Auto fault in 4th
I have a 1986 300GDL. The autobox was fine until I put the car into my local garage for service. they changed the auto oil and filter but suggested a specialist to adjust it. I felt it was slow to change up. After collecting from the auto specialist I set off with a trailer of about two tons on a 300 mile trip. After about 100 miles I noticed slipping in 4th and the engine racing. I moved the shift to 3rd and kept it there for the rest of the trip and the return journey of about 300 miles also! Speed was kept sensible so as not to over rev or heat the engine.
When I took it back to the specialist he suggested a new modulator and that was fitted. No better. I then went to several other experts but with varying opinions. Some say it probably only needs new seals and possibly 4th gear clutches. Others say its had it and only a complete rebuild would be the solution as the box must come out anyway! However, two Merc dealerships have said it's probably only a repair and not a complete rebuild.
Just to add to the confusion (if needed!) it went into 4th ok and held it on the motorway the other day. I managed 80 ish which is about what it did before the gremlins moved in. However, after a stop it wouldn't play again and it's back to 3 wheels or should I say 3 gears on my wagen again!
Can anyone assist? Either with informed opinion or as to who could do the necessary repair. I live in the Southampton area.
Finally, I also have a 1984 230GES. Can the manual box from that be transferred???
Or has anyone got a good secondhand box to sell?
if its slipping are you sure the linkage has been put back properly. Does the lever go into first gear ok.
When I mean will it goe into first I mean can you physically pull lever into first gear, I,e do you need to force it ? , if you do then they have not put the linkage back in the correct place so when you are in drive its not selecting properly hence the slipping.
I noticed that you had it adjusted which means they might have played with the linkage but slow changing may mean one of the vacuum pipes could be split or blocked eitehr way would have an effect on change down/up.
Hi PP,
mine does exactly as you described - the lever will not physically move far enough back to engage the fist postion.
Will this effect other gear selection or just first? :idea:
yes, it would, How do I know, because the same happened to me when they did a seal in the autobox. Sometimes you had to rev it for it to go into reverse.
yes, it would, How do I know, because the same happened to me when they did a seal in the autobox. Sometimes you had to rev it for it to go into reverse.
I've been under the car and the linkages do not look as though they have been off or adjusted in years. Any adjustments done (by the local auto specialist) must have been elsewhere on/in the box, possibly whent they did the mudulator. Should I try disconnecting the linkage and adjusting it myself? ie. by putting both the selector stick and the lever on the side of the box in the neutral positions with the linkage off, adjusting the linkage to reconnect without moving either of the two aforementioned, and reconnecting?
I would take it back to them and show them your problem and see if they can explain it. You should be able to pulll stick into first there is something wrong there somewhere. Have you ask if they touched the linkage at all???
Hello I'm back. Been away for a month or so, but back on topic, mine does exactly as described above. Auto box changes OK but I'm unable to select 1st manually. I have had a poke around with the linkage but have not actually tried to adjust it in case I messed it up and ended up with no gears!
It will select 1st on its own if you floor it or if the G is under pressure (steep gradient etc.)
Is there a proceedure / measurements for adjusting the linkage?
Cheers,
Russ
I've just been able to get time to check the linkage adjustments on my 300GD's auto box. As it wouldn't go into 1st when selected in the car I disconnected the linkages underneath. Then I moved the selector lever attached to the side of the box. It would move easily and with a positive 'click' into all positions, ie. park through to 2nd. However it will not go into 1st position and seems spongy at that point. Even with the engine running and revved it still would not move into 1st. If it is an adjustment problem it seems to have to be within the box itself. Any other suggestions or ideas most gratefully received (preferably not a new box!).
having never taken an auto box apart and little knowledge, try posting the same message on www.benzworld.org. There are some guys in there that may shed a bit more light then we can.
Ok. Thanks for that. I'll give them a try and fingers crossed!
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Thanks for your reply. I've just run the engine for a few minutes and tried to put the shift lever into first as you queried. No. It will not go in. What does this tell us?