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Old 02-21-2004, 04:01 AM
84W123DT
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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 $$$!



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Old 02-21-2004, 12:42 PM
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Is reverse normal? If it is, I'd look to the B2 piston and it's "rod".
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1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 02-21-2004, 03:54 PM
84W123DT
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Yes, reverse is normal. The B2 piston you're talking about, will it require removal of the tranny?
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Old 02-21-2004, 05:35 PM
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This gives you the general idea (although on a 126): http://business.baylor.edu/Richard_Easley//autofaqs/b2piston.htm

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 in the field and good luck.

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