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Slipping auto box - Vito

Discussion in 'Engine' started by Hogie, Oct 11, 2017 at 12:59 PM.

  1. Hogie

    Hogie New Member

    Messages:
    3
    Joined:
    Sep 26, 2017
    Location:
    Surrey
    Car:
    Vito Dualiner 115 CDI
    Hi - forgive my first post here being one asking for technical help but I have been lurking on this site for a while ['reserching' Vito's befor etaking the plunge.
    I have just bought a 2007 115 CDI Vito Dualiner (W639) with automatic transmisson and taken a bit of a punt on it as there is slight transmission slip when changing up from 2nd to 3rd. It all works fine in the othergears and there is no issue going down the gears, only changing up.
    Does anyone have any opinion on likely causes? Vehicle is low mileage 50k and came with no service history so I am assuming the transmission has never been serviced
    David
     
  2. WG M-B

    WG M-B Auhorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    1,892
    Joined:
    May 26, 2011
    Location:
    N/W london
    Car:
    C63 Wagon in black
    First thing to have check fluid condition and level. After that it could be a valvebody problem, or a component in the main transmission power train causing oil pressure loss/ slip. First port of call is fluid and filter. The tech can look for signs of damaged fragments when the sump is removed.
     
    wu56Shoozz and brucemillar like this.
  3. OP
    OP
    Hogie

    Hogie New Member

    Messages:
    3
    Joined:
    Sep 26, 2017
    Location:
    Surrey
    Car:
    Vito Dualiner 115 CDI
    Thaks Wayne. I was wondering if it could be a sticky valvebody as it only happens between 2nd and 3rd. In your opinion, would a fluid and filter service be enough to 'un-stick it or will they need to physically get deeper into the gearbox?
     
  4. Tuercas viejas

    Tuercas viejas Hardcore MB Enthusiast

    Messages:
    364
    Joined:
    Mar 26, 2017
    Location:
    Denver
    Car:
    landrover/rolls royce/MB AMG S600/Prius
    Might I suggest you probably have a lot of contamination of the conductor plate speed sensors and therefore the shift is confusing the TCM d causing the shift delay with some possible flaring conditions.
    The initial remedy is to fully service the transmission unit by a total fluid purge and replacement of the circuit board and filter etc.
    2007 mercedes vito transmission - Google Search:
    The two sensors I mention are seen in the attachment 5n2 5n3 as sticking up round like pillars. One controls initial 1/2 shift, the more f'ward one 2/3 shift (your corrupted culprit )
    Once serviced i always add a can of BG ATF Plus to the genuine MB fluid for a super shift quality and amazing customer perception on shift quality.
    All the best
    Tuercas viejas
     
    wu56Shoozz likes this.
  5. WG M-B

    WG M-B Auhorised Forum Sponsor Authorised Forum Sponsor

    Messages:
    1,892
    Joined:
    May 26, 2011
    Location:
    N/W london
    Car:
    C63 Wagon in black
    No it’s unlikely it would cure a valvebody issue.
     
  6. OP
    OP
    Hogie

    Hogie New Member

    Messages:
    3
    Joined:
    Sep 26, 2017
    Location:
    Surrey
    Car:
    Vito Dualiner 115 CDI
    Wayne -thanks again for the replies.
    Tuercas - the link is really helpful so thank for that and the advice, always good to know what to look for when I get inside!
    David
     
    Tuercas viejas likes this.

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