[W126 Coupe] lazy transmission

[Markus Meyer]

Actually, there's quite a bit of fluid in the converter, almost half.

Also, don't you have a drain plug on your pan too?  I do on my gen2's, so I
drain it that way first, then take the pan bolts off.

I also have a large magnet which catches the metal flakings quite well.

Markus

2009/12/19 Iain Gunn <igunn at bmts.com>


>  Vance, until the fluid and filter is changed, your really have no

> starting point. It's like trying to diagnose a cold engine. As far as

> draining the converter, most standard shops don't do it, because they figure

> there is not much in it anyway, so its not worth the time. I drained mine,

> no big deal. What's more important is that when you drain the pan, you

> remove all the bolts except one in the corner slowly. This drains the

> transmission pan slowly, so when you finally remove the last bolt, you have

> not washed all the sediment out of the pan, because you want to observe what

> is in there. If its got large pieces of aluminum or steel in there, 1/16"

> and larger, you may be in trouble.

> If its just, small bits of brass and dust, that's normal, that's what the

> clutch plates are made of.

> Good Luck, Iain

>

> ----- Original Message -----

> *From:* Vance Rowley <vance_rowley at hotmail.com>

> *To:* mbcoupes at mbcoupes.com

> *Sent:* Saturday, December 19, 2009 7:26 AM

> *Subject:* Re: [W126 Coupe] lazy transmission

>

> Hi Markus,

>  I am probably due for a change and intend to get it done, although there

> is no burn smell from the existing fluid.

> Is there a particular brand of synthetic that you would recommend?

> I have been putting this off for quite a long time now. Main reason being,

> after the last time I had it done, I finished up with shift problems worse

> than I have now. To cut a long story short, after several visits back to my

> local MB service centre (with no results) I gave up. Then one day while

> searching for something around the house, I came across a bottle of

> Transmission Reconditioner which I forgot I had as part of a package I

> bought sometime in the past. I thought (can't do any harm) and dumped it in.

> About a week later, the transmission suddenly started working perfectly, and

> has done until recently.

> You can probably see my way of thinking and reluctance to getting a fluid

> and filter change, as this would mean the Transmission Reconditioner I put

> in (which I forgot the brand) would also be drained off. Although I

> discovered the last time I had it done, the torque converter was drained

> also, which I believe is the correct procedure. (could this have been the

> cause of the original problem?) I believe there is a hot debate going on

> whether or not to have the TC drained.

> So, should I go ahead and have a complete fluid and filter change with TC

> drain, or just try the fluid and filter without bothering with the TC? Your

> thoughts (and anyone else's) are greatly appreciated.

>

> Cheers,

> Vance.

> ------------------------------

> Date: Fri, 18 Dec 2009 11:27:51 -0500

> From: markusfmeyer at gmail.com

> To: vance.rowley at thestart.eu; mbcoupes at mbcoupes.com

> Subject: Re: [W126 Coupe] lazy transmission

>

> When is the last time you changed your trans oil and filter?  If more than

> 25-30K miles ago, its time.  I found when I switched all my vehicles over to

> synthetic they responded quite well and shifted better, your experience may

> vary.

>

> Markus

>

> 2009/12/18 Vance Rowley <vance_rowley at hotmail.com>

>

> Not heard from anyone in a while. Had problems with my email, so changed

> it.

> Anyway, getting back to the subject, I have recently been having what I

> would call lazy shifting with the transmission. There is no slipping and

> seems fine on starting off as normal (in 2nd as it does) and also seems fine

> by flooring it to get 1st and then back to 2nd. But then (under

> normal acceleration) it can't seem to make up it's mind when to shift to

> 3rd, although this isn't as bad as it is from 3rd to 4th. Even after

> reaching a constant speed of say 30mph in 3rd (and the E/S switch set at E)

> most of the time it will just stay in 3rd and not drop into 4th. Sometimes

> it will, but most of the time I have to blip the throttle a little, then

> ease off for it to drop into 4th. Sometimes even this doesn't work.

> Summary is all downshifts seem fine and upshift from 1st to 2nd is perfect.

> Upshift from 2nd to 3rd is OK most of the time, but upshift from 3rd to 4th

> depends on what mood it's in at the time.

> Should I just change my tranny fluid and filter, or is there some other

> explanation for this?

>

> Cheers,

> Vance

> 91 560sec euro

>

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