Auto box question 300te24

[paulb300]

My gearbox works ok but you do feel the changes a little bit more than I think you should but only 2-3 and 3-4, 4-5th is always smooth. 2-3 can be quite jerky at times and very much so when cold and also kickdown is very fierce when used for the first 2-3 times from cold but gets smoother after a few miles.
THe box is very smooth when the car is fully loaded carrying a lot of weight. Is this a sign that the box is in need of rebuilding?

Any help would be great. Thanks!

 

[Bolide]

Paul

I think the short answer to your question is: yes

It's possible to run a W124 auto box for a few years before it starts to slip in gear so you may decide it's liveable-with. On a car of that age I'd suggest dropping in a secondhand box, rather than rebuilding the existing one, so maybe you should keep your eyes open for a replacement 5-speed auto

Of course if you haven't changed the fluid & filter for a couple of years there's an easy way to improve it...

Nick Froome
www.w124.co.uk

 

[television]

My gearbox works ok but you do feel the changes a little bit more than I think you should but only 2-3 and 3-4, 4-5th is always smooth. 2-3 can be quite jerky at times and very much so when cold and also kickdown is very fierce when used for the first 2-3 times from cold but gets smoother after a few miles.
THe box is very smooth when the car is fully loaded carrying a lot of weight. Is this a sign that the box is in need of rebuilding?

Any help would be great. Thanks!

These boxes can behave like it, and is normal. They stay in lock up longer when cold for rapid warming of the CAT. Some folk say that it can be improved with an oil change, the choice is yours


malcolm

 

[paulb300]

Thanks


The oil and filter have been changed a few hunrdred miles ago without much improvment.

I think if keeping the car a rebuild would be the better route as I would imagine a 2nd hand one could provide the same risk........or worse.

Thanks for the input guys!

 

[television]

I think that you will find that your gearbox is a 4 speed, not 5.
there is one small mod that gives harsh 2-3 changes, that is to replace the K1 spring,an easy job with the sump off. If the vacuam pipe is off or leaking that can give the same effect.

malcolm

 

[Bolide]

5-speed auto

The 5-speed auto is not listed in the March 1990 pricelist. I've sold a 92 300-24 with one so it must have been introduced in 1991/2. You can bet it was expensive!

Nick Froome
www.w124.co.uk

 

[paulb300]

@Television


It is definately a 5 speed auto not 4 speed. The vacuum pipe has been checked and refitted at both ends.
I will ask my local mechanic to see about the K1 spring on Thursday when it goes for the rear spheres sorting out.

@Bolide


THe car is not far from being a 'J' and this was fitted to my car as an expensive option I beleive.

 

[television]

The 5-speed auto is not listed in the March 1990 pricelist. I've sold a 92 300-24 with one so it must have been introduced in 1991/2. You can bet it was expensive!

Nick Froome
www.w124.co.uk

Handy to know that,many people ask when the 5 started, OK found it, the 722.4 was only used up to 01 05 91 when it was then the 722.5.
Please discount the K1 spring as it does not apply to your box.

Malcolm

 

[paulb300]

Ok thanks.

I got a data sheet from Merc today regarding the spec of my car.

On the sheet it says it has the new M111 engine. What does this mean? Thanks!

 

[television]

Ok thanks.

I got a data sheet from Merc today regarding the spec of my car.

On the sheet it says it has the new M111 engine. What does this mean? Thanks!

What that means is that your car has a new model 6 cylider in line engine along with your new 5 speed gear box gearbox, this 111 engine was used up to 06 98 in all quite a nice engine.

Malcolm

 

[paulb300]

Thankyou Malcolm. You are a very knowledgable fellow!



Thinking about the gearbox again.

What oil would my box need. Is it classed as an electronic box and need Dextron 3?


Also reading through the posts does imne have two drain plugs ie. Box + T. Converter?

Thanks again!

 

[Bolide]

If it's a 5-speed it is classed as electronic as there's an ecu to govern 4-5 shifts - and possibly the other shifts, I don't know. I've heard others say that Dextron III does not work well and the MB fluid is the stuff to use

Nick Froome
www.w124.co.uk

 

[television]

If it's a 5-speed it is classed as electronic as there's an ecu to govern 4-5 shifts - and possibly the other shifts, I don't know. I've heard others say that Dextron III does not work well and the MB fluid is the stuff to use

Nick Froome
www.w124.co.uk

Hang on Nick, the 772.5 is not ECU controled, that did not start until the 772.6 box. this box is known as an electrohydraulic control.

Malcolm

 

[paulb300]

Oh dear!


Which do you guys think would be best as I'm not sure what he would have changed it with and want him to do it again if incorrect fluid was used. Cheers

 

[Bolide]

5-speed auto

AFAIK the 5-speed auto used in the W124 uses an ECU to control the 4-5 shift and the 4-speed is totally hydraulic

The 5-speed wasn't offered on the 4-cylinder cars or the diesel

That's as much I know...

Nick Froome
www.w124.co.uk

 

[television]

AFAIK the 5-speed auto used in the W124 uses an ECU to control the 4-5 shift and the 4-speed is totally hydraulic

The 5-speed wasn't offered on the 4-cylinder cars or the diesel

That's as much I know...

Nick Froome
www.w124.co.uk

There is no ECU on a 722.5 gearbox, there are no fault codes for this box When the 722.5 box is used with a 6 cylinder car, it uses 6.2 liters. the correct oil is 001 989 23 03/11 part number 001 989 07 03/11 should not be used now.

Malcolm

 

[Bolide]

So by a process of deduction the 722.5 uses the main ignition/fuelling ecu to control the 4-5 shift?

Nick Froome
www.w124.co.uk

 

[television]

So by a process of deduction the 722.5 uses the main ignition/fuelling ecu to control the 4-5 shift?

Nick Froome
www.w124.co.uk

Hi Nick,Looking at the electrohydraulic valve box, the 5th shift is the same as the other gears, solinoid operated. I do not know if ratio's of the gears have been changed, or if the 5th gear is anything like the overdrive type as on the722.6 box. I was no more aware of this box than you, it did not have a very long life as the 722.6 came along around 94-5.

As you rightly say it was never fitted to the 4 cylinder cars.
If I find any info on how the 5th gear works I will let you know.
Just for the record
the 722.6 was first used on, 129,140,170,202,208 and 210 around 01 95.
the 722.4 was also used on 124,126,129,201,202,210
the 722.5 was used on 124,129,140,210.

If I find anymore I will let you know, Regards Malcolm

 

[big x]

What that means is that your car has a new model 6 cylider in line engine along with your new 5 speed gear box gearbox, this 111 engine was used up to 06 98 in all quite a nice engine.

Malcolm

The M111 is a 4 cylinder
Yours is a M103 six.

adam

 

[paulb300]

I'm glad to stir a little debate on this subject!


Thanks for all your hel guys!!!



M103six ?


All I know is that the mercedes supplied data sheet reads as follows -

Special version codes 199 NEW ENGINE MODEL M111 CVEHS
425 AUTOMATIC TRANSMISSION 5-GEAR

TYPE 300TE - 24