Corroded Pump Motor - Replace Bearings or Buy New?

Hey all,

I have a Pentair Whisperflo pump that’s been getting loud lately, so I bought some replacement bearings. When I took it apart, I found the motor is in really bad shape — the aluminium case is corroded, and the shaft is rusty. Now I’m wondering if it’s even worth replacing the bearings or buying a new motor. Bearings are only about $25, but a new pump would be $300. The motor’s condition makes me think the bearing replacement will be tough.

Would you replace the bearings or go for a new motor?

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You’re done once the bearings engage. A new motor is a better option for you. It will never be the same when the bearings are gone. You may avoid wasting time and energy on repairs and replacement parts by investing in a new 300cc motor. Bearings are the least of your problems because it is so rusted! Wishing you luck!

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Think about swapping it out for a Pentair Intelliflow or other variable-speed pump. Over time, you’ll save a ton of money on power, and the energy-efficient pump could be eligible for a refund from your state or utility.

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The worst issue with this is that taking off the lengthy thru bolts holding this motor together prohibits the plastic internal fan from using heat. 5/16 bolts Although I have used heat extensively throughout my life, the majority of parts—aside from bearings—are not readily accessible. If you’re lucky, two strong bolts will get you by, but they must be opposite upper and lower.

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@Sadie Whoa. When I disassembled it, I didn’t even realize that I had broken one of those through bolts until I read your post and then looked at it. Luckily, it broke off high enough so I can repair it and remove what’s left of it.

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It’s a typical predicament. New, and don’t worry about it for another five to ten years.