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Thread: 2007 BXE with coolant loss

  1. #1
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    2007 BXE with coolant loss

    Workmate of mine has a 2007 Touran which his partner mostly uses. It has the 1.9TDI engine, code BXE. 150000 miles on the clock.
    It sometimes overheats, and loses coolant, though seemingly only when worked hard. Day to day pootling around town and commuting to work it loses nothing, nor overheats. Water pump and timing belt were replaced this year, and thermostat replaced with genuine item too. Fans on the rad work as they should.

    He decided recently to get it fixed, and bravely handed it over to the local VW dealership saying 'please fix it', knowing that a substantial bill was on the way, (expecting HG replacement).
    They sent him a report later saying they'd pressure tested the cooling system and found no fault. He took it away again to ponder.

    My feeling is that the fault is likely to be 'head lift' where the fire-rings temporarily fail to seal completely when the engine is under heavy load, letting combustion gases into the coolant, and maybe vice-versa.

    Is this situation familiar to any members here?
    Is there the slightest chance that replacing the headbolts with the PD150 (stronger) versions (one by one, to minimise the work involved) can improve or resolve this problem?

    Thanks for any thoughts,

    Pete
    Last edited by Pete1; 03-12-18 at 11:31. Reason: added mileage, and more details
    My car: 2003 Polo 1.4 BBY, Petrol
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  2. #2
    Administrator Keithuk's Avatar
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    As you know TDI-PD engine do suffer with head gasket failure. Fitting stronger head bolts shouldn't fix the problem as the standard ones should be ok.

    Manufacturer: VW, Date(s) Used: 06/2005-05/2010, Model: Touran, Engine Code: BXE, 77Kw, 105PS, 1.9 Ltr, 4 Cyls, Remarks: Turbocharged Direct Injection Pumpe Düse (TDI-PD), 8v Timing belt
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


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    I don't know much at all about diesels, unfortunately, but thanks.
    My car: 2003 Polo 1.4 BBY, Petrol
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  4. #4
    Senior Member Gazwould's Avatar
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    The BXE has a rare but possible exploding leg out of bed job .

    The upper conrod bearing wears through and spot welds to the crank .

    No warning just B A N G !

  5. #5
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    I'm not sure that I'll pass on that knowledge, but yes, Ive read the same!

  6. #6
    Administrator Keithuk's Avatar
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    If you want to know about VAG TDI browse https://www.myturbodiesel.com/ or search TDI Wiki for head gasket problems or any problems.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  7. #7
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    Thanks again Keith.

    Anyone here had head lift and fixed it?
    My car: 2003 Polo 1.4 BBY, Petrol
    Good Lady's: 2005 Mk1 Skoda Fabia 1.2, AZQ

  8. #8
    Administrator Crasher's Avatar
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    As said, the 8v PD is prone to head gasket failure which tends to only manifest itself when driven hard, such as on motorways. The only permanent cure is a new cylinder head as the leak is caused by the failure of the Hot Isostatic Pressing (HIP) heat treatment applied to the head to reduce porosity of the aluminium surface. VW strictly forbid skimming the head as it removes the treatment and most engineers apply a finish which is too high (rough) or even too low (smooth) a Roughness Average (Ra), it MUST be between 20 and 30 Ra, not only that, the Ra of the block has to be taken into account and not made too smooth when cleaning up for rebuilding and the typical Ra of the block surface is 60, the Metal Layer Shim (MLS) gasket from a typical VAG supplier such as Elring needs this finish to bite into the gaskets outer coating and not slide around BUT not so rough that the gaskets coating cannot seal the channels of the finish. Even IF the required Ra is achieved, the head surface must undergo re HIP treatment or it will fail again within a couple of years. As Gaz mentions, if you put this much effort into a leggy BXE, for God’s sake get the con rod bearings changed. As far as head bolts go, we routinely use the 038 103 384 C ARL head bolt on all 8v PD’s but they won’t fix a blown gasket.
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    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

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  10. #9
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    Very helpful Crasher, thanks very much.
    My car: 2003 Polo 1.4 BBY, Petrol
    Good Lady's: 2005 Mk1 Skoda Fabia 1.2, AZQ

  11. #10
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    "the leak is caused by the failure of the Hot Isostatic Pressing (HIP) heat treatment applied to the head to reduce porosity of the aluminium surface"

    Every day is a school day.
    My car: 2003 Polo 1.4 BBY, Petrol
    Good Lady's: 2005 Mk1 Skoda Fabia 1.2, AZQ

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