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  1. #1
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564

    k body oil pump cracked

    Went on a call for a warm 2 door reach in freezer. Found low charge. I had actually topped this thing up 6 months ago or so. At the time I found lots of oil around the k-body compressor so i tightened all the bolts etc.

    This time I decided to scrub everything down and try finding the leak again since tightening the bolts didn't work. I sprayed it down with simple green and noticed bubbles coming from a crack in the oil pump housing. The crack was in the middle of the part, it did not go to an edge. Never seen anything like this before.

    This is a 2 year old copeland factory rebuild that was installed by a competitor. I assume it was either a casting flaw or the compressor got dropped on the oil pump. I ordered a new pump housing.

    Anyone ever seen something like this before?

  2. #2
    Join Date
    Dec 2000
    Location
    Flat Rock, NC
    Posts
    463
    Possibly damaged from overpressure during defrost? Check for cpr leaking or wrong txv. Never seen that issue.

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,918
    I'd be more inclined to suspect a poor casting or impact damage as you thought.

    FYI, K bodies do not have oil pumps. They are 'slinger' lubricated. That is just a bearing housing and cover.

  4. #4
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564
    Quote Originally Posted by jpsmith1cm View Post
    FYI, K bodies do not have oil pumps.
    This one does
    heres the part I ordered

    http://www.bradparts.com/CartGenie/prod-3615.htm


    Its the first K I've seen with an oil pump.

  5. #5
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,478
    The 1.5 HP KAL & KAT models do in fact have a positive displacement oil pump.

    They don't need an oil failure control, so that may be the reason it goes unnoticed.

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,918

  7. #7
    Join Date
    May 2003
    Location
    Utah
    Posts
    742
    Quote Originally Posted by craig1 View Post
    This one does
    heres the part I ordered

    http://www.bradparts.com/CartGenie/prod-3615.htm


    Its the first K I've seen with an oil pump.
    Just curious....why would you not be ordering Copeland authorized parts rather than parts from a compressor rebuilder?

  8. #8
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,478
    I had an old KATB-015E at the shop, so I thought it would be educational to show some pics of the oil pump.

    Here's the pump end view. Note there's no access ports for checking oil pressure:



    This is a shot of the disassembled pump. You have to be gentle to get that dip tube out without breaking it off:


  9. #9
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564
    Quote Originally Posted by bunny View Post
    Just curious....why would you not be ordering Copeland authorized parts rather than parts from a compressor rebuilder?
    Bradley's sends me a Christmas card personally signed by every employee. Copeland sends me advertisements for expensive classes. Seriously though copeland won't sell me internal parts (rods, pistons) so I won't buy their external parts (oil pumps and valve plates).

  10. #10
    Join Date
    Sep 2011
    Location
    Plainfield IL
    Posts
    101
    Never seen that before. Good to know it could happen though. Chances are its a Copeland casting anyway so I find it hard to blame that on a rebuilder.

  11. #11
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564
    Quote Originally Posted by Fridge Repairer View Post
    Never seen that before. Good to know it could happen though. Chances are its a Copeland casting anyway so I find it hard to blame that on a rebuilder.
    I'm sure its a Copeland casting because this compressor was a copeland factory rebuild.

  12. #12
    Join Date
    May 2003
    Location
    Utah
    Posts
    742
    Quote Originally Posted by craig1 View Post
    Bradley's sends me a Christmas card personally signed by every employee. Copeland sends me advertisements for expensive classes. Seriously though copeland won't sell me internal parts (rods, pistons) so I won't buy their external parts (oil pumps and valve plates).
    I can see why a signed Christmas card might be more important than using original OEM parts from the company that designed the compressor.

    Why would one ever need to purchase rods and pistons for a semi-hermetic compressor? They really don't lend themselves to field repair of that magnitude.

    A Carrier 5H where you can replace the crankshaft, piston sleeves, etc....sure. But a somewhat accessible semi??? If the rods and/or pistons need replacing, the compressor needs replacing.

  13. #13
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564
    Quote Originally Posted by bunny View Post
    I can see why a signed Christmas card might be more important than using original OEM parts from the company that designed the compressor.

    Why would one ever need to purchase rods and pistons for a semi-hermetic compressor? They really don't lend themselves to field repair of that magnitude.
    The Christmas card part was a joke. They do send one, but its not the reason I don't buy copeland parts. However, when I have a choice I'd rather support a small business than some multinational corporatation.


    I repair lots of noisy compressors as preventative maintenance. Customers will spend some money for preventative repair now, but won't spend money to replace a noisy compressor until it breaks. Since I mostly work alone, they usually end up breaking on the hottest day of the year or when I'm on vacation. By repairing ahead of time I can prevent down time for a customer and save them money and lost product while saving me inconvenience.

    The compressors that I repair most often are the models without oil safeties. The refrigerant gets low and oil quits returning and they run dry with nothing to shut them down.

    Another benefit of repair is that it can be done quickly in the field if necessary. Working alone I can't pull a D series compressor and take it for exchange. But I can easily flip it on its side, pull the heads and base plate, and swap out the worn parts.

    I have never had a repeat failure.

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