block/crankcase plane
Planes correct, head gasket faultyReplace the cylinder head gasket
8CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis