NISSAN 31377-41X60 Transmission Oil Pan Retaining Bolt

This genuine NISSAN transmission oil pan retaining bolt (part number: 31377-41X60) is a premium-quality, original factory replacement part specifically engineered for the secure and leak-free mounting of the transmission oil pan. The retaining bolt ensures proper and uniform clamping force on the gasket between the oil pan and the transmission housing, preventing critical lubricant leaks.

Function and Importance

The transmission oil pan stores the transmission fluid required for lubrication and hydraulic operation of the gearbox. The mounting bolts are designed to withstand vibration, temperature fluctuations, and mechanical stress. The use of inferior or damaged bolts can lead to a loss of sealing integrity, causing fluid leaks, transmission overheating, and severe internal damage.

Common Symptoms of Failure or Wear

• Thread damage or elongation: Overtightening (often caused by not using a proper torque wrench) can stretch or strip the threads.
• Corrosion: Due to its location underneath the chassis, the bolt is exposed to moisture and road salt, leading to rust and material degradation.
• Oil leakage: If the bolt loosens or loses its clamping torque, fluid may leak past the oil pan gasket.
• Damaged bolt head: Using incorrect tools during previous service work can round the bolt head, making subsequent removal or tightening difficult.

Technical Specifications

• Manufacturer: NISSAN (Genuine OEM part)
• Part Number: 31377-41X60
• Part Type: Transmission Oil Pan Retaining Bolt
• Material: High-tensile, heat-treated steel alloy for maximum durability
• Surface Treatment: Specialized corrosion-resistant coating for environmental protection
• Installation Note: Always observe the manufacturer-specified tightening torque during installation to protect threads and ensure gasket integrity.