The main reasons for oil leakage from an automatic transmission:
1. Old or damaged gaskets and seals:
* Gaskets and seals wear out over time, cracking or shrinking, causing leaks.
2. Damage to the gearbox housing:
* Prolonged exposure to corrosion, impact or other external damage may cause cracks or holes in the transmission housing.
3. Wear of the transmission filter:
*A clogged or faulty transmission filter can cause pressure to build up in the transmission, which can lead to leaks.
4. Incorrect fluid level:
* Insufficient or excessive transmission fluid levels can lead to leaks due to excessive pressure or reduced lubrication.
5. Damage to the torque converter:
*A faulty or damaged torque converter can cause fluid to leak from the front of the transmission.
6. Wear or damage to oil seals:
* Transmission seals seal connections between shafts and housing, wear or damage to which can lead to leaks.
7. Damage to the gearbox sump:
*Impact or corrosion can damage the transmission pan, causing fluid leaks.
8. Incorrect installation:
* Improper installation of transmission parts such as gaskets or seals may cause leaks.
9. Overpressure:
* Biting transmission parts or other internal problems can create excessive pressure, which can lead to leaks.
10. Poor quality or contamination of the fluid:
* Fluid of poor quality or contaminated with dirt or metal particles can impair seal performance and cause leaks.