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1983 W123 200T
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Discussion Starter #1
Hi,
Ive asked this question on the W123 section but think I may get a better answer here.
My W123 has a 5 speed manual transmission and I ordered the correct flex disc part number which is A1074100215
It appears that the part has been updated and in the Mercedes box was W124 part number 1244110415
as shown in the photo.
If this is installed at the front, which way round does the writing face?
I'm lead to believe that the writing faces the drive shaft, but the disc that's on at present is facing the other way.
In W124, is this disc used at the rear also? If so, which way does it face then?
2643385
 

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1989 300CE & 1971 280SE; 73.5 911T
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201 Posts
Rear flex, taken from the front.
2643399

2643400

Rear flex, taken from the rear.

Front flex, taken from the rear.
2643401
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,761 Posts
The thicker parts around the bolt take up torque more likely for forward years I believe looking from here to front your drive shaft spins clockwise. So the thicker part should be to the left of every bolt.

Remember when you put your washers on ... The washers are opposite on each bolt washers are for the rubber contact only. No washers on the actual drive shaft itself.

Opposite every other bolt 4 washers... Front to back every other washer. Pull through the drive shaft the other side will have a washer. Bolt through the flex disc will have a washer the nut will not have a washer on the other side.

I hope you understand that process it's hard to explain.
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,761 Posts
As you'll have the car totally jacked up for jack stands verify the rotation I'm pretty sure it's clockwise in forward gears.

You'll need the car totally raised up with 4 jack stands all wheels off the ground. That will enable you to spin the drive shaft because access to top bolts will be difficult without the movement of the rear wheels.
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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Just remember how you remove the bolts looks like your pictures are correct.
 

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95" W124/ E220 MasterPiece and 01" W210/ E200 KOMPRESSER
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274 Posts
Marking on the flex disc always faces the driveshaft....you could also translate its markings/words on the disc with a German dictionary or Google Translate.
 

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1989 W124 260E
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1,899 Posts
They have 6 tubes 3 have longer tube inserts those go in to the propshaft...Look at this --google Model 124 Maintenance Manual Index . Click on M103 and then number 41 propellar shaft . A secition in there on w123 manual propshaft at the bottom in 40.100 on balancing prop shaft .
 

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1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
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7,281 Posts
not all 124's use the same flexdisks, and some use different flexdisks front and rear.
 

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94 E320 5 spd conversion
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955 Posts
above marking orientation is correct. diese seiten z. gelenkw = "this side toward driveshaft"
 

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1983 W123 200T
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175 Posts
Discussion Starter #11
Ok, thanks for all the info.

A snippet from the manual linked to above definitely states that my car has the same flex disc (described as tangentially soft) for front and rear.

As stated many times in flex disc threads, the writing on the disc says "this side to driveshaft"
That is fine for the front disc and shows that the disc is directional and needs to be orientated in a particular way.

My problem is the rear flex disc. On my car, this is the same as the front one. They are not symmetrical.
Fitting the rear disc with writing face the driveshaft means that the rear disc is facing the opposite way to the front. Therefore any property of the disc that relies on which way the driveshaft spins will be wrong for the rear disc.
Maybe that's just how it is?

2643579
 

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W124
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5,306 Posts
You trying to outguess the MB engineers, maybe?
The same engineers who couldn't figure out how to keep oil inside the upper timing cover? The same engineers who couldn't figure out how to seal returning oil at the cylinder head/block parting line? The same engineers who designed an alternator light that works 5% of the instances when the alternator stops charging? Should I go on? :)

biodegradable wiring, 100k mile transmission, 4-matic nightmare... (and this is the best car they ever built)
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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How many 1990s Buick regals do you see running around?

Could you imagine all the engineering problems in those cars? Front wheel drive POS.

Think about the engineering of a Mercedes The glove box handle is on the left so the driver can reach it.

The suspension is almost race car like for the day.

There's something special about them, that people keep fixing them, regardless of all their quirks. I would say they're probably over-engineered and it took Mercedes probably six years to get back all their money from developing the 124... and the couple other Mercedes from that era. At a time where computers weren't very powerful and robotics weren't the main way of building a car.

Although way more technology goes into a car these days most things are very automated and the general result is an easier build. But I believe in the 90s the Mercedes were so ahead of their time that it wasn't as easy to put all that technology and development in the car which cost a lot of money.

Just my 2cents
 

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Current, 90 300CE, 92 400E (Sold 95 E320,70 250C, 91 190 2.6, 91 420 SEL, 95 300D, 87 TD)
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1,761 Posts
I think the wiring is the biggest problem with these Mercedes. That was the dumbest thing they did (or agreed to do.. by the German government) everything else is pretty much normal wear and tear.
 

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'92 W124 230E Auto
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210 Posts
DIESE SEITE Z. GELENKWELLE means "this side to driveshaft", i.e. the writing must face toward the rear of the car (if fitted at the front behind the gearbox).
 

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1983 W123 200T
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175 Posts
Discussion Starter #19
Yup, but my car has the same part fitted at the rear... with the same writing on it
 

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1999 E320, 2000 E320, 2003 E320 Wagon, 2005 C230K SS, 2010 Accord LX w Eibach & Koni FSD's
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Why does anybody even bother with these cars?
Because you can buy older one dirt cheap all day long. Most MB owners are not DIY'ers. They're willing to pay top dollars for these cars new, but are whiners when it comes to maintenance.

If you're patient, you can find a diamond in the rough for no more than ten cent (if not 5 cent) on the dollar.
 
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