By Century Motors
Part # 5144-010
Manufacturer Code B116
Century® (A.O. Smith) 4.0 HP Uprated Motor – B116
Round Flange | Y56Y Frame | Single Speed
Key Benefits
✅ OEM Replacement — Genuine Century® motor designed for high-horsepower pool & spa pumps
✅ Powerful Performance — 4.0 HP uprated motor delivers strong water flow for demanding systems
✅ Durable Build — Ball bearings, stainless-steel shaft, and thermal overload protection extend lifespan
✅ Direct Fit — Round flange, Y56Y frame ensures proper fit with compatible pumps
Why Choose the Century® B116?
✅ Restores pump efficiency and performance in heavy-duty pool & spa applications
✅ Built with reliable A.O. Smith engineering for long service life
✅ Single-speed design for consistent, dependable output
Tech Tips
⚠️ Replace the pump shaft seal whenever installing a new motor to prevent leaks
✅ Verify wiring voltage before hookup (motor supports both 230V/115V depending on configuration)
⚠️ Use proper bonding/grounding to comply with electrical codes
✅ Mount motor securely on flat surface to reduce vibration and noise
Compatibility
✅ Designed for pumps requiring a 4.0 HP uprated, round flange, Y56Y frame motor
❌ Not compatible with square flange pumps (use the correct model for 56Y square flange frames)
Specifications
✅ Model: B116
✅ Horsepower: 4.0 HP (Uprated)
✅ Frame: Y56Y (Round Flange)
✅ Speed: Single Speed, 3450 RPM
✅ Voltage: 230V (check motor label for exact wiring requirements)
✅ Enclosure: Open Drip Proof (ODP)
✅ Rotation: CCWPE (Counter-Clockwise Pump End)
What’s Included
✅ Century® B116 Motor (4.0 HP, Uprated)
❌ Pump seal (sold separately, required for installation)
❌ Pump housing (reuse existing pump body)
⚠️ Note: This is a high-horsepower motor. Ensure your pump, plumbing, and electrical service are properly rated for 4.0 HP operation.
Not California Title 20 compliant.
What is Service Factor?
Reply
Service Factor(SF) is a multiplier that when multiplied by the horsepower of the motor indicates the total permissible horsepower loading that may be carried when the motor is operating at rated voltage and frequency. The most important thing to remember when replacing a motor is that the replacement motor's horsepower times its service factor must be equal to or greater than the original motor's horsepower times its service factor. The Service Factor rating can be found on the motor label. See Step 4 of our How to Read a Pool Motor Label guide.
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