NISSAN 31379-3AX0A Automatic Transmission Magnet

The genuine Nissan 31379-3AX0A automatic transmission magnet is a critical safety and maintenance component designed to protect the hydraulic system and internal structure of the automatic transmission. Located directly inside the transmission oil pan (sump), this specialized magnet captures and filters out metallic particles suspended in the lubricating fluid.

Operating Principle and Importance

During the operation of an automatic transmission, mechanical components (gears, bearings, shafts, and clutch plates) are subjected to continuous friction. This results in microscopic ferromagnetic wear debris (metal dust and fine shavings) entering the automatic transmission fluid (ATF). If these particles circulate freely through the system, they can cause the following issues:

• Sticking or premature wear of the precision valves and solenoids within the hydraulic valve body (mechatronics).
• Premature wear of gaskets and oil seals, leading to fluid leaks.
• Accelerated abrasive wear on bearings and gear sets.

Thanks to its high magnetic field strength, the genuine Nissan magnet effectively attracts and retains these metallic particles, keeping the hydraulic circuit clean between filter replacement intervals.

Technical Specifications

• Manufacturer: Nissan (Genuine OEM part)
• Part Number: 31379-3AX0A
• Application Area: Automatic transmission oil pan
• Material: High-temperature and ATF-resistant magnetic alloy
• Resistance: Retains its magnetic properties even under extreme operating temperatures and continuous vibration

Maintenance Recommendations and Symptoms of Failure

The condition of the magnet should be inspected during every transmission fluid and filter change. During routine service, metallic sludge adhering to the magnet must be cleaned off, or the magnet must be replaced if it has become saturated, physically damaged, or has lost its magnetic charge.

Symptoms resulting from a malfunctioning or saturated magnet include:

• Harsh, jerky gear shifts caused by contamination in the valve body.
• Delayed gear engagement.
• Increased mechanical noise from the transmission.