Thread-locking compounds are essential for preventing fastener failure due to engine vibration. Selecting the correct grade of compound is critical for both component security and future serviceability.

Medium-Strength Thread-Locker (Blue)#

Medium-strength thread-locker is designed for fasteners that require periodic removal but must remain secure under vibration. It provides a reliable bond that can be broken using standard hand tools without damaging the fastener or the surrounding assembly.

Tip

Use medium-strength thread-locker on components prone to vibration-induced loosening, such as Throttle Position Sensor (TPS) mounting screws or accessory bracket bolts.

High-Strength Thread-Locker (Red)#

High-strength thread-locker is intended for permanent assemblies. Once cured, the bond is significantly stronger and typically requires the application of localized heat (typically above 500°F / 260°C) to soften the compound before the fastener can be removed.

Warning

Do not use high-strength thread-locker on small fasteners or components that may require future adjustment or removal, as the force required to break the bond may result in sheared bolt heads or stripped threads.

Application Guidelines#

To ensure the effectiveness of thread-locking compounds, follow these best practices:

• Surface Preparation: Ensure threads are clean, dry, and free of oil, grease, or old thread-locker residue. Use a degreaser or brake cleaner if necessary.
• Application: Apply a small amount of compound to the leading threads of the bolt. The compound will distribute itself as the bolt is threaded into the hole.
• Curing: Allow sufficient time for the compound to cure according to the manufacturer's specifications before subjecting the assembly to engine vibration or thermal cycling.
• Torque: Always torque fasteners to the manufacturer's specified values. Thread-locker is a supplement to, not a replacement for, proper torque specifications.