removing ac compressor belt 300sd

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Rooster - 10 May 2009 19:22 GMT

Hi all,
I've searched past posts and been under my car,
but I'm still not sure how to get the belt off the
ac compressor for my 1984 300sd.

Is there a tension adjustment screw somewhere
or do I just undo the three bolts?

Thanks again,
Jeff

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Roland Franzius - 10 May 2009 22:00 GMT

Rooster schrieb:

> Hi all,
> I've searched past posts and been under my car,
[quoted text clipped - 3 lines]
> Is there a tension adjustment screw somewhere
> or do I just undo the three bolts?

Look for the belt tightener. Its the smallest pulley with a shock
absorber attached.

Belt tensioner

http://www.detali.ru/cat/oem_mb1.asp?TP=1&F=140134&M=603.971&GA=722.367&CT=M&Cat
=503&SID=20

and V-belt

http://www.detali.ru/cat/oem_mb1.asp?TP=1&F=140134&M=603.971&GA=722.367&CT=M&Cat
=503&SID=13

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Roland Franzius

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Ximinez - 11 May 2009 18:46 GMT

> Rooster schrieb:
>> Hi all,
[quoted text clipped - 15 lines]
>
> http://www.detali.ru/cat/oem_mb1.asp?TP=1&F=140134&M=603.971&GA=722.367&CT=M&Cat
=503&SID=13

I'm permanently amazed how you guys manage to navigate that russian
site. Unless you read Russian of course...

So, what's the secret?

X.

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Roland Franzius - 11 May 2009 20:42 GMT

Ximinez schrieb:

>> Rooster schrieb:
>>> Hi all,
[quoted text clipped - 22 lines]
>
> X.

There are two lists of manufacturers on http://www.detali.ru, one in the
center of the page, the second in the collumn on the left.

One is mostly in english the other russian only.

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Roland Franzius

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Wan-ning Tan - 12 May 2009 05:56 GMT

I assume OP is in US and his 84 300SD is a W126. W140 did not come to
US until 94, I think, when W126 ended. The engine should be OM617. The
quoted pictures are for OM603 which is much newer.

Apparently this Russian site has the European models. Most US models
use engines bigger than their comparable Euro models.

I did not know the 300SD (and the later 300SDL) were not available in
Europe. MBUSA sold enough 300SD to be profitable. If 300SDL was only
available in US, I estimate there were no more than 10,000 produced (in
86 and 87). Can anyone confirm?

> Ximinez schrieb:
>
[quoted text clipped - 30 lines]
>
> One is mostly in english the other russian only.

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Ximinez - 12 May 2009 07:50 GMT

> I assume OP is in US and his 84 300SD is a W126. W140 did not come to
> US until 94, I think, when W126 ended. The engine should be OM617. The
[quoted text clipped - 7 lines]
> available in US, I estimate there were no more than 10,000 produced (in
> 86 and 87). Can anyone confirm?

13,830 of the 300 SDL
2,925 of the 350 SDL

http://en.wikipedia.org/wiki/W126#Saloon_models

It's very strange that the diesel models were sold only in the US. AFAIK
diesel cars in general were much more popular in Europe than in the US
in those days. (still are, I think, in Holland 28 percent of all cars
sold are diesels)

X.

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Roland Franzius - 12 May 2009 08:55 GMT

Ximinez schrieb:

>> I assume OP is in US and his 84 300SD is a W126. W140 did not come to
>> US until 94, I think, when W126 ended. The engine should be OM617.
[quoted text clipped - 17 lines]
> in those days. (still are, I think, in Holland 28 percent of all cars
> sold are diesels)

In these old times an european S-class customer bought it as a status
symbol. The S-class feeling was primarily the sound of the doors, the
nearly noiseless driving and from time to time a boost to 200 km/h in
less than 300 meters.

Diesels were mainly for taxis, farm wagons and and other poeple with
access to tax free diesel fuel and no need for engine power.

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Roland Franzius

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Ximinez - 12 May 2009 10:02 GMT

> Ximinez schrieb:
>>> I assume OP is in US and his 84 300SD is a W126. W140 did not come
[quoted text clipped - 23 lines]
> nearly noiseless driving and from time to time a boost to 200 km/h in
> less than 300 meters.

I know, I own one since last week ;)

> Diesels were mainly for taxis, farm wagons and and other poeple with
> access to tax free diesel fuel and no need for engine power.

I don't recall diesel was ever tax-free here in Holland. People drove it
because it was cheaper for high-mileage purposes.

I just traded in my w124 diesel and yes, the w126 is a lot quieter and
faster and the door are much more vault-like.

X.

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Wan-ning Tan - 12 May 2009 13:59 GMT

Thanks for the confirmation. I was surprised these old diesel were only
available in US. I thought US car buyers prefer power rather than
economy. Before a year ago, all car ads talked about the horsepower,
many sedans in the 200s or even 300s HP. I never understand why so much
power is needed. My 190D 2.2 has only about 75HP and it doesn't fail on
me, even when merging into highway. Yeah, some more power may be better
but not 3-4 times.

>> I assume OP is in US and his 84 300SD is a W126. W140 did not come to
>> US until 94, I think, when W126 ended. The engine should be OM617.
[quoted text clipped - 19 lines]
>
> X.

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sk8in99@gmail.com - 13 May 2009 03:13 GMT

> Thanks for the confirmation. I was surprised these old diesel were only
> available in US. I thought US car buyers prefer power rather than
[quoted text clipped - 27 lines]
>
> > X.

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Rooster - 13 May 2009 05:14 GMT

This is all very interesting, but is there anyone out there who can
tell me
how to loosen the belt for the ac compressor on my 1984 300SD 126 car?

Gratefully,
Jeff

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Roland Franzius - 13 May 2009 08:59 GMT

Rooster schrieb:

> This is all very interesting, but is there anyone out there who can
> tell me
> how to loosen the belt for the ac compressor on my 1984 300SD 126 car?

If it is the old 300D engine with twentysome belts cut the old belt and
turn in the new one with a wooden or plastic lever egde over the pulley
rim. Turn the crankshaft at the screw (forward sense of rotation
please). If the belt is running behind the other belts for alternator
(probably not) and steering pump you probably have to demount all the
pulleys. But its really easier to cut all the belts and mount new ones
in the appropriate order.

Unfortunately for the 300SD with the old diesel from the 123 300D

http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=123130&M=617.912&GA=722.118405&GM=71
6.005++++++++++++++717.400&CT=M&cat=143&SID=01&SGR=010&SGN=02

there is no picture or hint of the AC.

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Roland Franzius

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Ximinez - 12 May 2009 07:40 GMT

> Ximinez schrieb:
>>> Rooster schrieb:
[quoted text clipped - 28 lines]
>
> One is mostly in english the other russian only.

That was a lot simpler than I expected.
I was clicking on the center one ;)

Thanks!

X.

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