W210 Gearbox, changing down from 5th to 4th under load over 70mph

Discussion in 'Engine' started by stuboy, Dec 4, 2019.

  1. stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Hi Chaps, my W210 has just developed a fault where if i put to much load on the engine the gearbox changes gear from 5th to 4th. This is new, its consistent, and it will not then change back into 5th. I have to slow down and take the load right off then eventually it will change back into 5th. It ignores me trying to change with the tiptronic too, it will change down but not back up.
    I had the battery disconnected to do some welding on it the previous week, do u think i should try a gearbox reset?
    Any other thoughts?
    Regards
    Stuart
     
  2. bob6600

    bob6600 MB Club Veteran

    Messages:
    5,576
    Joined:
    Jan 3, 2013
    Car:
    AUDI S8 V10, S210 E320 CDI (R.I.P.)
    Firstly, you should read and then clear any codes, see which ones come back. Ideally on a decent diagnostic system, STAR if possible. If the gearbox oil hasn't been changed in the last 40k miles, get it done.
     
    Flackadder likes this.
  3. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Gearbox oil never changed its done 150,000 miles, could it be low do you think?
    Can you recommend a dip stick for it or do i have to take it to Mercedes?
    I can get it on my mates ramps tomorrow is there anything i can do without a dip stick?
     
  4. Larkone

    Larkone Hardcore MB Enthusiast

    Messages:
    517
    Joined:
    Jun 13, 2016
    Location:
    Essex
    Car:
    2008 CLS 320 CDI facelift
    :eek::eek::eek: Not just possibly low but the oil which provides cooling, lubrication and drive will be completely knackered. Just changing the gearbox oil will make a real difference to how it drives even if it doesn't fix your current problem.
     
    Flackadder likes this.
  5. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Also could you recommend dipstick, oil and filter, i think it will be worth changing it and see what happens. Should i do filter or could i just change the oil? My Transmission is a 722618 02 652963 so that's a 722.6?
    Stuart
     
  6. bob6600

    bob6600 MB Club Veteran

    Messages:
    5,576
    Joined:
    Jan 3, 2013
    Car:
    AUDI S8 V10, S210 E320 CDI (R.I.P.)
    Last edited: Dec 4, 2019
  7. Trickythemerc

    Trickythemerc Hardcore MB Enthusiast

    Messages:
    1,021
    Joined:
    Feb 1, 2015
    Location:
    South Manchester
    Car:
    CLK 220 CDI Sport 2009
    I have a sealey dipstick for sale PM me
     
  8. DrNick

    DrNick Hardcore MB Enthusiast

    Messages:
    503
    Joined:
    Nov 25, 2003
    When mine started doing this,it wasn't the gearbox, it was the engine. A lack of power was causing the box to go for a differnt gear to compensate.
    In my case it was an inlet airleak upsetting the mixture. Fixed that and the gearbox went back to normal.
    Done any work on the engine recently?
     
  9. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Nope not on the engine, i recently fixed the exhaust havn't touched the engine since last filter change
     
  10. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Just to update on driving it today, had to pick some people up and as i didn't get over 60 the gearbox was smooth. The only time it seemed to rev a little high was going up a hill, but there were 3 of us in it. I am hoping its just run low?
     
  11. DrNick

    DrNick Hardcore MB Enthusiast

    Messages:
    503
    Joined:
    Nov 25, 2003
    My W210 had two issues like this.
    The first was as above, when an airleak dropped the power output, leading to the gearbox looking for more torque. This leads to higher revving for a given load, or the box changing down at lower loads than before.
    The other which lead to severe flaring (engine revving like mad but not much acceleration) was due to low gearbox oil, traced to a piinhole leak in the ATF pipes. This made itself obvious with oil sitting in the plastic shield below/near the radiator in my case. This was caused by corrosion on the pipe rusting through from the outside - not an uncommon issue if I recall correctly. Obviously the hole gets bigger over time!
    I suppose the point is, if the fluid is low, then there will be a reason for it, and that will be a leak. But if the fluid is ok then it might be a power problem.
     
    a111r likes this.
  12. Petrol Pete

    Petrol Pete Hardcore MB Enthusiast

    Messages:
    3,032
    Joined:
    Nov 11, 2016
    Location:
    Petrol stations ...everywhere
    Car:
    C55 AMG Wagon
    Not changed for 150K miles ?? don't bother measuring the level just get the gearbox serviced tomorrow.
     
    Flackadder and mikrt like this.
  13. spike60

    spike60 Hardcore MB Enthusiast

    Messages:
    287
    Joined:
    Dec 31, 2011
    Location:
    It's grim oop North!
    Car:
    500 SEC, E320 cdi estate, BMW Z3 2.8, Porsche 944 2.7
    The symptoms you describe are very similar to my w208 CLK 320 some years ago. A gearbox oil and filter cured it.
     
    stuboy likes this.
  14. BobHUK

    BobHUK Member

    Messages:
    54
    Joined:
    Apr 30, 2017
    Location:
    South Hertfordshire
    Car:
    Mercedes E 220 diesel estate
    Hello,

    I have a question regarding the dipstick length for the W210. On Ebay there are several different lengths quoted for 722.6 dipsticks. Some are listed as 920mm long, some are 1200mm, some at 1220mm, and others at 46" or 48" long. So which is the correct one for a W210 automatic box? The reason I ask is that I've noticed some oil sitting in the under engine plastic tray recently, just as NrNick described above. So now I'm worried that my auto box may be leaking.
     
  15. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    From what i can gather either will do as the 1200mm doesn't go all the way in so dont push it too far!
     
  16. OP
    OP
    stuboy

    stuboy Member

    Messages:
    40
    Joined:
    Nov 3, 2006
    Location:
    West London
    Car:
    E320 Avantgarde Estate W210 Petrol
    Is the kit for a 2001 estate the same as a saloon does anyone know? want to get the correct one ordered! Most on ebay have them for the saloon but dont mention the estate. I realise I should do a full change as per this video:-



    for which i will need 11L of fluid. Will a filter and partial change keep me on the road for another 6 months (5L or 7L) or could i just do a top up if that is all i need? Apart from the changing down the rest of the shifts are still silky smooth and changing it might make things worse?
    A dilemma
    Would love your opinions.
    Regards
     
  17. bob6600

    bob6600 MB Club Veteran

    Messages:
    5,576
    Joined:
    Jan 3, 2013
    Car:
    AUDI S8 V10, S210 E320 CDI (R.I.P.)
    Saloon and estate are the same. Change as much oil as you can. If you don't want to flush out the TC then at least drain what you can for now and refill, don't just top it up. Have a look here

    HOW TO: change the automatic gerbox oil and flush on a 722.6 'box

    Yep, they will all 'work' as they will all stick out of the top.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.