Author Topic: Erratic speed cable under repair (Read 3880 times)

yves · « **on:** October 05, 2020, 12:30:57 »

I have decided during those windy days to solve the annoying erratic speed cable.... By the way i'd like to replace the gasket sealing the rear box cover plate , and wanted to know if i must take care of an issue doing that...?
I have already found an un tightened bolt which explain the "erratic" needle but as i am under the car the oily gasket seems to be replaced. Can i only unscrew the bolts of the plate after draining out the box oil ?

yves · « **Reply #1 on:** October 05, 2020, 12:58:41 »

some more pics showing the job...

The car is on the pit and the box is on some wood blocks

yves · « **Reply #2 on:** October 05, 2020, 12:59:48 »

some more pics...

Pawel66 · « **Reply #3 on:** October 05, 2020, 17:11:58 »

Do you know the tightening torque for manual and auto?

WRe · « **Reply #4 on:** October 05, 2020, 17:53:26 »

Hi,
I would replace the old style hexagonal flex disc with a new style round flex disc because these are improved and more robust and don't need a correct orientation. Price for a new one (e.g. Febi Bilstein 14930, ~40€) is out of all proportion to the effort.
Don't forget to allign the propshaft at the rear transmission mount: https://www.sls-hh-shop.de/main/en/mercedes-230-280sl-w113-22-enginemounts-c-3_61.
...WRe

yves · « **Reply #5 on:** October 06, 2020, 07:00:14 »

Good question Pawel..... and the answer is ....?

4.3 M/KG as the manual says

WRe · « **Reply #6 on:** October 06, 2020, 08:46:07 »

Et voilà!
...WRe

Pawel66 · « **Reply #7 on:** October 06, 2020, 08:59:23 »

Thank you!

I wish I had that when I was fixing mine...

Now mine is not erratic, it just stays at zero and jumps to about 30km/h, then works normally.

yves · « **Reply #8 on:** October 06, 2020, 15:09:49 »

To Wre ? Idon't understand what torque i must put on the nuts of the flex disk... The manual says 4.3m/kg and your pic is very different 14-15 m/kg or 8m/kg ( for automatic box?)
It is now my mind which is erratic...

Pawel66 · « **Reply #9 on:** October 06, 2020, 16:05:05 »

Quote from: yves on October 06, 2020, 15:09:49

To Wre ? Idon't understand what torque i must put on the nuts of the flex disk... The manual says 4.3m/kg and your pic is very different 14-15 m/kg or 8m/kg ( for automatic box?)
It is now my mind which is erratic...

i think these torques are for the flange nut on transmission output shaft. This torque is important to eliminate erratic speedo work.

Flex disc is here: https://www.sl113.org/wiki/DriveShaft/FlexDisc

And you really follow these instructions - direction sof bolts, etc. - everything to be done by the book. The torque 4.3kg/m is there.

yves · « **Reply #10 on:** October 06, 2020, 17:43:50 »

Thank's Pawel it is exactly what i had understood but now i am sure to tight at the right Torque....

Pawel66 · « **Reply #11 on:** October 06, 2020, 19:34:53 »

Credits to WRe!

ja17 · « **Reply #12 on:** October 07, 2020, 00:31:04 »

Don't forget the thick shim-washer between the transmission mount and the mounting plate.

yves · « **Reply #13 on:** October 10, 2020, 15:56:10 »

I have a problem with the seal ring for the speed cable :
How can i take out the shaft with its pinion allowing to replace the radial shaft seal ?
I have tried "gently " with a hammer at each end without succes ... i have searched a pin somewhere idem !
The BBB show another box and another situation for the speed cable housing...?
PS: at the end (1) of the shaft there is a circular groove i thought it was for a circlip or an easy "grip" topull the shaft?

ja17 · « **Reply #14 on:** October 10, 2020, 19:22:34 »

The gear is a press fit. You can press it out or tap it out with a soft drift (brass). Be careful not to mushroom the end of the shaft. Heating the gear will help, do not use too much heat and damage the aluminum housing. There is no clip in the groove, it may just be a reference for installation? I have always driven it from the flat ringed
end and out of the cable end.

yves · « **Reply #15 on:** October 10, 2020, 20:57:07 »

Hi Ja17, sorry if t is an obvious question : you say i can press from (1) on my photo to (2)

yves · « **Reply #16 on:** October 11, 2020, 08:23:45 »

I began to press the shaft out of its casing but after about 2 cm it seems to be stopped and the pressure increase without any movement...! am i right to continue....?

ja17 · « **Reply #17 on:** October 11, 2020, 15:36:25 »

As long as the end of the shaft has not been flared from previous tapping, you should be able to continue. Your set-up looks good. I assume there is an opening in the plate for the shaft to move through?

yves · « **Reply #18 on:** October 11, 2020, 16:52:51 »

Thank's Joe .... i have removed the shaft after warming until 100C° and found why it was difficult: there was a kind of circlip ring around one end of the shaft that i didn't see....!
Now the gear, shaft, and "groove ring" are on the bench. But i wonder how i can extract the radial shaft seal from its housing ...?
( the new one is on the photo: 1 , the old one still in its housing )

Do you have a trick before i do something wrong?

yves · « **Reply #19 on:** November 01, 2020, 21:01:45 »

Refitting the cover with new seals , replacing grease nipple (broken inside .... $:-\$ )

yves · « **Reply #20 on:** November 01, 2020, 21:03:04 »

the end ...!
I have taken out the nipple with a "tourne à gauche " anticlockwise "screw"

Cees Klumper · « **Reply #21 on:** November 01, 2020, 23:27:34 »

Congratulations, challenging job this was, it probably looked pretty easy at the start ...

ja17 · « **Reply #22 on:** November 02, 2020, 05:58:04 »

The flat washer always goes next to the rubber flex disc. So three bolts get the flat washer under the nuts and three bolts get the flat washers under the head of the bolts. Looks like you might have all six under the heads of the bolts?

yves · « **Reply #23 on:** November 02, 2020, 09:26:01 »

Thank’s a lot Joe i was so focused about the torque.......! What stupid guy am I....🙄 for my great pleasure i’ˆll have a go in the pit 🙄

ja17 · « **Reply #24 on:** November 02, 2020, 15:35:37 »

Yves, I am not sure that it is critical?

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Author Topic: Erratic speed cable under repair (Read 3880 times)