Viano 722.6 Slipping and Vibrating

Arudge

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A basic idea of the torque converter lockup function.

7226torqueconverterlockupfunction.jpg
 

Arudge

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Arudge, that's as I expected. well similar response anyway.
Of course if the same box went in to so many vehicles picking up a good 'un at a reasonable price would be easy.
Thanks again, now I know that I need to be specific with a search or get this one refurbed, that's probably favourite after a Star check confirms what seems reasonable to expect.
The problem here is the loss of your vehicle for what could be a couple of weeks whilst you refurb the transmission, whether you pull it apart yourself or send it in.

With the vehicle on ramps it takes 3-4 hours to remove the transmission. It's not complicated but it is a bit long winded. If you think you can scuttle underneath and just pull it out, then bear in mind this unit weighs 80kg. i've seen it done without ramps but it's very hard work and will take you all day.

On the other hand...

http://www.aaagearboxes.co.uk/gearbox.html

Open up the Mercedes tab and yours is second from the bottom.
 
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M80

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Aye, I've done the scuttle thing on the Vito to replace the TC. It wasn't a great pleasure. The g'box was manageable with jacks ++, but awkward.

Nottingham isn't too far so this company may well suit purpose. I'm not over keen to spend that sort of dosh but if that's the answer then I'll justify it with the future years of pleasurable motoring.
 

Arudge

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At least you know what's coming. Mercs, you start swearing by them and end up swearing at them. I believe they call it character building. Mmmm.
 
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Latest update.
I rang AAA Auto Boxes, they don't have ramps for an Exl Viano and gave me details for Eddie Rose in Mansfield.
I drove over there this morning, the cruising symptoms were much better on the drive and I only experienced the vibes once, and that was less pronounced than previous. The return journey and there were no vibes.
The pull away revs were the same.

Eddie plugged in his diagnostic kit and could see loads of historical faults that aren't apparent in the motor, a different issue.
The TCU checked out ok and the adaptation fill times according to Eddie were good, one reading of -60 was low he said but truth is I haven't a clue what that means.
He road tested the motor and felt all was as it should be, the pull away high revs are to be expected in his opinion. I wasn't used to that in the Vito but hey ho.
The vibes, as expected, will have been from the TC. So it looks like the ATF change has or is continuing to resolve that.

So there isn't a rush for my next move as the new ATF is doing well and possibly continuing to clean the old fluid. So before long I'll replace the fluid with 6 litres minimum this time, filter, gaskets and 'o' rings and hope to be able to relax and enjoy sorting the other little jobs on the Viano.

Thanks to all for your input, fingers crossed that we've got there with this and I feel I understand a little more of the mystery of the auto box.
 
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Arudge

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Thanks for the update, always appreciated.
 
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I'm preparing to do the ATF service, a full one this time. Still waiting on the imminent delivery of parts.
How many miles driving, in these lower temperatures, does it take to warm the ATF through for a more effective evacuation?

I'll be splitting the after cooler pipe to flush through, I've 7 litres of 134 coming, but want to be rid of as much of the old as I can.

I've read that there is no need to replace the sump bolts. With such a low torque applied I can see that they wouldn't be stretch bolts anyway, true?
 
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LostKiwi

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I've read that there is no need to replace the sump bolts. With such a low torque applied I can see that they would be stretch bolts anyway, true?
If they were stretch bolts you'd have to replace them.
 
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Thanks LK, I see my 'would' should have been wouldn't (be stretch bolts). Well I wouldn't have thought so anyway.
Most eBay service kits, from MB dealers, don't include the bolts. Perth do. So I was just looking for clarification really.

And as my iCarsoft doesn't read out ATF temperature, How long to warm it through?
 

alexanderfoti

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I would suggest, as others, that the issue is with the TC, or the TC actuation solenoid etc.

Slipping in the box is hidden by auto adaption until the fill times go past 10-11 (max is 15). After you go past max fill time then the box will flare between changes. If you are feeling slipping when pulling off gently its almost certainly in the TC side. The box will go into limp mode if it detects too much slippage.

I would do the following:

Send off valve body for testing and replacement of faulty tc solenoid, shimming of tc piston bore
Send off TC to Jpat for them to rebuild.
Reset adaptions after doing all this.
 

LostKiwi

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And as my iCarsoft doesn't read out ATF temperature, How long to warm it through?
Pretty hard to say but I'd expect it would be warm enough after 10-15 miles. You can 'force' heat into the transmission by holding it on brakes and increasing the engine speed (called a stall test) but its not recommended to do that more than 5 seconds at a time to prevent excessive localised heat build up.
https://www.freeasestudyguides.com/torque-converter-stall-test.html
 

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