About a week ago I heard a faint chirp coming from under the hood......now it has developed into a very loud chirp (like a cricket) coming from the A/C compressor, and it stops when the compressor is off. Can you replace the compressor bearing or does the whole thing have to be replaced?
A/C compressor question
- Thread starter Kazuma Cruiser
- Start date
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i think you could. i've seen the page from the FSM where you can disassemble the A/C compressor and replace the bearing
Well, if it chirps only when the A/C is on, then it's not the bearing; the bearing is turning any time the engine is on. If the bearing was bad, you'd hear noise all the time. With the A/C on, spray some WD40 or something on the belt, and see if the noise goes away. If it does, consider replacing the belt.
When and how does it chirp?
A constant noise or only a brief chirp when the clutch engauges?
A constant noise or only a brief chirp when the clutch engauges?
Tighten the belt up and it should go away.
Not true.
-The clutch bearing is spinning (only) when the A/C is off.
-The compressor bearings are spinning only when the A/C is on.
Curtis
Clarification: When the compressor is spinning, the clutch assembly is locked up, so the clutch disk is in lock step with its shaft, namely the nose cone of the compressor. That is, the clutch disk is *not* spinning on it's shaft. The disk (and it's shaft) is of course being spun by the belt, but the clutch disk bearing is "at rest".
Curtis
No, the bearing is not at rest. When the compressor is not engauged the "rotor" portion of the clutch is rotating on the bearing. When the compressor is engauged the rotor continues to rotate on the bearing and it is rotating the clutch plate which is attached to the compressor shaft.
D-
You are correct, of course.
My mistake was thinking the clutch rotor spun on the compressor shaft. It does not; it spins on the front housing of the compressor and in fact never touches the compressor shaft.
Just for my own renewed understanding:
1) The rotor/pulley is centered on the front housing of the compressor, which is always stationary. Thus the rotor bearing is always spinning when the engine is running.
2) When the A/C is turned on, the stator (an electromagnet) pulls the pressure plate, which is locked to the compressor shaft, tight against the rotor. Rotation is then transferred from the belt, to the rotor (still spinning on the compresser housing), to the pressure plate, to the compressor shaft. The thrust bearings inside the compressor, which were previously at rest, are now spinning.
How'd I do?
Curtis
Much better Grasshopper, much better.....
Are you sure the noise is coming from the compressor? It sounds very similar to when my tensioner started to go.
Cruiser804
SILVER Star
I am trying to locate a similar noise.
Any suggestions on narrowing down the source of the noise?
Any suggestions on narrowing down the source of the noise?
any idea what part number the bearing is? althgough not essential, I'd like to pick up a new bearing before pulling the old one.
Thanks.
Thanks.
My part # on the bearing, MT2027, may not help much, but it's 30mm ID x 52mm OD x 22mm wide.
That's a Santech part number. They are out of Fort Worth, Texas, so shipping a single unit would definitely exceed the cost of the part. It's doable if you want one though.
