Dorman 911-979 Secondary Air Injection Check Valve

Overview of Dorman Secondary Air Injection Check Valve

The Dorman 911-979 Secondary Air Injection Check Valve is engineered for reliable emission control in select BMW models. Designed with durable cast aluminum and a reed valve mechanism, this component supports efficient air injection system operation under varying conditions.

• Constructed from cast aluminum for strength and corrosion resistance
• Gray finish complements OEM appearance
• Inlet and outlet size of 0.83 inches for precise fitment
• Maximum pressure rating of 50 psi to handle system demands
• Reed valve type ensures proper airflow direction
• Operates effectively within a temperature range of -40°C to 125°C
• Includes one secondary air injection control valve and one gasket for installation

Detailed Product Description

The Dorman 911-979 secondary air injection check valve is specifically designed for BMW vehicles including the 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, and X3 models. Its cast aluminum construction provides durability and resistance to heat and corrosion, essential for maintaining emission control system integrity. The reed valve design allows for one-way airflow, preventing exhaust gases from flowing back into the air injection system. Both the inlet and outlet ports measure 0.83 inches, ensuring compatibility with factory air injection hoses. Rated for pressures up to 50 psi, this valve performs reliably under typical operating conditions. The included gasket facilitates a secure, leak-free installation.

Applications and Problem Resolution

• Prevents exhaust gas backflow that can damage the air injection system
• Helps maintain proper secondary air injection for emission control compliance
• Addresses check valve failure symptoms such as rough idle or failed emissions tests
• Reduces risk of air injection system leaks and related engine performance issues
• Supports consistent operation in cold and hot temperature extremes

Installation Notes and Tips

When installing the Dorman 911-979 check valve on compatible BMW 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, and X3 models, ensure the gasket is properly seated to prevent leaks. Verify that the valve orientation matches airflow direction as indicated by the reed valve design. Inspect connecting hoses for wear or damage and replace if necessary to maintain system integrity. Installation should be performed with the engine cool and following manufacturer torque specifications.

Quality Assurance and Warranty

Dorman manufactures this secondary air injection check valve to meet or exceed OEM standards for fit, form, and function. The cast aluminum material and reed valve design contribute to long service life under normal operating conditions. This part is backed by Dorman's limited warranty, providing coverage against defects in material and workmanship for a specified period. Refer to Dorman's warranty documentation for complete details.