By Century Motors



Part # B847

Warranty 1 Year

Manufacturer Code B2847V1

Dimensions 12.5" L x 6.5" W x 6.5" D

Alternate Part #'s 0-177474-01, 1-168919-06, 10-168919-06, 10-177079-04, 1103655401, 1103655402, 135105, 15815, 164652, 164961, 165190, 165903, 168452, 168919, 177079, 177215, 177474, 190021, 193267, 193985, 35-5339, 35-5399, 355020S, 355021S, 355339, 5KC38SN6085AX, 5KC38SN6085X, 5U124, 5U159, 6-177079-40, 7-168452-04, 7-168452-84, 7-177079-04, 7-177474-01, 7-177474-61, 7-177474-81, 7-193985-04, 7-196335-24, 75233, 8-165903-20, 8-165903-21, 8-168452-04, 8-168452-20, 8-177079-04, 8-177079-40, 8-177474-01, 8-177474-10, A0104900, A100DH, A100DHL, B2847V1, B623, B847, C1305, C48K2EB102A2, EB847, ESQ1072, P712, S88-380, SP3207Z1BE, SQ107, SQ1072, SQD75FL1, V15815, 35-126-1202, B2847, CRMB2847V1

Product Description

Century Centurion replacement motor for Pentair WhisperFlo and Challenger full-rated pumps.

Shipping as Motor Model B2847V1

Specifications: HP = 3/4, RPM = 3450, Voltage = 115/230, Amps = 14.2/7.1, Service Factor = 1.65, Frame = 56Y, Shaft = Threaded. *Please Note: This is the correct replacement motor for the Challenger 3/4 HP full-rated pump.

Note: NOT California Title 20 Compliant. 

Dual Speed Options: (Not Compliant)

  • Dual Speed 115V - B2981
  • Dual Speed 230V - B2980

California Title 20 Compliant Option:

  • Variable Speed 230/115V - EVQ165
Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

0.75 HP
115/230 V
6.6/13.2 amp
Service Factor:
Total HP:
1.24 HP
Century (A.O. Smith)
3450 RPM
Commonly Used On:
Pentair WhisperFlo and Challenger

?     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

1 to 2 hrs

Tools Needed

Screwdriver, Nut Drivers, Pliers, Socket Set, Adjustable Wrench

Pool pump was failing...bearings were howling

Written on 9/1/2023 by Guest

Ordered replacement pump from Inyo Pools.
Received pump.
Unpackaged pump.
Found that the screw holding the plastic cover on the end of the pump had broken off at it's connection to the pump. Also a cast spacer at the end of the pump had broken off.
Appeared the package may have been dropped on it's end during shiipping resulting in this damage.
Although the screw had broken off right at it's entry into the cast piece of the pump, I was able to back out/remove the broken piece of screw.
This allowed me to know I would be able to attach the plastic cover to the pump, ie use the pump as received...
Renoved the old pump.
Installed the new pump utilizing the screw removed from the old pump in securing the new pump's plastic cover..
Being able to extract the small piece of screw from the new pump's cast end kept me from having to send the new pump back and wait for another to arrive.

Were these instructions helpful? 


Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Socket Set

Pump quit working due to age and wear and tear

Written on 7/2/2023 by Guest

I ordered this from INYO and was able to install in a few hours with help and the video on this site. Very helpful video and the pump works great. Great price, fast shipping, and great advice on install.

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Socket Set, Wrench Set

The Texas Freeze took out my pool pump!

Written on 6/7/2021 by Guest

It was easy to cross reference my old pump and find the perfect replacement match. INYO sent it out right away and I installed it easily. I like to watch their videos on replacing the pump and shaft seal first, as a refresher course, before I get started. Changing the pump and shaft seal is easy with their tutelage. Thank you INYO!

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Pliers, Socket Set, Wrench Set

1     0

Old pump died

Written on 7/2/2020 by Guest

Shut off power. Disconnected power from motor and removed existing motor with seal plate from pump housing. Removed diffuser and then removed impeller. Removed motor from seal plate. Replaced shaft seals on impeller and seal plate. Reattached seal plate followed by impeller and diffuser. Reattached new motor with seal plate to pump housing and connected electrical. Super easy job and even easier following inyo how-to-videos.

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Review Summary

 (Average 4.82  out of 5 stars)
16 Rating
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