National 711181 Engine Oil Pump Seal

Engine Oil Pump Seal for Honda and Acura Applications

National 711181 is an engine oil pump seal built for metric applications that require a precise sealing fit between the shaft and housing bore. It uses a fluoro-elastomer sealing material and a clockwise-spiral lip design to support consistent oil control in the engine oil pump area.

This seal measures 41.000 mm inside diameter, 56.130 mm outside diameter, and 7.000 mm width, with a housing bore of 56.000 mm. National 711181 is a direct-fit service part for many Honda and Acura engines, including Acura MDX, TL, RL, and Honda Odyssey, Pilot, and Ridgeline applications.

Key Features

• Engine oil pump seal for metric applications
• Fluoro-elastomer sealing material for oil resistance
• Clockwise-spiral lip design
• 41.000 mm shaft diameter and 56.000 mm housing bore specification
• 7.000 mm width for proper sealing depth
• National part number 711181

Detailed Description

National 711181 is an oil seal engineered for the engine oil pump sealing interface, where accurate dimensions and material selection matter. The fluoro-elastomer construction is suited to the heat and fluid exposure common in modern engine environments, while the spiral lip design helps maintain sealing contact during operation. This part number 711181 is listed for a wide range of Honda and Acura vehicles, including 2001-2019 Acura MDX, 1999-2019 Honda Odyssey, 2003-2019 Honda Pilot, and 2006-2014 Honda Ridgeline. This part cross-references Bosch 16149 for the same application.

What This Part Helps Address

• Oil seepage at the oil pump seal area
• Loss of sealing integrity from worn or hardened seal material
• Leak-related contamination around the front of the engine
• Service replacement needs on Honda and Acura oil pump assemblies
• Fitment-specific repair work on Acura MDX, TL, RL, and Honda Odyssey, Pilot, or Ridgeline engines

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation to confirm the correct metric fit. Clean the sealing surface and inspect the shaft for wear, scoring, or corrosion before installing National 711181. Use proper installation practices to avoid damaging the fluoro-elastomer lip and confirm the seal seats evenly in the housing.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing products for current vehicle platforms. The 711181 oil pump seal reflects that focus on dimensional accuracy and modern sealing materials for service applications.