Dayco 71266 Engine Coolant Bypass Hose - Thermostat To Water Pump

Overview of Dayco Curved Radiator Hose 71266

The Dayco Curved Radiator Hose 71266 is designed for reliable engine coolant bypass in select BMW models. Engineered with durable EPDM material, this black single inside diameter hose ensures consistent performance in cooling systems for vehicles like the BMW 325i and 525i.

• Constructed from high-quality EPDM for heat and chemical resistance
• Black color with a curved design for precise fitment
• End 1 and End 2 inside diameter both measure 1 7/16 inches
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Single inside diameter hose type without heat shield or protective sleeve
• Trunk height of 13 inches for proper routing

Detailed Product Description

The Dayco Curved Radiator Hose 71266 is a specialized engine coolant bypass hose crafted from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and coolant chemicals. This hose features a consistent inside diameter of 1 7/16 inches on both ends, ensuring a secure and leak-free connection within the cooling system. Its black color and curved shape are designed to match the routing requirements of specific BMW models, including the 325e, 325es, 325i, 325is, 325iX, 525i, and 528e. The hose complies with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, confirming its suitability for automotive coolant applications. Notably, this hose does not include a heat shield or protective sleeve, which is typical for this type of bypass hose.

About the Curved Radiator Hose Product Line

Dayco's Curved Radiator Hose line focuses on providing hoses with precise bends and dimensions to fit specific vehicle cooling system layouts. This product line addresses the need for hoses that maintain coolant flow efficiency while fitting tightly within engine compartments. The 71266 part number is part of this line, offering a tailored solution for BMW models requiring a curved bypass hose with consistent inside diameters and durable EPDM construction.

Common Applications and Problem Solving

• Replacement of worn or cracked engine coolant bypass hoses in BMW 3 and 5 Series models
• Prevention of coolant leaks that can lead to engine overheating
• Restoration of proper coolant flow in the bypass circuit
• Addressing hose swelling or softening due to age or chemical exposure
• Ensuring compatibility with OEM cooling system specifications

Installation Notes and Tips

When installing the Dayco Curved Radiator Hose 71266, ensure the hose is routed according to the vehicle manufacturer’s specifications to avoid kinks or interference with other engine components. Verify that the inside diameter matches the connecting fittings on the BMW 325i or 525i models. Use appropriate clamps to secure the hose ends firmly, and inspect for any signs of wear or damage on adjacent parts during installation.

Quality Assurance and Warranty

Dayco manufactures the Curved Radiator Hose 71266 to meet stringent SAE standards, ensuring durability and performance in demanding automotive environments. While specific warranty details are not provided, Dayco products typically adhere to industry quality controls and are designed to meet or exceed OEM requirements for engine coolant hoses.