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  1. #1
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    Stripped thread repair on condenser pump

    Hey guys, looking for some ideas.
    I've got a 40HP Taco condenser pump that has stripped threads for the rear cover. The motor sits vertical so the owner wants it repaired. It looks like the 2 bolts (1/4-20) were loose and just wore out the aluminum.
    Here's the killer, they are not blind holes and go into the bearing cavity. I'd like to go to a 8mm 1.25 pitch so I shouldn't have to drill. I'm worried about getting material into the bearing cavity. I'll use grease on the tap and clear it often.
    I was also thinking about filling the cavity full of grease and pump some more in pushing whatever is in it back through the holes.
    The cover itself will be easy to open up for the larger bolt.
    Any other ideas? I really don't want to diassemble the motor to do this...

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  2. #2
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    How bout helicoils in the existing holes? I never seen an aluminum made Taco, whats the series? FE FM FI ??
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  3. #3
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    Thread Starter
    The rear bearing cover of the motor is aluminum. It's a Baldor motor if memory serves me right.
    I'm leaning on ruling out Helicoils due to the fact that there may be 3/16 of material at most.
    Not sure on the series. I'll be back tomorrow for pump, strainer and chiller PMs. Got the tower cleaned today.
    Edit: Sorry, meant to quote your post. Also, don't you have to break off the tab after installing it? How would I keep it out of the bearing cavity?
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  4. #4
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    Its AL, so lubrication should not be much of an issue, high carbon tool steel is way stronger then cast AL.

    Id prolly just have someone hold a vacuum next to the tap, and do it dry.




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  5. #5
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    Thread Starter
    Quote Originally Posted by heatingman View Post
    Its AL, so lubrication should not be much of an issue, high carbon tool steel is way stronger then cast AL.

    Id prolly just have someone hold a vacuum next to the tap, and do it dry.




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    I've had billet aluminum gall without proper lubrication. I don't think there should be a problem with cast. I picked 8mm bolts because the ID is just over the OD of a 1/4-20 bolt. That way I just need to tap.

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  6. #6
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    Is the rear bearing cover on the Baldor motor? Not the pump? Pics?
    The 2nd most important amendment is to protect the 1st...

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  7. #7
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    Thread Starter
    Quote Originally Posted by R123 View Post
    Is the rear bearing cover on the Baldor motor? Not the pump? Pics?
    Sorry, didn't think of getting pics at the time. Yes, it's the motor that needs repair. Just Googled it. It's a Taco TS series pump. It's the splash guard on top. It bolt to the motor right near the bearing.
    Edit: Sorry, it's a KS
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  8. #8
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    Thread Starter
    I'll mull it over tonight. Almost time to hit the hay. I'll check back in the morning. I'll take some pics of the repair.

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  9. #9
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    Maybe a touch of antiseize on the tap, and call it a day.


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  10. #10
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    It’s just two bolts that hold the splash guard on the motor, nothing else “structural”?

  11. #11
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    Quote Originally Posted by BennyD View Post
    Sorry, didn't think of getting pics at the time. Yes, it's the motor that needs repair. Just Googled it. It's a Taco TS series pump. It's the splash guard on top. It bolt to the motor right near the bearing.
    Edit: Sorry, it's a KS
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    If thread repair doesn't work out how about making two, three or four thin flat bars with a 90° tab on one end & strap them to the side of the motor via a couple of large worm drive (hose) clamps.
    Then mount the water gard to these bars.

    It won't look as clean but perhaps it will be robust enough to do the job???


    (Tape each bar to the motor one at a time to temporarily attach with proper alignment before clamping all permanently).
    Eric

  12. #12
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    Thread Starter
    Quote Originally Posted by 71CHOPS View Post
    It’s just two bolts that hold the splash guard on the motor, nothing else “structural”?
    Correct

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  13. #13
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    Thread Starter
    Well, the owner is a bit leery of tapping the holes. Looking at it more (I promise to send pics), I may make a couple small brackets that will bolt to the studs that hold the motor together. They will have 2 opposing bends like a "Z" channel. There is enough stud to put that over and put a nut on it. I'll drill the cover to bolt the bracket to it.
    The center has 4 bosses in the bottom, 2 with bolt holes for the cover. I'll rotate the cover 90° so the other 2 will cover the holes to the bearing.

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