Purpose: to prevent transmission fluid leakage from the AL4 automatic transmission oil pump.
Location: Between the oil pump housing and the transmission housing.
Design:
* Circular rubber part with metallized reinforcing ring.
* Has inner and outer diameters that correspond to the diameters of the oil pump shaft and gearbox housing.
* The outer lip of the seal is usually slightly chamfered or beveled to provide a better seal.
Function:
* Creates a tight seal to prevent transmission fluid from leaking out of the oil pump.
* Keeps oil under pressure inside the automatic transmission system.
Malfunctions:
* Wear or Damage: Over time, the seal rubber can become worn or damaged, causing leakage.
* Incorrect installation: Improper installation of the seal may result in leakage or rapid failure of the seal.
*High Pressure: If the transmission fluid pressure exceeds normal levels, it may cause the seal to be pushed out or ruptured.
Signs of malfunction:
* Leakage of transmission fluid from under the automatic transmission.
* Reduced transmission fluid level.
* Slipping or uneven gear shifting.
Replacement:
Replacing the oil pump seal of an AL4 automatic transmission requires special tools and skills. It is recommended that you have this work done by a qualified mechanic.