By Century Motors



Part # B842

Warranty 1 Year

Manufacturer Code B2842

Dimensions 14" L x 8.5" W x 6.5" D

Alternate Part #'s 0-177451-03, 10-165200-06, 10-177451-03, 1203185402, 16360, 165200, 165889, 168787, 177118, 177451, 186469, 186470, 193994, 196234, 1K054, 35-5393, 355012S, 355013S, 355393, 5KCR48UN2493X, 5U135, 7-165200-06, 7-168787-07, 7-177451-03, 7-177451-63, 7-193994-06, 71315, 8-165200-03, 8-165200-06, 8-165200-40, 8-177451-03, 8-186469-01, 8-186470-40, 90106931, AE100FH, AE100FHL, ASB842, B2842, B842, B842A, C1307, EB842, K48M2P104A1, K63CXDFV-5158, K63CXESE-4792, SQ1152, SQ215E, SQD15FL1E, CRMB2842

Product Description

Century Centurion replacement motors for Pentair WhisperFlo, energy efficient, full rated pumps. Specifications: HP = 1.5, RPM = 3450, Voltage = 208-230, Amps = 9.6-8.8, Service Factor = 1.47, Frame = 56Y, Shaft = Threaded.

Note: NOT California Title 20 Compliant. 

Dual Speed Option: (Not Compliant)

California Title 20 Compliant Option:

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

1.5 HP
208-230 V
9.6-8.8 amp
Service Factor:
Total HP:
2.21 HP
Century (A.O. Smith)
3450 RPM
Commonly Used On:
Pentair WhisperFlo

?     Asked on 1/11/2012by Guest

What is Service Factor?

A  Answered on 1/11/2012 by InyoPools Product Specialist Patrick P.

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.

?     Asked on 1/12/2012by Guest

Why do I need to purchase a new shaft seal?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

We strongly recommend replacing the shaft seal. The purpose of a shaft seal is to prevent water from running down the shaft of the motor and into the motor housing. Water will damage the bearings and cause the motor to fail. A new shaft seal should be installed whenever a motor is replaced. The motor manufacturer can deny the warranty if the motor fails to due to water damage from a faulty shaft seal. To find your shaft seal you will need to visit our Pool Pump Parts Page or the Spa Pump Parts Page and select your make and model.

?     Asked on 1/12/2012by Guest

Why should I purchase a Tune Up Kit?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

A Tune Up Kit includes all of the essential replacement seals and gaskets for the pump. The seals and gaskets should be replaced when installing a new motor on your pump. New seals will prevent the pump from leaking water or losing the prime. A Tune Up Kit will protect your motor and ensure that the pump is working efficiently.

?     Asked on 1/19/2012by Guest

I'm trying to replace the motor on my pool pump but all these numbers and abbreviations on the motor label are really confusing me. What do they mean?

A  Answered on 1/19/2012 by InyoPools Product Specialist Patrick P.

Replacing a pool pump motor is not as difficult as it seems. You can try looking here. If you need help figuring out what the information on your label means. If you are still having difficulty figuring it out you can call us at our toll free number or you can send us a photo of your motor label here.

?     Asked on 2/16/2012by Guest

I just finished replacing the shaft seal on my booster pump. As soon as I turned the pump on water was leaking from the shaft seal. Is it defective or am I doing something wrong?

A  Answered on 2/16/2012 by InyoPools Product Specialist Patrick P.

Depending on the model, the installation of a booster pump shaft seal can be slightly different than a pool pump shaft seal. Some booster pump and pool pump shaft seals require that a silicone sealant be used on the outer areas of the metal seat of the shaft seal. The seal will need to be lightly hammered into the body of the pump. You can use a 1 inch PVC coupling or a piece of 1 1/4 inch PVC pipe and a rubber mallet. This procedure will apply to any pool pump or booster pump using a >PS-1000 style shaft seal.


Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Nut Drivers, Socket Set, Adjustable Wrench

Motor bearings wore out

Written on 6/26/2022 by Guest

Separated pump and motor housing. Swamped motor and installed new seal kit

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Nut Drivers, Pliers, Socket Set

2     0

Original motor burnt up!

Written on 10/4/2019 by Guest

Disconnect power/ground/removed 8 bolts that hold flange to pump/took picts of wiring/removed wires/removed motor from flange/removed impeller/replaced seal-gasket/rewired new motor to harness/silicone on flange gasket/replaced bolts/power/done

Were these instructions helpful? 


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Pliers, Socket Set, Wrench Set

4     0

Screeching Pump Motor

Written on 7/13/2017 by Guest

A couple of weeks ago the motor on our Whisperflo (model WFE-6 ) began squeeling loudly. I've heard the sound before on other motors and I knew that this one was done for. After a web search for the exact motor (AO Smith B2842) as shown on the motor info label I purchased one from INYOPools.com. I also bought the "Saltwater Tune Up Kit Pentair/Purex Whisperflo" which includes gaskets and lubricant for my model.

Steps for replacement
1. Ensure the breaker that powers the old motor has been turned off.
2. Close valves to stop incoming pool water from entering the pump.
3. Set the filter valve to the backwash or rinse setting.
4. Remove 6 bolts and 2 nuts (9/16" socket & Wrench) from the pump assembly and gently rock the motor to disconnect it and the collar from the pump assembly.
5. Use a hex wrench to remove the two small bolts from the impeller cover. The cover should come off easily.
6. Use a phillips head screwdriver to remove the "REVERSE THREADED" screw in the center of the impeller. It's REVERSE THREADED so a clockwise direction is used to take it out.
7. Use a flat head screwdriver to remove to screw on the cover that protects the back of the motor. Remove the cover.
8. Unscrew the impeller (normal thread so counter-clockwise) from the shaft of the motor. You can use the 9/16" open ended wrench to stabilize the motor shaft on the rear so that doesn't turn while removing the impeller.
9. Use 9/16" socket to remove the 4 bolts holding the motor housing to the pump collar remove the collar from the motor.
10. Take a picture of the wiring on the back of the motor to assist when putting it all back together.
11. Use a screwdriver to loosen the retaining screws and disconnect the wires and ground from the back of the motor.
12. Remove wires and protective conduit from the old motor.
13. Move conduit to the new motor, run wires through the conduit, and connect wiring as shown in picture from step 10 above. (Don't forget the grounding wire that should go directly to the ground near the pump.
14. Remove and replace metal backed seal (included in gasket kit) from the pump collar.
15. Remove and replace ceramic/rubber seal (included in gasket kit) from the impeller.
16. Lubricate and replace round and collar shaped gaskets on the collar and impeller cover.
17. Reverse steps to reinstall the collar, impeller, cover, etc. Tighten all.
18. Power on.

Were these instructions helpful? 


Review Summary

 (Average 4.66  out of 5 stars)
26 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Helpful Review

The Most Recent Reviews