[W126 Coupe] Re: (W126) Odd Trans Problem

[Demetre at Eurospec]

hey can any one give me some advice iv got an 89 560 sec it has started giving me a slight ticking noise from motor and iv noticed only every time im at a traffic light and i accelerate from a stop position it will blow a cloud of oil smoke cloud out the back any clues and is it pricey to fix 
  ----- Original Message ----- 
  From: mfmeyer at iwon.com 
  To: mbcoupes at mbcoupes.com 
  Sent: Friday, April 21, 2006 9:16 AM
  Subject: RE: [W126 Coupe] Re: (W126) Odd Trans Problem


        I've been doing a lot of research on trans "servicing" versus "flushing" as I would like to switch my trans fluid over to Amsoil, like I have already done with the engine oil. I regularly "service" my trans fluid every 25K miles. I don't do it myself, as most cars don't have a drain plug on the pan so its too messy to do at home. I usually ask for them to drain the torque converter "if they can" - meaning if there's a drain plug there they can drain that too, if not, you can't.

        So...getting back to my Amsoil switch. Most places don't like you to supply your own parts/fluid, so I started asking around if I could change the fluid in the torque converter of my Taurus. I was told there is no plug. So I guess in the past they have been dropping the pan, changing the filter and gasket, and then adding in lost fluid. Now I don't want to do this with Amsoil as then it will be a mix of Amsoil and old stuff in the torque converter. So I started researching on the web. Yeah - the Bible, right?! I was a little surprised in what I found. I found out that most places don't recommend servicing if you don't know the last time it was done, or the fluid isn't reddish, or it smells burnt, etc. One place I found (http://www.goss-garage.com/) emailed me back and recommended I "flush" the trans. In emailing back and forth, they said if I can't find a place to use my Amsoil fluid, I could do it myself by taking the lines off the radiator (trans cooler lines), put the output line into an empty pan, and the input line should have a line/funnel attached where you can pour new fluid in as the old drains out the other line into the pan. He suggested putting "flush chemicals" in first, driving for half an hour, then doing this, and not even worrying about changing the filter! If I wanted to do the filter, do it first, add in lost fluid with cheap stuff, then add flush chemicals and do the actual flush itself.

        I am not sure yet how I want to proceed, as I read lots of warnings about failures shortly after doing such a procedure. Most said it was because the filters weren't being changed since flushing involves a "closed system", and flushing could loosen up crud that then gets stuck in the filter and causes problems shortly thereafter.

        Logic tells me to add the flush chemicals, run the car, then drop the pan, change the filter, add in some cheap fluid to top it off, then flush through with new fluid. I was warned that doing it this way you need to be careful with your skin as those flush chemicals are harsh. So now I'm wondering if I do the flush but skip the chemicals.

        This chain seemed like a good time to pose my thoughts here as well and see what people thought, what they have been doing (dropping pans and replacing fluid versus true flushes), etc.

        Comments? Thoughts?

        Markus



        Markus Meyer
        484-919-9762 (cell)
        http://www.meyerprobateproperties.com/

        --- On Thu 04/20, Mister McGoo < eelploot at hotmail.com > wrote:


          From: Mister McGoo [mailto: eelploot at hotmail.com]
          To: mbcoupes at mbcoupes.com
          Date: Fri, 21 Apr 2006 02:54:52 +0000
          Subject: RE: [W126 Coupe] Re: (W126) Odd Trans Problem


          (a) I wouldn't advise ever overfilling your transmission. Something else is happening in there. 

          (b) Is someone claiming that new transmission fluid wrecks transmissions? Huh? Do Audis prefer used transmission fluid? Are the seals held together by dirt? Why risk changing your filter, then?

          (b) Recent surveys indicate that the GDP of Peru exceeds $3,000, 3 out of 5 years, 85% of the time. 

          -Bellamy







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            From: "jeffk at gsm.udallas.edu" 
            Reply-To: jeffk at gsm.udallas.edu,Mercedes Coupes Mailing Lists 
            To: mbcoupes at mbcoupes.com
            Subject: [W126 Coupe] Re: (W126) Odd Trans Problem
            Date: Thu, 20 Apr 2006 19:29:51 -0400
            >Many thanks to all for your prompt suggestions. This is what I'm faced with:
            >
            >1. Last complete tranny service was around 20k miles ago. No hard driving,
            >neither extremes of climate. Level always seemed ok (yes, I check it under
            >conditions recommended by Richard and Robert). Before this incident, car
            >hadn't been driven for two months while I was away, but showed no untoward
            >signs on startup. There is no external leak.
            >
            >2. If there is so much fluid transfer between the t-converter and sump that
            >the cold level is high while the hot level is very low (again, trans shifts
            >smoothly for a mile or so upon startup), perhaps the t-converter is
            >evacuating too much fluid thus starving the tranny and causing
            >non-shifting? Would the solution (though iconoclastic) be to overfill the
            >cold sump to ensure the tranny gets enough fluid? Is there a valve/seal
            >that should prevent the t-converter from draining?
            >
            >3. I can drain the sump and t-converter, change the filter etc., and refill
            >per Dick Spellman, but was always leery about introducing completely new
            >fluid. I blew out an Audi tranny doing this and subsequently read that new
            >fluid dissolves things in there that are best left undisturbed.
            >
            >To overfill or not, that is the question. Trouble is that I am aware that a
            >wrong move at this point may end up costing me the GDP of Peru.
            >
            >Thanks,
            >
            >Jeff Khan
            >
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            >
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