Page 4 of 4 FirstFirst ... 234
Results 31 to 38 of 38

Thread: Puzzling behavior 300tdi

  1. #31
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,738
    Quote Originally Posted by incisor View Post
    i was interested in seeing if bubbles showed up in the header tank if no valve was present

    thanks for the info...

    what were the systems he experienced, do you know ?
    Low coolant alarm intermittently going off, and losing a little coolant I think.
    The line from the t/stat bleed was blocked.
    Put in a brass tee as a temporary measure and still the same but he had the same issue with his D1 years ago doing the same.
    Used the brass tee and still the same.
    Used the correct bit, problem solved.

  2. #32
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,738
    And best to ask Mario directly but Matt deals with him and Mario said the ones he was getting were faulty too often so Matt is getting genuine.

  3. #33
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,738
    Quote Originally Posted by loanrangie View Post
    I don't know, i replaced mine about a year before i did a head and never had any issues before or after.
    There are no valves or moving parts in them so effectively just a Y joiner anyway.
    I know, maybe read Arthurs post above?
    All I can think of is that the angles need to be right to pull the air out of both bleeds.

    Matt's a switched on mechanic and has tried both, only the genuine bit stopped the overheating.

  4. #34
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    2,493
    Quote Originally Posted by loanrangie View Post
    ....
    There are no valves or moving parts in them so effectively just a Y joiner anyway.
    Yes and No(kind'a sort'a)

    I just fetched mine(the unused one I ordered ages ago).
    Brand new still, just dusty(fell into a small gap between loads of stuff, and sat there all this time).
    Cleaned off hose ends, and blew through.
    From the engine side when you blow air through, most of that air comes through to the expansion tank hose end, and very little to the radiator hose end .. so it is more restricted in the UFO valve thing.
    If you block the expansion tank hose end, its then a little harder to to blow through the engine side end hose, and not as much air comes through the radiator end of the hose(not as much air out, as the effort to blow through).
    Block the radiator hose end tho, and it's much easier to maintain air into hose, and more air(by sound) seems to come out through to the expansion tank hose end.

    radiator hose is smaller ID compared to the other two hose IDs tho .. so maybe that's why the restriction, but it's not a lot smaller(maybe 4mm ID vs 5mm IDs for the other two).

    So, yeah, it's just a three way junction, but it is 'restricted' in some way/somehow, even tho it's still flows all the time through all 3 hose ends.
    Cheers,
    Arthur.

    '99 D1 300 Tdi Auto

  5. #35
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    25,091
    its a double venturi.

    flow from the engine side or the radiator side towards the header tank draws air from the radiator or engine respectively.

    This is why the piece of vac tube flared into A Tpiece works so well.

    Some of the vactuators have a pair of bumper type one way valves in them to stop coolant flowing backwards out of the header tank into the radiator or the thermostat housing.

    a Y piece will usually work if you get it so the Y points down away from the thermostat and radiator but is still higher than the radiator bleed, lower than thermostat and without any downhill legs
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    TDI D1(parting/ed)
    Tdi autoManual d1 (Kept it for the girlfriend)
    Archaeopteryx 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  6. #36
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    2,493
    Quote Originally Posted by Blknight.aus View Post
    ....

    a Y piece will usually work if you get it so the Y points down away from the thermostat and radiator but is still higher than the radiator bleed, lower than thermostat and without any downhill legs
    Ah! makes sense now .. and why a T piece didn't work well for me(until I fitted the inner tube part).

    The flow from thermostat housing and radiator into the expansion tank coming from both the top of the Y bits flowing more smoothly into the expansion tank.
    Hard for the flow to do a sharp almost U turn from one top port and back to the other, but still flow smoothly towards the expansion tank.
    Cheers,
    Arthur.

    '99 D1 300 Tdi Auto

  7. #37
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    13,106
    I just cut the crimps off the hose and fitted the Y fitting with clamps and had no problems after.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  8. #38
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,738
    Quote Originally Posted by Blknight.aus View Post
    its a double venturi.

    flow from the engine side or the radiator side towards the header tank draws air from the radiator or engine respectively.

    This is why the piece of vac tube flared into A Tpiece works so well.

    Some of the vactuators have a pair of bumper type one way valves in them to stop coolant flowing backwards out of the header tank into the radiator or the thermostat housing.

    a Y piece will usually work if you get it so the Y points down away from the thermostat and radiator but is still higher than the radiator bleed, lower than thermostat and without any downhill legs

    Cheers Dave, guessed it had to be a venturi of some description

Page 4 of 4 FirstFirst ... 234

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!