Auto Gearbox

manpolsabre

Active Member
Joined
Jun 25, 2003
Messages
60
Location
Manchester
Car
1992 300D
I don't know if its me but the auto g/box on my 1992 300D sometimes feels like it's slipping a bit changing from 2nd to 3rd gear. I also think it's more noticable when the engines cold.

The g/bpx oil has recently been changed and the level is OK.

Any one any ideas as to what it might be.?

PLEASE PLEASE tell me it's not an expensive job, otherwise I will have to send the other half out to work full time! :D

Bob
 
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manpolsabre

Active Member
Joined
Jun 25, 2003
Messages
60
Location
Manchester
Car
1992 300D
Forgot to say. It seems to be more pronounced when the engine is cold and accelerating slowly.
When I accelerate quickly with higher revs it doesn't do it :crazy:

Bob
 

Dieselman

Banned
Joined
Jul 13, 2003
Messages
34,206
Car
Peugeot 403 Convertible
Two things spring to mind.

On most MB boxes the change up from 2nd is delayed when cold to assist with engine warm up.

On the side of the gearbox is a vacuum modulator which slurrs shifs depending on how much power / torque is being delivered. The greater the power delivery the harsher the change to reduce slip.
The modulator may want a small adjustment to bring the changes in a bit harder.

As a test you could try disconnecting the vacuum line to see if the slurr stops, although shifts will then be harder.
 

dino

New Member
Joined
Nov 17, 2004
Messages
1
Getting the same problem

I've got exactly the same problem on a 1994 E320 cabriolet. Dieselman, any chance of some pictures of where this adjustment is? I've got very smooth shifting at the moment - too smooth - and i'd prefer to firm it up so that the 2-3 upshift problem may go away without a k1 clutch replacement.

cheers, dino
 

R2D2

MB Enthusiast
Joined
Mar 23, 2004
Messages
6,957
Car
C350
Moved as this is Engine and Transmission stuff!
 

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