NISSAN 43252-VH300 Rear Axle Shaft Oil Seal

The Nissan 43252-VH300 (alternative OEM reference: 43252VH30A) is a premium quality rear axle shaft oil seal (shaft seal) designed to perform critical sealing functions within the rear suspension and drivetrain system.

Function and Operating Principle

The primary function of the rear axle shaft oil seal is to form a reliable barrier between the rear differential gear oil and the exterior environment. It prevents lubricant from leaking out of the axle housing while protecting the axle shaft bearing and brake assembly from external contamination. Additionally, it shields internal rotating components from dust, water, and road debris, ensuring the long service life of the drivetrain.

Technical Specifications and Construction

• Fitting Position: Rear axle (left or right side)
• Seal Type: Radial shaft seal with garter tension spring and auxiliary dust lip (Double Lip)
• Material: High heat- and oil-resistant elastomer (NBR/ACM), resistant to modern gear lubricant additives and frictional heat
• OEM Reference Numbers: NISSAN 43252-VH300, 43252VH30A

Symptoms and Consequences of Wear

The oil seal is subject to natural wear and degradation due to continuous rotational movement and temperature fluctuations. Seal failure is commonly indicated by the following symptoms:

• Oil Leakage: Oil stains or wetness appearing on the inner side of the rear wheel, on the brake backing plate, or around the brake drum.
• Reduced Braking Performance: Leaking gear oil that reaches brake pads or brake shoes drastically lowers friction, resulting in a dangerous reduction in braking power.
• Differential Noise: Ongoing oil loss leads to insufficient lubrication in the differential, causing accelerated wear and a humming, whining, or grinding noise.

When replacing the oil seal, it is recommended to inspect the surface of the axle shaft as well, as scoring or wear grooves on the shaft can cause premature failure of the new seal.