Securing clutch plates (discs) to flywheels is an extremely high-load, high-heat, and high-vibration application. This joint is subjected to massive cyclical torsional forces (from engine pulses and engagement), high axial clamping loads, and intense heat generated during clutch slip and engagement. While the friction material does the primary work, retaining compounds are often used on the bolt threads and/or the register fit to ensure the absolute rigidity of the assembly, preventing micro-shift and bolt loosening, which can lead to clutch chatter and failure.
Note: For the retention of components like clutch pressure plates or the primary friction plate assembly to the flywheel (often using bolts and a precision register), a high-strength retaining compound is sometimes used on the register fit to prevent fretting corrosion. Since the primary retention is by bolts, the function of the compound is to eliminate radial play and enhance bolt security. However, since the primary need for this critical bolted assembly is often threadlocking (on the bolt threads themselves, often with high-strength red threadlocker), and for register retention, the highest strength retaining compound is selected.
INCURE WeldLock™ 365 Retaining Compound
For securing the clutch assembly register to the flywheel—where maximum shear strength, high-temperature resistance, and torsional stability are paramount—the WeldLock™ 365 provides the highest structural integrity. Its superior strength ensures the plate assembly cannot shift radially on the flywheel register, maintaining concentricity and preventing fretting damage.
| Feature & Benefit | Technical Insight for Clutch Plate Assemblies | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to cyclical torsional shock and high radial load. | Zero Fretting: Eliminates all micro-movement between the register and the flywheel, preventing wear and clutch chatter. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C (392∘F), essential for components that generate intense heat during operation. | End the Heat Threat: Guarantees the bond remains rigid and strong under maximum clutch thermal load. |
| Fills Close Clearance Gaps | Ideal for the precision register fit (less than 0.05 mmdiametral clearance) of clutch pressure plate assemblies. | Maximizes Contact: Converts the fit into an integrated component, optimizing concentricity and balance. |
| Oil Immunity | Inert to gearbox oil and assembly lubricants, ensuring the integrity of the joint is protected within the bell housing environment. | Reliability Assured: The bond remains permanently intact throughout the clutch lifespan. |
Application Steps: Locking Clutch Plates for Maximum Drivetrain Stability
Preparation (Critical): Thoroughly clean both the clutch pressure plate register bore and the flywheel mating surface/register. Remove all oil, grease, and residue. Use a degreasing solvent (like acetone or brake cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the flywheel register. Ensure the compound completely covers the mating area.
Assembly: Mount the clutch plate (if applicable) and pressure plate assembly onto the flywheel, ensuring the bolt holes and register align. Install the clutch bolts and torque them to the manufacturer’s specified pattern and valueimmediately. Note: High-strength red threadlocker is typically used on the bolts themselves.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before continuing assembly (installing the transmission) or operating the engine.
Stop risking fretting corrosion and micro-shift, and ensure your clutch assembly is absolutely rigid and reliable.