tranny problem - PeachParts Mercedes-Benz Forum

sw8_2dg · #1 01-01-2010, 05:13 PM

I have a 1983 300D turbo, automatic. When I put the car in drive or reverse it doesn't move right away, there is a long delay. I push the pedal and the engine just revs. When it does move, it moves slowly. Prior to this it was driving but had no power at all. I diagnosed it to be a vacuum issue.

I have replaced the engine vacuum lines and the 3/4 way T's. I also replaced the yellow check valve, the vacuum tranny damper/dashpot (000 304 02 34 green check valve), the vacuum central plug (it was dry rotted), and the 2/3 way valves and flippers on top of the valve cover under the black lid. I have a new tranny vacuum modulator but have not installed it.

Any thoughts?
matt
sw8_2dg@yahoo.com

whunter · #2 01-04-2010, 02:05 AM

Multiple issues are possible:
* Low transmission fluid ?
* Vacuum not reaching the modulator?
* Bad vacuum modulator?
* K1 springs bad ?
* B2 piston failure ?
* Damaged/mis-adjusted Bowden Cable ?
* Damaged clutch friction disc's ?

Transmission:

info on 722.3 - 722.5 transmissions
info on 722.3 - 722.5 transmissions

Vacuum Modulator links thread
Vacuum Modulator links thread

transmission slipping need expert advice please
http://www.peachparts.com/shopforum/diesel-discussion/86779-transmission-slipping-need-expert-advice-please.html#post566361

MERCEDES-BENZ TRANSMISSION VACUUM CONTROL SYSTEM "TUNING"
by Steve Brotherton First Published in: ImportCar∞ Feb 2002
http://www.peachparts.com/Wikka/TransVacTune

Transmission shifting response & “vacuum span” (Stevebfl, are you out there?)
http://www.peachparts.com/shopforum/tech-help/19841-transmission-shifting-response-vacuum-span-stevebfl-you-out-there.html#post100041

It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ...
It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ...

Vacuum Control Valve
http://www.peachparts.com/shopforum/diesel-discussion/121418-vacuum-control-valve.html#post869411

Bad Vac Control Valve?
http://www.peachparts.com/shopforum/diesel-discussion/117168-bad-vac-control-valve.html#post834716

I broke the K1 repair kit!!! What did I do wrong?
I broke the K1 repair kit!!! What did I do wrong?

K1 Spring Kit
K1 Spring Kit

another K1 thread
another K1 thread

Run, don't walk, to the dealer, get a K1 kit!!!
Run, don't walk, to the dealer, get a K1 kit!!!

replacing B1 piston
http://www.peachparts.com/shopforum/tech-help/131810-replacing-b1-piston.html#post962646

B2 Piston Failure
http://www.peachparts.com/shopforum/showthread.php?p=1048115

722.118 transmission B2 servo/piston *B2 Piston*
722.118 transmission B2 servo/piston

I Am Really Hurt Now *B2 Piston*
I Am Really Hurt Now

car won't reverse!!!!!!!!!! HELP!!!!!!!!! *B3 piston*
http://www.peachparts.com/shopforum/diesel-discussion/131896-car-wont-reverse-help.html#post963365

Two threads the same title, but different authors and content.
Bowden Cable
Bowden cable, is this the adjustment
Bowden cable...

Replacing all shifter bushings on W126 - p.1
Replacing all shifter bushings on W126 - p.1

The master threads where the links came from..

Fast navigation Do It Yourself Links
Fast navigation Do It Yourself Links

Transmission:
Transmission:

Note:
Moving this thread to "Diesel Discussion" for more on topic answers.

Have a great day.

tbomachines · #3 01-04-2010, 08:17 AM

Why do you keep reposting this? You've already got answers in the other threads you started...your problem is likely the B3 piston for reverse, which is included in the links above. It may also be the B2 for forward motion, but you really need to begin troubleshooting. Check the fluid levels before anything.