W124 300TD - idle surge/hunting. Delivery valve seals at fault?

Discussion in 'Engine' started by Ed209, Oct 12, 2015.

  1. Ed209

    Ed209 Member

    Messages:
    53
    Joined:
    Sep 27, 2009
    Location:
    South Croydon
    Car:
    W124 300TD
    Hi all,

    The old girl has started hunting at idle. I've had a weep at the delivery valve seals for a while now, that I've never got around to fixing. Could this be the culprit?

    If so, can anyone recommend an online supplier for the o-rings and copper washers please?

    Thanks
     
  2. OP
    OP
    Ed209

    Ed209 Member

    Messages:
    53
    Joined:
    Sep 27, 2009
    Location:
    South Croydon
    Car:
    W124 300TD
    Well I've replaced the leaking delivery valve seals, and although it went successfully, it has not cured the idle hunting.

    Can anyone offer any ideas?
     
  3. trapperjohn

    trapperjohn MB Club Veteran

    Messages:
    7,316
    Joined:
    Nov 19, 2008
    Location:
    Lancashire
    Car:
    124 300D 24V Estate
    Sorry no. Never heard of a diesel "hunting" My diesel does have a small air leak on start up and fires on 5 only. (I call this "eco" mode) It then settles down and is smooth as a button all day long, but still air is travelling through the system even when it is running smoothly.
     
  4. SilverSaloon

    SilverSaloon MB Club Veteran

    Messages:
    7,759
    Joined:
    Mar 16, 2004
    Car:
    1994 W124 E300D Estate, 1985 R107 280SL
    make sure the fuel lines are not leaking in too much air - look for bubbles in the clear lines.

    does this continue to occur when the engine is up to temperature?
     
  5. bolide

    bolide Hardcore MB Enthusiast

    Messages:
    3,726
    Joined:
    Oct 8, 2005
    Location:
    Brighton
    Car:
    BMW E39 525 Diesel Touring
    This is a 603-engined car? 300TD? Or an E300 Diesel?

    Nick Froome
     
  6. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

    Messages:
    3,923
    Joined:
    May 11, 2011
    Location:
    Buckinghamshire, yuppie central 1985.
    Car:
    96 e300d, 88 w124 superturbodiesel, 90 bmw E30 v8, + "others"
    +1:thumb:
     

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