72 280SEL 4.5 A-Type A/C Compressor - Works, but Odd Noise - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 08-22-2016, 10:58 AM Thread Starter
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72 280SEL 4.5 A-Type A/C Compressor - Works, but Odd Noise

Hello Again,

I'm trying to diagnose a noise from my A/C Compressor. It's an A-Type compressor, running R12. The A/C still functions and blows cold - however there is a tapping noise coming from the compressor at all times. The noise gets 100x worse when the clutch is engaged, and then reduces back down (but does not go away) when the clutch disengages. Listen for the "tapping" sound in the background of the video below, and hear it get much worse at 10 SEC when the clutch engages:


In person, the "tapping" sounds more like hitting the compressor with a plastic mallet. Since the compressor works, my guess was that it needs a new clutch assembly, like this:

https://www.amazon.com/gp/product/B0...A2W9EGA09QPRIK

But I wanted to see if anyone else has experienced this issue before I start digging deeper and ordering parts.

Thanks in advance for any help or advice you can offer!
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post #2 of 10 (permalink) Old 08-22-2016, 11:16 AM
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Hard to tell, but it might be bearings but check if everything is securely bolted up as I see movement from the hard lines that would indicate otherwise. Rebuilt A6 compressors are cheap.

With best regards

Al

Check out the W114, W115 /8 enthusiast forum http://www.stroke8.org

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post #3 of 10 (permalink) Old 08-22-2016, 11:19 AM Thread Starter
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Originally Posted by alabbasi View Post
Hard to tell, but it might be bearings but check if everything is securely bolted up as I see movement from the hard lines that would indicate otherwise. Rebuilt A6 compressors are cheap.
Thanks for the reply. I think the movement you're noticing is just my camera moving...i just had it resting on the fender pointed down, since i had to go into the cabin and flip the switch.

A6 compressors are cheap, but I was hoping to avoid a total replacement....at that point I might as well just go to R134a.
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post #4 of 10 (permalink) Old 08-22-2016, 11:21 AM
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A good a/c shop will have recovery equipment for the R12 and it's cheaper to get 3 cans of the stuff at around $25 / can on craigslist then to switch to R134 which is still about $15/can.

With best regards

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Check out the W114, W115 /8 enthusiast forum http://www.stroke8.org

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post #5 of 10 (permalink) Old 08-23-2016, 12:34 AM
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I replaced the clutch which includes the pulley from autozone for about $70, but I think I needed a special puller tool that I rented plus another small one I bought.

I think it's the clutch on the front. I think it's easier to replace than the entire compressor. I've heard stories of people wresting them off early 107's and never reinstalling because it was so hard. Hopefully it's easier on a w108.

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post #6 of 10 (permalink) Old 08-23-2016, 12:37 AM
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Quote:
Originally Posted by alabbasi View Post
A good a/c shop will have recovery equipment for the R12 and it's cheaper to get 3 cans of the stuff at around $25 / can on craigslist then to switch to R134 which is still about $15/can.


I was hawking ebay to try and find $25 cans this summer. I got about 8 cans in total this summer. It will hold me over.

But I tell ya... My r134a converted system in my r107 280sl sure cools nicely after I recharged it last summer. This year I bought 12 oz cans of autozone brand r134a for $10/can. With how much easier it is to fill r134a, I will consider switching the connections on all them all and topping up with $10 cans as needed.

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post #7 of 10 (permalink) Old 08-25-2016, 09:37 PM Thread Starter
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Fonzi,

I am 99% sure it's the clutch. The new one came in the mail today - I'm going to try to tackle it this weekend. I actually have a friend with a Pallet full of R12, so I'm just going to top it off and keep that for now. If the compressor or something else ever dies, I'll do a conversion.
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post #8 of 10 (permalink) Old 08-26-2016, 02:50 AM
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Quote:
Originally Posted by envoy_to_the_Stars View Post
Fonzi,



I am 99% sure it's the clutch. The new one came in the mail today - I'm going to try to tackle it this weekend. I actually have a friend with a Pallet full of R12, so I'm just going to top it off and keep that for now. If the compressor or something else ever dies, I'll do a conversion.


I have a special tool that's about the size of a cigar, well, a half smoked one, and got the other puller from the autozone tool rental. I think the tool that I have is used to press the clutch on. It was apparently an SAE thread instead of Metric. I guess the old USA was ahead of the Europeans with respect to AC. Let me see if I can find the thread(s) where I did this work.

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post #9 of 10 (permalink) Old 08-26-2016, 03:00 AM
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It looks like post 12 is where you want to start reading this: http://www.benzworld.org/forums/r-c1...1622428?page=2

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post #10 of 10 (permalink) Old 08-28-2016, 09:24 AM
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How's it coming?

.

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