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Fiat 500 Factory Service Manual (2007-2024)22 · Fault diagnosis
22 · Diagnostics

Excessive oil consumption

Make
Fiat
Model
500 Factory Service Manual
Year
2007–2024
Section
Consumption /leaks/ wear › Excessive oil consumption
Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

1.2 8v, 1.3 Multijet, 1.4 16v

The engine seems to be running smoothly, but the fuel consumption is higher than ever before.

High consumption during the first few thousands of Km of the vehicle''s life is considered normal.

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

Visually check for any leaks that could have caused the high consumption.

Check that there is no engine oil in the coolant, also check that the exhaust tail pipe is not dirty with oil and check that there are no bluish exhaust fumes

Move on to Step 1

1. Obvious oil leaks.

2.Engine oil in the cooling circuit.

3. Exhaust tail pipe dirty with oil.

4. Presence of bluish exhaust fumes.

1. Locate and eliminate the oil leaks.

2. Move on to Step 1.

3. Move on to Step 1.

4. Move on to Step 1.

1CYLINDER HEAD OIL PENETRATION CHECKAll OKProblems encounteredOperation

Remove the head and check:

  • no carbon deposits in the combustion chambers and on the inlet valves
  • no wear on the valve stems
Move on to Step 2Excessive clearance between the valve stem and valve guide and between the valve stem and oil seal

Replace the damaged/worn components

Op. 1016E10 SINGLE CYLINDER HEAD, REMOVED - OVERHAUL

2ENGINE OIL PENETRATION CHECKAll OKProblems encounteredOperation

Check the piston seals, in particular:

  • that they are not broken or damaged;
  • that the seals are correctly fitted;
  • that there is no seizing in the piston ring grooves.
Move on to Step 3

1. Piston rings damaged or seized.

2. Piston rings not correctly fitted.

1. Replace the pistons, gudgeon pins and rings.

2. Fit the piston rings correctly.

3CYLINDER BORE CHECKAll OKProblems encounteredOperation

Check:

  • the condition of the surfaces and the dimensions (ovality/taper) of the cylinder bores;
  • piston-bore fitting clearance.
End of diagnosis

1. Bore surfaces do not conform.

2. Dimensions outside of the tolerance.

3. Fitting clearance not correct.

1. Regrind the cylinder bores.

2. Regrind the cylinder bores.

3. Replace the pistons, gudgeon pins and piston rings following the fitting clearances.

Parts & tools for this job For 2007 Fiat 500

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