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.
Some more pictures of chiller A,
who cares if they are still usable? it is already open, replace them especially if they are questionable.
Someday, I hope to be just as brave as Harry Stamper.
clean them up and mic them and see if they are in specs.
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?
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.
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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.
Originally Posted by freonrick
could you provide the detailed information of the test for aluminum bearings?
thanks in advance.
This is getting way too detailed for an open forum.
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.
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.
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.
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.
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.
Originally Posted by Taicool