Genuine BMW 11-31-1-439-551 Timing Chain Guide Rail Bolt

The Genuine BMW 11-31-1-439-551 is a precision-engineered timing chain guide rail bolt designed to secure the timing chain guide rails in BMW engines. This OEM fastener is a critical component in the engine's timing system, ensuring proper tensioning and positioning of the timing chain guide rails that direct the timing chain's movement.

Key Features:

• Genuine BMW OEM part manufactured to exact factory specifications
• Designed specifically for timing chain guide rail mounting applications
• Precision-machined for proper torque and clamping force
• Essential component during timing chain service and engine rebuilds
• Engineered to withstand high engine temperatures and stress loads

This bolt is commonly replaced during timing chain service procedures as it is subject to repeated thermal cycling and stress. Using genuine BMW fasteners ensures proper fit, torque specifications, and reliability in this critical engine timing application. BMW recommends replacing timing chain hardware with new OEM components during timing system service to maintain engine performance and longevity.

OEM Part Number: 11-31-1-439-551 (also referenced as 11311439551, 11.31.1.439.551)