TOYOTA 90109-06017 Timing Cover Bolt

The TOYOTA 90109-06017 genuine OEM timing cover bolt (BOLT DS) is a precision fastener engineered specifically for the secure, leak-free mounting of the engine timing cover. This component plays a crucial role in maintaining engine bay cleanliness and protecting the timing system.

Technical Features and Specifications

• Manufacturer: TOYOTA (Genuine OEM Part)
• Part Number: 90109-06017
• Part Name: Timing Cover Bolt (BOLT DS)
• Material: High-tensile hardened steel for maximum torque resistance
• Surface Treatment: Specialized anti-corrosion coating resistant to moisture and engine bay chemicals
• Design: Threaded shank with a flanged head for uniform pressure distribution

Function and Importance of the Timing Cover Bolt

The function of the timing cover bolt is to provide consistent and even clamping force onto the gasket positioned between the timing cover and the engine block. This prevents engine oil from escaping into the engine compartment and protects the timing mechanism against dust, dirt, and other external contaminants that could lead to premature wear or failure of the timing belt or chain.

Signs of Failure or Wear

• Oil Leaks: If the bolt stretches or loosens due to engine vibrations, engine oil may leak past the gasket.
• Mechanical Damage: Improper tightening torque can lead to stripped threads or sheared bolt heads.
• Corrosion: Oxidation can weaken the bolt's structure, creating a risk of breakage during servicing.

During maintenance procedures that require removing the timing cover, it is recommended to inspect the condition of the mounting bolts and replace them with new genuine parts as needed to ensure proper sealing and secure retention.