12 · Diagnostics

X15 Gearbox/differential oil leakages

DiagnosisX15 Gearbox/differential oil leakages

Inspect the gearbox/differential for oil leakages.

Often the fault is associated to gearbox noise with the vehicle stationary and in neutral: also see table S22

Step	Validity	Operation to be performed	Test results
Step	Validity	Operation to be performed	OK	⚠	🔧
1		CHECK GEARBOX/DIFFERENTIAL OIL LEVEL Check gearbox/differential oil level PROCEDURE OP. 2110A04	All OK Go to Step 2	Problems found Insufficient level	Intervention Restore correct level and run a road test. If the fault persists, go to Step 2
2		CHECK LEAKAGES Wash the gearbox carefully. Sprinkle it with talcum powder. Run a road test. Visually check for leakages. In particular, check intactness of the following seals: – gearbox shaft inlet seal – rear cover seal – differential oil seal	All OK Go to Step 3	Problems found Leakages from seals	Intervention Replace seals PROCEDURE OP. 2110C22, 2110C30
				Leakages from differential oil seals	Replace oil seals PROCEDURE OP. 2110D60
3		CHECK GEARBOX Visually check intactness of gearbox	All OK Go to Step 4	Problems found Damaged or distorted box	Intervention Replace gearbox, PROCEDURE OP. 2110C12, rear cover PROCEDURE OP. 2110C30 or entire gearbox unit
4		CHECK CORRECT OPERATION Check the fault is no longer present	All OK End of test	Problems found Fault persists	Intervention Seek the fault starting from another symptom

Parts & tools for this job For 1998 Fiat Seicento

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