NISSAN 49176-2W200 Power Steering Pump Inlet Connector O-Ring

The Nissan 49176-2W200 genuine (OEM) power steering pump O-ring (inlet connector seal) is a critical sealing component in the vehicle's hydraulic power steering system. This specialized O-ring ensures a hermetic, leak-free connection between the power steering pump inlet connector and the pump housing.

Technical Characteristics and Material Quality

Because the hydraulic fluid within the power steering system is subjected to elevated temperatures and pressure, this genuine Nissan seal is manufactured from premium-grade materials:

• Material: High-quality, oil- and heat-resistant elastomer (typically HNBR or specialized NBR) that withstands the chemical effects of hydraulic fluids and resists premature hardening.
• Design: Precision circular cross-section O-ring engineered to fit perfectly into the factory seat, preventing leakage through microscopic gaps.
• Fluid Resistance: Excellent resistance to ATF (Automatic Transmission Fluid) and specialized power steering fluids.

Function and Symptoms of Failure

The primary role of the inlet seal is to prevent air from entering the power steering system and to stop hydraulic fluid from leaking out. If the seal degrades, hardens, or cracks, the following issues may occur:

• Air Ingestion (Cavitation): The pump draws in air past the compromised seal, causing power steering fluid aeration and foaming in the reservoir.
• Abnormal Noise: Due to air entering the hydraulic circuit, the power steering pump produces a characteristic whining or groaning noise when turning.
• Stiff Steering: Aerated, foamy fluid fails to generate proper hydraulic pressure, which can result in increased steering effort.
• Fluid Leakage: Wetness or visible fluid residue around the power steering pump inlet suction pipe.

Replacing the O-ring is strongly recommended whenever the power steering pump is disassembled, the suction hose/connector is removed, or if any of the above symptoms are noticed, in order to prevent premature pump wear.