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  1. #1
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63

    Two YTJ-67 Compressors

    I have two YT chillers used with R-11 refrigerant,
    they were initially started up twenty six years ago,
    for the past 7 years, they have been left unused, and now the customer wants to reuse them for their supermarket air conditioning,
    I just had the compressors(YTJ-67) disassembled,
    both compressors' bearings and seals(Balance piston and eye seals) have some scrtches and scuff marks on the inner surface, and on the outward surface, there seem to be corrosions that I suspect it was caused by moistures in the refrigerant system and no lubrication(as I mentioned these two chillers have been put idle for 7years),
    My questions are:
    1. are these bearings still useable?
    2. what is the life span for Aluminum Alloy bearings used in York centrifugal compressor?
    Any advice will be much appreciated.
    Attached Images Attached Images

  2. #2
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63
    Some more pictures of chiller A,
    Attached Images Attached Images

  3. #3
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,527
    who cares if they are still usable? it is already open, replace them especially if they are questionable.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  4. #4
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,506
    clean them up and mic them and see if they are in specs.

  5. #5
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    Hard to tell the condition from a picture in this case.

    Did you ever figure out why that YK was losing oil and then getting it back at shutdown?

  6. #6
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    1. I think as stated earlier what are the spec readings ?
    2. Is the customer ok with using these parts if so failure could happen sooner than later ?
    3. If it was your machine what would you do ?
    4. Aluminum bearings should last for quite some time if properly lubricated and not exposed to atmospheric conditions for any lenght of time.
    5. What does the rest of the machine look like ?
    6. Clean up kit if you do decide to reassemble should be installed.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
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  7. #7
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63
    Gentlemen,
    Thanks for your reply,
    I apologize for my short of knowledge of Aluminum material,
    can anybody here kindly inform me more about the spectrum?
    what is the test and what fact can it clarify?
    actually I have suggested my customer to replace all the bearings as none of us dare to take risk of possible failure,
    because the price of two sets of bearings is as high as about $65,000,
    and my customer don't have any extra budget for the expense this account year,
    so they incline to reuse those bearings if they are still usable or can last for at least six months,
    when I opened these two compressors, they looked terrible,
    rust and dirt are everywhere inside the machine,
    it has took me one week to clean them and the job is still ongoing now,
    if the spectrum can clarufy the condition of bearings, then I would think of doing it first.
    again, thanks for your opinions to this matter.

  8. #8
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63
    Quote Originally Posted by freonrick View Post
    clean them up and mic them and see if they are in specs.
    Sir,
    could you provide the detailed information of the test for aluminum bearings?
    thanks in advance.

    Tung

  9. #9
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    This is getting way too detailed for an open forum.

  10. #10
    Join Date
    Jan 2011
    Posts
    1,223
    Agreed. I should have never said those things. MODERATOR: Can you delete my post #9? Taicool, you need to apply for Pro Status. Technical discussions need to happen there, not out here in public.

  11. #11
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,506
    I think a chiller tech needs to be involved hands on so they can see the whole thing. something can be misinterpreted when we cant see what you have as a whole. too much money involved for a mistake.

  12. #12
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63
    Ok, there were some mistakes here,
    I have no idea of what the abbreviations mic and specs stand for,
    I thought them as some kind of test that has to be carried out by professional people with special instruments,
    although I have no way to access the professional forum because I don't have any american official certificates,
    as to the manual 160.45 M1.1, yes I do have a pdf copy,
    thanks a lot for the advice, that is felpful.

    Tung

  13. #13
    Join Date
    Jan 2011
    Posts
    1,223
    Mic stands for measure with a micrometer, but if you don't know what the measurements then that endeavor is useless.

    Spec stands for the "specification"...in other words, the exact dimensions of the bearing and it's tolerances.

    Quote Originally Posted by Taicool
    although I have no way to access the professional forum because I don't have any american official certificates
    I don't know that you need any American certificates to apply for Pro status. If you list your qualifications, how long you've been in the trade, who you've worked for and other details about your professional background you should be considered for pro status. I had the impression you may have worked for York or Johnson Controls at one time.

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