722.6 occasional loss of drive?

[Nick66]

On my 2000 E240 very occasionally I lose drive , mostly when I stop for traffic light.It usually comes back after few seconds,if not restart is needed.It has 130k,I had it for the last 3 years and 20k and do not know service history.Very,very occasionally also gets stuck in what I think is second gear,then restart is needed.I am about to change gearbox oil and contact plate,but wonder if anybody has any ideas...Thanks

 

[LostKiwi]

Fluid levels for loss of drive is common fix.
No harm at all in changing oil, filter and conductor plate. Be careful not to bend pins reassembling it.

 

[Nick66]

I happened to have the whole unit,whatever is called one where plate and solenoids etc are in, with new contact plate and one new solenoid inside,from my scrapped E320.I was thinking of just swapping the whole box and change oil,filter and pilot bushing thingy.I am not sure if draining all of the oil through banjo is something I am capable of doing,so I might just change oil without draining the converter.Thanks Kiwi.

 

[Nick66]

Just to make sure,are you referring to the pins on pilot bushing?

 

[LostKiwi]

Just to make sure,are you referring to the pins on pilot bushing?

Correct.

 

[Nick66]

Ok,thanks a lot

 

[pgh13]

You

I happened to have the whole unit,whatever is called one where plate and solenoids etc are in, with new contact plate and one new solenoid inside,from my scrapped E320.I was thinking of just swapping the whole box and change oil,filter and pilot bushing thingy.I am not sure if draining all of the oil through banjo is something I am capable of doing,so I might just change oil without draining the converter.Thanks Kiwi.

You can do a more complete change by disconnecting the return from the cooler..... Pump 2l, top up 2l. Repeat 3 times until fluid looks clean

 

[Nick66]

Thanks

 

[Nick66]

Today I drained the oil and removed the valve body and swapped it with the one I kept from my scrapped 98 E320 since that one had new sensor plate and new solenoid.I do hope the valve bodies are interchangeable.I ran into problem trying to install pilot bushing,I just can not get it screwed in,neither the new pilot bushing,nor the old one.To make the things worse I could not get either pilot bushing installed on the original valve body on the bench,unless I pushed the lower o-ring over the indentation where is clearly supposed to sit,further up towards the bigger o-ring.Is it possible that little nut on the plate is stripped on both valve bodies/speed sensor plates?If anybody has any ideas I am all ears...

 

[pgh13]

When I did mine it needed a good push but did go on ok. Make sure you have the pins lined up with the holes in the bush, and that one or more pins haven't bent, stopping it from fitting properly. Also, lubricate the o rings with ATF.

 

[Nick66]

Thanks,I will try again today and report back

 

[Nick66]

What would be the quantity of ATF oil needed ,I did not drain TC,just replaced the valve body?

 

[Nick66]

Finally managed to get pilot bushing to click in place,needed surprising amount of force...ugh , let's see what other trouble awaits...

 

[LostKiwi]

Being a 722.6 probably around 5 litres but get a transmission dipstick and measure it properly.

 

[Nick66]

Is it 5 liters even without draining the TC?,i am trying to Google it with my greasy fingers,but I seem to remembered lower figure from previous googling?

 

[Nick66]

I don't want to overfill it,figuring it will be easier to add a little bit when I warm up to oil then to drain it...

 

[Nick66]

Managed to put it all back together and filled with about 3.75 liters of ATF.Started the car and went through the gears while stationary,all seems ok,moved the car few inches and so far so good, surprisingly.We will see...

 

[Nick66]

Drove few hundred yards,subjectivly feels better and smoother,going for 50 miles trio in the evening,will try to measure the level then.I was not able to accurately measure ammount of ATF drained out,but my estimate is only about 3.5 liters or less,put in 3.75 lit...

 

[LostKiwi]

Get a transmission dipstick and stop guessing.

 

[Nick66]

Lol,that is the idea,just hoping to get it to temperature,thanks