Securing rudder bearings (both inner races onto the stock and outer races into the hull/rudder trunk) is a crucial application in marine engineering, vital for safe steering and vessel stability. This joint is subjected to massive cyclical side loads and axial thrust (from steering forces), constant vibration, and relentless exposure to saltwater or other harsh marine environments. Maintaining a rigid, zero-clearance fit is non-negotiable to prevent bearing walk, fretting corrosion, and structural damage to the rudder assembly or hull.
INCURE WeldLock™ 356 Retaining Compound (Metallic Grey)
Rudder systems, especially in larger vessels or those undergoing maintenance, often present unavoidable clearance gaps due to wear or tolerance differences. While WeldLock™ 365 is highest strength for precision fits, the WeldLock™ 356is superior here because it combines high strength with a crucial ability to fill larger gaps (up to 0.25 mm diametral clearance). The metallic fillers in the 356 ensure maximum contact and retention across slightly imperfect bores, creating a rigid, high-load bond that distributes stress across the entire circumference.
| Feature & Benefit | Technical Insight for Rudder Bearing Assemblies | Conversion Value |
| Gap Filling Capability | Formulated with metallic fillers to seal and bond clearances up to 0.25 mm, compensating for bore wear and tolerance stack-up. | Repair & Retain: Achieves high retention strength even on slightly worn or oversized bores. |
| High Shear Strength | Provides high structural strength, resisting axial pull-outand radial shift under massive steering and wave impact loads. | Lock Out Movement: Prevents bearing walk-out or spin, preserving the integrity of the rudder trunk. |
| High Temperature Resistance | Withstands operational temperatures up to 200∘C (392∘F), essential for joints that generate friction heat under heavy loads. | End the Heat Threat: Guarantees the joint won’t fail or soften during continuous heavy use. |
| Marine Immunity | Inert to saltwater, marine grease, and common antifouling compounds, protecting the joint in the harsh marine environment. | Structural Durability: Reduces shock fatigue and wear on the entire steering system. |
Application Steps: Locking Rudder Bearings for Maximum Steering Reliability
Preparation (Critical): Thoroughly clean both the bearing race mating surface and the rudder stock/trunk bore. Remove all grease, dirt, rust, and moisture. Use a powerful degreasing solvent (like acetone or industrial cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 356 evenly around the bearing outer race or the inside circumference of the rudder trunk bore. Ensure the compound completely covers the entire mating area.
Assembly: Press the bearing race into position using the manufacturer’s specified tools. Ensure the component is fully seated. Wipe away any excess compound immediately.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before applying load or operating the steering system. This is critical for maximum structural integrity.
Stop risking bearing failure and ensure your rudder system provides safe, reliable steering.