National 1172 Engine Crankshaft Seal - Front

Overview of National Engine Crankshaft Seal 1172

The National 1172 engine crankshaft seal is designed to provide reliable sealing performance for various Jeep and Volvo models. Engineered with silicone sealing material and a clockwise-spiral lip design, this oil seal ensures effective protection against oil leaks and contaminants.

• Inside diameter: 1.378 inches (35.000 mm)
• Outside diameter: 1.866 inches (47.400 mm)
• Thickness: 0.276 inches (7.000 mm)
• Sealing material: Silicone for durability and heat resistance
• Helix type: Clockwise-spiral lip design for enhanced sealing
• Compatible housing bore: 1.850 inches (47.000 mm)

Technical Details and Specifications

The National 1172 crankshaft seal is part of the 1000 series and constructed from high-quality silicone material, which offers excellent resistance to heat, oil, and wear. The seal features a 32-type design with a width of 0.276 inches, optimized for maintaining a tight seal around the crankshaft. Its clockwise-spiral lip design helps to prevent oil leakage by directing contaminants away from the sealing surface. This seal fits shafts with a diameter of 1.378 inches and is suitable for housing bores measuring 1.850 inches, making it compatible with a range of Jeep and Volvo vehicles.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with multiple Jeep and Volvo models, including Jeep Cherokee, Comanche, and Wagoneer, as well as Volvo models such as 240, 740, 745, 760, 780, 850, 940, 960, C30, C70, DL, GLE, S40, S60, S60 Cross Country, S70, S80, S90, V40, V50, V60, V60 Cross Country, V70, V90, XC60, XC70, and XC90. The National 1172 seal is designed to meet the specific sealing requirements of these vehicles’ engine crankshafts.

Common Issues Addressed by the National 1172 Seal

• Prevents oil leaks around the crankshaft area
• Protects engine components from dirt and debris intrusion
• Reduces risk of premature seal wear due to heat and friction
• Maintains engine oil pressure by ensuring a tight seal
• Helps avoid costly engine repairs related to seal failure

Installation Notes and Tips

When installing the National 1172 crankshaft seal, ensure the sealing surface and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the lip. Verify the seal orientation matches the clockwise-spiral lip design for optimal performance. Lubricate the seal lip lightly with engine oil before installation to reduce initial wear. Follow vehicle-specific service manual instructions for torque specifications and installation procedures.

Quality Assurance and Warranty

National engine crankshaft seals are manufactured to meet industry standards for durability and performance. The silicone material and precision design contribute to long service life under normal operating conditions. This product is backed by National’s quality assurance processes, ensuring consistent fit and function. Warranty coverage details should be confirmed based on the point of purchase and applicable manufacturer policies.