B2CB1PK1 - 607 4HP20 AUTOMATIC GEARBOX
DIAGNOSIS OIL LEAK
A low fluid level can cause a drop in pressure or premature wear of the clutches .
IMPERATIVE : after any repair, check the fluid level .
4HP20 AUTOMATIC GEARBOX
| reference | cause of the leaks | remedies |
|---|---|---|
| 1 | heat exchanger | check the presence and condition of the oil seals on the banjo bolts replace the seals or the exchanger |
| 3 | sump gasket | check the tightening of the bolts, replace the sump gasket (comply with the tightening torque) |
| 4 | selector shaft between the multifunction switch and the gearbox casing | check condition of the seal |
| 5 | fluid tube link between the front cover and the gearbox casing | check the sealing rings check the tightening visual check of the tube |
| 6 | front cover | check the sealing rings check the tightening and condition of the O-ring |
| 7 | electrical connector | check the sealing ring and tightening |
| 8 | fluid drain bolt : gearbox, differential | check the sealing ring and tightening |
| 9 | engine/gearbox clamp at the converter | condition of the converter sealing ring check whether it is engine oil or gearbox fluid (crankshaft/converter sealing ring) |
| 10 | gearbox breather | check the fluid level |
| 11 | left hand drive shaft | condition of the lip seal |
| 12 | right hand drive shaft | condition of the lip seal |
| 13 | between the gearbox casing and the converter housing | seal damaged gearbox replacement (if necessary) |
| 14 | converter housing overflow bolt | condition, tightening |