Why Does a Car Transmission Leak Oil?
2 Answers
The reasons for car transmission oil leakage are: 1. Aging and deformation of oil seals, spring detachment, or incorrect installation direction of oil seals; 2. Pipeline damage; 3. Loose screws on the transmission cover; 4. Damage to the joint surface of the transmission case; 5. Excessive clearance at shaft ends; 6. Wear of oil seals or flanges, with gear oil exceeding the specified standard; 7. Improper use of lubricating oil. Methods to address car transmission oil leakage: 1. Wipe the oil traces with a cloth or tissue and inspect the leaking part; 2. Tighten the nuts at the connection points; 3. Replace the gasket and replenish oil in the transmission; 4. Weld and repair the worn parts or replace the components.
I've encountered transmission oil leaks several times, with several main causes: The most common is aging oil seals or gaskets, where rubber materials harden and shrink over time, losing elasticity and causing sealing failure; The transmission housing may have minor cracks from impacts, allowing oil to slowly seep out; Improper installation is also an issue, such as loose screws or misaligned gaskets after repairs, leading to minor leaks; Sometimes overfilling the oil or blocked ventilation holes can increase internal pressure, forcing oil to overflow. These situations are more likely to occur in hot weather or after long-distance driving. I've found that small leaks, if not addressed promptly, can accelerate internal component wear, leading to gear shifting issues or unusual noises, significantly increasing repair costs. Therefore, regularly checking the transmission oil level and the chassis for oil stains, and replacing the oil and seals every two years can prevent problems before they occur.
