Fuel pump gears are critical to fuel delivery, constantly subjected to rotational torque, high-frequency vibration, and exposure to fuel and oil. While the gear must be secured against slippage (which would halt fuel delivery), the pump assembly often requires service or disassembly for seal, diaphragm, or internal component replacement. This demands a retaining compound that offers structural holding power combined with easier removability.
The optimal solution is a retaining compound engineered for structural holding power while offering the lowest strength for serviceability.
INCURE WeldLock™ 338 Retaining Compound (Yellow)
The INCURE WeldLock™ 338 Retaining Compound is the functional “Medium Strength” solution. It is designed for press or slip-fit applications where future disassembly is required, providing sufficient torque resistance to prevent gear spin-out without making future pump maintenance a destructive process.
| Key Feature | Performance for Fuel Pump Gear Mounts |
| Serviceable Bond (Yellow) | Specifically designed for assemblies requiring removal or repositioning. Locks the gear securely but allows for non-destructive separation when the pump requires internal service. |
| Excellent Vibration Resistance | Provides reliable holding power against continuous engine vibration and pump operation, preventing the gear from shifting or walking off the shaft. |
| Gap Fill (Up to 0.25mm) | Effectively fills the annular space between the gear bore and the shaft, eliminating play that could lead to wear and failure. |
| Temperature Resistance (150∘C) | Maintains integrity under the heat generated by the engine and the pump’s operation. |
Application Steps: Installing Fuel Pump Gears
For optimal performance and reliable retention of the fuel pump gear, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean the shaft surface and the gear bore. Surfaces must be free of all fuel, oil, and old compound residue. Use an industrial cleaner or solvent (e.g., acetone) and wipe dry.
- Activate (If Needed): If using passive metals (like stainless steel) or if the ambient temperature is below 15∘C(59∘F), apply a chemical activator to the bond surfaces and allow it to flash off completely.
2. Product Application
- Apply: Apply a continuous, thin bead of WeldLock™ 338 around the full circumference of either the shaft or the internal bore of the gear.
- Ensure Coverage: For optimal retention and sealing, ensure the adhesive completely wets the entire mating surface as the components slide together.
3. Assembly and Curing
- Assemble: Immediately slide or press the gear onto the shaft. Ensure the components are aligned correctly before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after assembly.
- Cure: Allow the assembly to fixture before handling (typically 10-30 minutes). Allow a full 24 hours for the compound to reach maximum strength before placing the fuel pump into service.