Can A/C clutch be re-built? - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 09-30-2010, 04:44 AM Thread Starter
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Can A/C clutch be re-built?

Greetings!
I am diligently working on correcting some issues on my 67 300SEL that was delivered to me last month after many years of storage. The car has a 72 280SE engine bored out to 3 liter, and was converted to 4-speed manual at the time of the engine swap.

My current project is getting at a clattering noise that is related to engine/belt speed and coming from the very front of the car. The main fan wobbled and could be wiggled with the engine stopped. I replaced the fan clutch and now it does not wiggle/wobble which is great. That was not the source of the clatter, however.

It appears the noise is related to the A/C compressor. When the A/C is turned on the clatter subsides (but is not gone). Interestingly, the tension of the V-belt slackens substantially when the A/C is engaged, even though no pulley or wheel appears to shift at all. The electromagnetic clutch appears to be doing its job as the hub spins when the a/c is engaged and stops when shut down.

Can I pull that clutch housing from the compressor and clean/re-build it, or is it a sealed unit that needs to be purcha$ed?

As always, thanks for your advice and input.

Old Benz Fan
(Dreamt about W108/109 for 37 years and finally got one!!)
1967 300SEL - White on blue velour
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post #2 of 5 (permalink) Old 09-30-2010, 05:50 AM
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Remove belt and spin compressor belt pulley and adjuster pulley. Check it for wobble and noise. Spin compressor by the hub. It should turn without binding. It is not going to spin freely. Clutch can be replaced with compressor on the bench. There is not enough room for pullers to do it on the car (W108). Bearing for compressor pulley is available as well.

Replacing The AC Compressor Clutch


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1972 280SEL 4.5
1999 ML320
2000 E320
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post #3 of 5 (permalink) Old 10-01-2010, 01:36 PM
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Vehicle: 1971 280SE 3.5 Coupe
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Here is a place you should be able to get the parts:

Ray's Auto Air & Heat - Auto Air Conditioning Parts & Accessories, A/C Hoses & Fittings

I would replace the idler pulley also. It's only about $20 from Autohauz Az

Tony
280SE 3.5 Coupe
Stick shift
3.27 Axle
5.6 Iron block build in progress
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post #4 of 5 (permalink) Old 10-02-2010, 09:20 AM Thread Starter
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Thanks for the input! A mechanic also told me to check the spacing on the pulleys because if that is not correct it could be the cause of the clatter as well. I will study the scenario in my new (to me) service manual as well. Gosh this is fun! I guess the old joke applies to this car as well:
Q: How many repair or correction projects do you need to do before your old car is just right?
A: Just one more!

Thanks.

Old Benz Fan
(Dreamt about W108/109 for 37 years and finally got one!!)
1967 300SEL - White on blue velour
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post #5 of 5 (permalink) Old 10-08-2010, 05:14 AM Thread Starter
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Wrong diagnosis!

Problem solved. Not the A/C clutch at all, as the clatter continued when I removed the belt and started the car. It was the pulley on the alternator, which was moving about a quarter turn in either direction, independently of the cooling blade. I pulled the alternator (big fun!), reversed the pulley and tightened down. Now I am clatter-free, however the alternator light on the dash has a very faint glow. What did I do now?!

Old Benz Fan
(Dreamt about W108/109 for 37 years and finally got one!!)
1967 300SEL - White on blue velour
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