Hi Loren,
The valve body looks like a maze - with al the passageways having speing
loaded steels balls that are actuated by hydraulic pressure. The danger is
when opening some of the housings you will be treated to the sight and sound
of a steel ball being propelled at slightly subsonic speed across the room -
ending up the the most difficult of places to extract it from. BTDT.
It would be preferable for you to have a diagram of what the different
balls/springs do before taking things apart. Something as small as a piece
of lint from a paper towel used to check the ATF level can cause problems.
Even though you changed the fluid & filter a few months ago doesn't mean it
wouldn't benefit from another change.
There are few AT technicians around who work on these things - partly
because of the complexity and partly the economical logic doesn't work -
it's quicker to replace the AT with a rebuilt or used unit.
Also, if you buy a rebuilt AT they may want your AT as core - and they do't
like to get a core that's been disassembled.
I wouldn't hesitate to replace the primary pump or the bands, but if the
valve body needs work, I'd try to find a used or rebuilt one. I suspect a
new one. if available would be pretty steep. You may want to find someone
who can say *exactly* what is wrong before doing much else. Sometimes the
local stealerhip will put their gauges on a AT & diagnose it - but more
likely they'll say it's broke - you need a new one.
Good luck -
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
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.
----- Original Message -----
From: "Loren Faeth" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, August 23, 2006 11:21 PM
Subject: Re: [MBZ] 124 Trans diagnosis
Herr Doktor,
Is any of this fixable from underneath, without removing the trans? I put
a filter and fluid in not long ago, I think it was May. It has been
working just fine, and was going down the highway when this started. A
broken spring or a blown oring seem plausible. How is the valve body
sealed to the transmission? are there orings? Are there springs in the
valve body? I apologize if these are dumb questions, but I have avoided
working on AT until now. (only had manual trans until we got the 240D
about 10 years ago.)
Loren
It's all a matter ATF pressure. Sounds like you are loosing pressure as
the transmission fluid heats up and that causes the transmission to
downshift and to NOT shift up. It can be a matter of wear, dirt in the
valve body, scarred seals, a broken spring, etc.
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84
190D 2.2 229Kmi (retired)
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Loren Faeth
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