What are the causes of transmission oil leakage in small cars?
2 Answers
Transmission oil leakage in small cars can be caused by issues such as aging lines. Factors causing oil leakage at the oil seal neck: Oil seal aging and deformation, oil seal spring detachment, or incorrect installation direction of the oil seal can all cause the oil seal to lose its oil-blocking function. The aged or deformed oil seal should be replaced. Line factors: If the lines are damaged, oil may leak from the damaged part of the pipeline during circulation. Factors at the gearbox joint surface: If the joint surface of the gearbox is damaged, an appropriately thickened paper gasket should be added at the damaged area. If oil leakage persists, welding repair should be performed. Function of transmission oil: Transmission oil serves purposes such as lubrication, cooling, and rust prevention. Leakage of transmission oil can cause significant damage to various components of the transmission, so regular maintenance is essential.
I've seen too many cars with transmission oil leaks, and this issue deserves a thorough discussion. The most common cause is aging oil seals—the rubber rings around the front and rear shafts of the transmission harden and crack over time, allowing oil to seep out through the gaps. Another frequent issue is the deterioration of the oil pan gasket, especially for vehicles frequently driven on rough roads. After the undercarriage takes a hit, the bolts can loosen, causing the gasket to deform. Additionally, improperly tightened fill ports or drain plugs during oil changes can lead to leaks, while overtightening risks stripping the threads. Leaks from the axle seals are also troublesome; if you notice oily residue near the inner wheels, it's a red flag. Once, I encountered an owner who used low-quality sealant during a DIY oil change, resulting in oil leaking faster than it was being added. My advice: if you spot oil stains under your car, don’t delay—get it on a lift and inspected immediately. Running a transmission dry can lead to catastrophic failure.
