What is the replacement method for rear axle oil seal leakage?
2 Answers
Replacing a leaking rear axle oil seal requires professional tools and can be done at a 4S shop. Below is relevant information about oil seals: 1. Function: During operation, the lip of the oil seal forms a sealing contact band 0.25–0.5mm wide under radial pressure. Under the pressure of the lubricating oil, a very thin oil film forms between the oil seal edge and the rotating shaft. The oil film, influenced by the surface tension of the oil, creates a 'meniscus' at the outer edge of the rotating shaft and the oil seal lip to prevent oil leakage, thereby achieving a sealing effect. 2. Working principle: In a free state, the inner diameter of the oil seal lip is smaller than the shaft diameter, creating a certain interference fit. After installation, the interference pressure of the oil seal edge and the contraction force of the self-tightening spring generate a certain radial pressure on the rotating shaft.
The rear axle oil seal leakage must be repaired promptly, otherwise the gear oil will leak out and the rear axle gears will wear out quickly. I encountered this issue with my own car and had a friend help me fix it. The first step is to park the car on a level surface, engage the handbrake, and lift it using a jack or a lift, then remove the rear wheels. Next, locate the leaking rear axle oil seal, usually near the half-shaft, and remove the half-shaft bolts and axle. Carefully remove the old oil seal with tools and clean any dirt from the mating surface. Press the new oil seal in evenly, apply some special sealant to prevent future leaks, and reassemble the components. Finally, don’t forget to refill with new gear oil to the specified level and take a test drive to check for leaks. The whole process takes about an hour, but it’s best done by someone experienced, as beginners might install parts backward and damage the machinery.
