Auto Gearbox

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Oldgerman
Dernburg Wagon
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Joined: Wed 18 Jan, 2006 2:44 pm
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Auto Gearbox

Post by Oldgerman » Wed 18 Jan, 2006 2:56 pm

Hi,

I am about to buy a 68 280SE with an auto box. The gearbox is quite harsh when it changes up as I accelerate but seems to be quiet and smooth in gear. I am not that familiar with automatics, particularly those that are 38 years old, is this reasonable expectation for this type of gearbox (3 speed) at this age or is this a sign of something drastic about to happen? (I don't believe so, but this is why I am asking for help!).

I know these boxes are relatively complex for their time in terms of vacuum signals from engine etc. Is this a sign that a hose has come off or that something is out of adjustment?

Thanks in advance

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O319-coach
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Post by O319-coach » Wed 18 Jan, 2006 4:47 pm

Box is a 4 speed not three speed and has electronic controls for the solinoid that is on top of it. there is a switch on the throttle body and under the accelerator.

If all changes are harsh then you may have a modulator problem, these are adjustable to some extent. If the box is toast a rebuild is over $4000.00 if done correctly as there are no aftermarket parts aavailable for them, you cant even buy a kit, so all parts are genuine and need to be ordered one at a time!

If it does die most people just fit a good used box, which we would sell for around $500.00 depending on its history.
John Green
Independent importer of discounted genuine Mercedes-Benz parts.
Restorer of Concours winning cars.
Sponsor of this forum.
http://www.mbspares.com.au Toll free phone 1300 787 300

CraigB
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Post by CraigB » Thu 19 Jan, 2006 11:34 am

Hi Oldgerman

With my first 108 i thought the same thing, that it was a 3 spd, due to 3 positions on the gear selector and it felt like 3 gears it changed through. I have driven my outo for some time now but I think it might take off in second and only use 1st if you floor it or take off with the selector in the lowest gear position. ..... or maybe it was that there was something wrong with my first one and this is what it did?

Anyway, I just mentioned this in case you were confused with John's remark it is a 4 spd, which it is because that is all they made.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

Oldgerman
Dernburg Wagon
Posts: 7
Joined: Wed 18 Jan, 2006 2:44 pm
Model you own: w901-905

Post by Oldgerman » Thu 19 Jan, 2006 12:12 pm

Thanks for that. I was confused by looking through lots of adverts for similar cars, many of which had owners who were also confused (some said three, some said four).

I must admit I am quite impressed that the box does have 4 gears for the time, and in comparison with its peers, that is pretty advanced. Only what you would expect from those clever Germans eh?

Now all I have to do is fix the indicator, so that it actually follows the gear lever! I did hear that fishing line was the best fix but to be prepared for this to fail over and over again.

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O319-coach
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Post by O319-coach » Thu 19 Jan, 2006 12:29 pm

Use steel tracer line to repair it.
John Green
Independent importer of discounted genuine Mercedes-Benz parts.
Restorer of Concours winning cars.
Sponsor of this forum.
http://www.mbspares.com.au Toll free phone 1300 787 300

CraigB
OZBENZ Admin
Posts: 4905
Joined: Thu 23 Jun, 2005 1:18 pm
Model you own: I own multiple different models
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Post by CraigB » Fri 20 Jan, 2006 11:06 am

Yes I was successful with the tracer line that was stainless and plastic coated and really cheap for a roll from a fishing shop. My mistake at first was to use a line that was about the same thickness as the original. It was a bit sticky in operation. I went back and bought a thinner line, because after all, this stuff is designed to hang on to big aggressive fish and not just little bits of plastic for a gear indicator! It worked beautifully. To make a loop that gave me some adjustment at the end of it, I used the brass collar and screw out of an electrical connector (i think they call them bluepoints or something like that).
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

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