Main Method
1. If transmission oil leaks are suspected, thoroughly clean the suspected leak.
2. Drive the vehicle for approximately 24 km or until the transmission reaches normal operating temperature.
3. Park the car over clean paper or cardboard.
4. Turn off the engine.
5. Check for oil stains on the paper.
6. Perform the necessary repair procedures.
Powder Method
1. Thoroughly clean areas of suspected leaks with solvent.
2. Apply aerosol leak detection powder to the intended area.
3. Drive the vehicle for 24 km or until the transmission reaches normal operating temperature.
4. Turn off the engine.
5. Check the suspected leak area for streaks on the powder coating to locate the leak.
6. Perform the necessary repair procedures.
Dye and ultraviolet light method
Note. Dye kits and UV lamp kits are commercially available from various manufacturers.
1. Following the manufacturer's instructions, determine the amount of dye needed to detect leaks.
2. Drive the vehicle for 24 km or until the transmission reaches normal operating temperature.
3. Detect the leak with an ultraviolet lamp.
4. Perform the necessary repair procedures.
Finding the cause of the leak
Determine the exact location of the leak and trace its source. In order to correctly eliminate the leak, it is necessary to determine the cause of its occurrence. For example, if the gasket is replaced but the sealing flange is bent, the new gasket will not stop the leak. The bent flange also needs to be repaired. Before proceeding with the repair of the leak, check the following points and, if necessary, correct the malfunctions:
Gaskets
- Too high (-something) fluid level/pressure.
- Clogged vent or drain.
- Incorrect tightening of threaded connections.
- Dirty or damaged threads.
- Scratches, roughness or other damage to sealing surfaces.
- Damaged or worn gasket.
- Cracking or porosity of components.
- Using the wrong sealant,
- Wrong gasket.
Oil seals
- Too high (-something) fluid level/pressure.
- Clogged vent or drain.
- Damaged or worn seal.
- Cracks in components.
- Shaft surfaces are scratched, dented, or damaged.
- Loose or worn bearings due to excessive seal wear.
Possible areas for transmission oil leaks
Transmission valve body cover
- Incorrect bolt tightening.
- Damaged mounting surface.
- Wrong sealant.
Gearbox housing
- Loose or damaged oil cooler lines/seals.
- Worn or damaged drive shaft seal.
- Loose line pressure plugs or level plugs.
Gearbox ventilation system
- System overflow.
- Water or coolant in automatic transmission fluid. The working fluid takes on a milky color. Check installation of ventilation hoses.
- Clogged ventilation.
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