22 · Diagnostics

Excessive oil consumption

Fault diagnosisExcessive oil consumption

EXCESSIVE OIL CONSUMPTION

2.0 16V JTD, 2.2 16V JTD

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

N.B.: excessive consumption during the first few thousands of Km of the vehicle''s life is considered normal.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually check for any leaks that could have caused the high consumption;	Move on to Step	Obvious oil leaks	Locate the leaks and eliminate them
1	CYLINDER HEAD OIL PENETRATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Remove the head and check:	Move on to Step	Excessive clearance between the valve stem and valve guide and between the valve stem and oil seal	Replace the damaged/worn components < R1 >
2	ENGINE OIL PENETRATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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	1. Piston rings damaged or seized	1. Replace the pistons, gudgeon pins and rings
		Move on to Step	2. Piston rings not correctly fitted	2. Fit the piston rings correctly
3	CYLINDER BORE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: The condition of the surfaces and the dimensions (ovality/taper) of the cylinder bores; Piston-bore fitting clearance;	Move on to Step	1. Bore surfaces do not conform	1. Regrind the cylinder bores
			2. Dimensions outside of the tolerance	2. Regrind the cylinder bores
			3. Fitting clearance not correct	3. Replace the pistons, gudgeon pins and piston rings following the fitting clearances
4	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

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