PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (
-   Diesel Discussion (
-   -   Kickdown=Clunk=Transmission Broke! (

84W123DT 02-21-2004 03:01 AM

Kickdown=Clunk=Transmission Broke!
My SEARCH produced no result.

1985 MB300CD Turbo w/ 221,000 km. Here's what happened:

The car is running under normal operating temperature. I pressed the accelerator hard to kickdown to merge onto the H-way and all of a sudden, CLUNK sound from the tranny. From then on I get all rpm but "no full-engagement" on the gear. I say "no full-engagement" as I was able to coast along with partial-engagement. The car appear to be stock in one gear and can move/coast the car very slowly while modulating the accelerator.

What do you think went wrong?

On my 1984 MB300DT, at 180,000 km. I completely lost all forward gears and the transmission had to be rebuilt.

These trannies are costing alot of $$$!


jbaj007 02-21-2004 11:42 AM

Is reverse normal? If it is, I'd look to the B2 piston and it's "rod".

84W123DT 02-21-2004 02:54 PM

Yes, reverse is normal. The B2 piston you're talking about, will it require removal of the tranny?

jbaj007 02-21-2004 04:35 PM

This gives you the general idea (although on a 126):

On a 123, some have done it with the trans in the car by dropping the rear support and, I believe, loosening the exhaust and manhandling it.

There was a recent post on the B2 in a 123, changed out with the tranny still in the car. Check the "search" with <B2 and 123> in the field and good luck.

All times are GMT -4. The time now is 02:27 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website