Discovery 2: TD5 Head Gasket Again?





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  1. #1
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    Default TD5 Head Gasket Again?

    The Disco (TD5 2003) loses coolant through the expansion tank cap when used on freeway. In town the problem is less obvious and the leakage is minimal.
    Drive to PTA and back from Kempton Park and it loses approx. 1/2lt. it definitely looses the water on the cap as there is coolant around the neck of the bottle and I have run a pipe from the overflow to a small bottle and this catches some water as well.

    What has been done so far.
    1.Headgasket replaced in 2014 (Due to overheating because of low coolant level). Indie checked the head and block and they were OK. Headgasket had corroded at one point and this is where it blew. Head was overhauled" at the same time and thermostat and temp sender replaced as precaution.
    2.Radiator and viscous replaced a few weeks before as one fan blade caught on the cowling and shattered sending shrapnel through the radiator core.
    3. In December I replaced the Expansion tank and cap as it was leaking from a aftermarket coolant sensor fitted on the side of the tank. (This in my quest to find the leak)
    4. Noticed the radiator hoses looked öld"so replaced all of them as well.
    5. 2 Days later the water pump started leaking so this was also replaced. (Probably the pressure in the system finding the next weak spot)
    6. Took Disco to Silverton for a HC test and no problem found. (Gas Test)

    My suspicion is that the system is pressurised from engine side at load and this cauases the overflow of coolant.
    Engine starts easy (Very easy in fact) and does not miss-fire or show signs of power loss.

    Is there another way of checking to see if the head gasket is faulty?
    Could air trapped in the system somewhere also cause this.
    System was bled after each part replacement.

    BTW: The antifreeze I am using is Engen's yellow "Multicool" range. Is this OK.
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
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  2. #2
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    Default

    1) gas test on a diesel is seldom conclusive - typically gas pushes past headgasket under load which cannot be simulated revving her while stationary

    2) Td5 has metal headgasket which very seldom "blows" - it tends to leak past under load which makes assessing difficult

    only way to conclusively determine whether the headgasket is leaking is to lift the head

    the problem is however that typically gas from the cylinder forces its way past the headgasket at up to around 22 bar into the water jacket pressurising the water system which leads to blow-off. there is no easy way to simulate this.

    Land Rovers never die, they simply become organ donors!

  3. #3
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    Default

    LL what parts would be required to do this.
    1. Headgasket (Check Holes)
    2. Head bolts,
    other gaskets?
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
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  4. #4
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    What is the typical charge for replacing head gasket all parts included?
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
    BMW GS 1200 Adventure. For when the road ends...
    Jurgens XT120..home away from home.

  5. #5
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    Default

    Hi,

    I did mine myself last year.
    Head was very lightly skimed and pressure tested. R750.00 JB Engeneering
    Head Bolts R750.00 Victor Reinz
    Head Gasket R550.00 Victor Reinz
    Head Gasket set R750.00 Victor Reinz
    New oil, Filter, Antifreeze etc R800.00
    At the same time I replaced the Injection harness and Injector washers at cost of approx R1000.00.

    That's more or less that.

    Not a very big job but a meticulous one.
    I enjoyed it.

    Cheers
    '03 Discovery II GS TD5

  6. #6
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    Default Re: TD5 Head Gasket Again?

    Cannot believe this.... Gasket done March last year. And....yes you guessed.... Pressure in coolant system again. Pipes are rock hard when running and if you open the cap in the morning, when cold, pressure escapes......
    16 Months and 15K km's later.

    O and did I mention R15000 later....
    Last edited by Tsotsi; 2017/07/26 at 09:39 AM.
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
    BMW GS 1200 Adventure. For when the road ends...
    Jurgens XT120..home away from home.

  7. #7
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    Default Re: TD5 Head Gasket Again?

    I hate to say it, but is the head not cracked on the water jacket side?

    Also, if head was made true/flat, was the block also checked that it was flat?

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  9. #8
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    Default Re: TD5 Head Gasket Again?

    Are you 100 percent sure your head is good?

  10. #9
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    Default Re: TD5 Head Gasket Again?

    We must ask who did the gasket the last time? Was it a proper Landy independent?

    The tightening sequence on the TD5 is bloody critical and needs special care.

    http://workshop-manuals.com/landrove...head/page_206/

    also, the bolts usually CANNOT be re-used, you MUST use new bolts EVERY TIME

    This has been discussed multiple times on this forum and others.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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    Default Re: TD5 Head Gasket Again?

    Quote Originally Posted by jelo View Post
    We must ask who did the gasket the last time? Was it a proper Landy independent?

    The tightening sequence on the TD5 is bloody critical and needs special care.

    http://workshop-manuals.com/landrove...head/page_206/

    also, the bolts usually CANNOT be re-used, you MUST use new bolts EVERY TIME

    This has been discussed multiple times on this forum and others.
    also need to confirm if head was indeed skimmed?
    too many guys clean and throw a head gasket on and hope for the best

    Land Rovers never die, they simply become organ donors!

  12. #11
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    Default Re: TD5 Head Gasket Again?

    Head was done by well known Indie. Head was tested at engineering shop. Indie checked block as well and all was found 100%.

    Had no overheating problems and in the couple of months it ran good, used about 1x cup of water couple of days after repair and since then nothing.

    Mystery as to why it would be perfect for 15K km's and then suddenly push pressure. Currently the disco starts 1 st turn and runs smooth.
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
    BMW GS 1200 Adventure. For when the road ends...
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  14. #12
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    Default Re: TD5 Head Gasket Again?

    Quote Originally Posted by jelo View Post
    We must ask who did the gasket the last time? Was it a proper Landy independent?

    The tightening sequence on the TD5 is bloody critical and needs special care.

    http://workshop-manuals.com/landrove...head/page_206/

    also, the bolts usually CANNOT be re-used, you MUST use new bolts EVERY TIME

    This has been discussed multiple times on this forum and others.
    See the invoice shows new bolts, thermostat, Fan Belt, Manifold skim and leak down test (Head)
    Damn those bolts are expensive..
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
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    Default Re: TD5 Head Gasket Again?

    Quote Originally Posted by Kingswood View Post
    Hi,

    I did mine myself last year.
    Head was very lightly skimed and pressure tested. R750.00 JB Engeneering
    Head Bolts R750.00 Victor Reinz
    Head Gasket R550.00 Victor Reinz
    Head Gasket set R750.00 Victor Reinz
    New oil, Filter, Antifreeze etc R800.00
    At the same time I replaced the Injection harness and Injector washers at cost of approx R1000.00.

    That's more or less that.

    Not a very big job but a meticulous one.
    I enjoyed it.

    Cheers
    These prices are halve of what mine was. Were did you source from?
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
    BMW GS 1200 Adventure. For when the road ends...
    Jurgens XT120..home away from home.

  16. #14
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    Default Re: TD5 Head Gasket Again?

    So this afternoon Swambo returns from town with the Disco and I notice cooland dripping behind drivers front wheel. Yup you guessed it... coolant pushing out the expansion tank. Open breather on top rad hose and wshhhhhh.... lots of air...
    .................................................. ......
    Gary Walker


    Discovery 2 (Td5) Best 4x4xfar
    BMW GS 1200 Adventure. For when the road ends...
    Jurgens XT120..home away from home.

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    Default Re: TD5 Head Gasket Again?

    Quote Originally Posted by Tsotsi View Post
    So this afternoon Swambo returns from town with the Disco and I notice cooland dripping behind drivers front wheel. Yup you guessed it... coolant pushing out the expansion tank. Open breather on top rad hose and wshhhhhh.... lots of air...

    Check for bubbles in expansion tank. It might be the tank cap that is not releasing air as it should as well. Replace that first.

    Regards,
    Suid-Wes
    2006 Defender 110 Td5

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  19. #16
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    Default Re: TD5 Head Gasket Again?

    Just a couple of related questions, if you don't mind.

    From what I understand the Td5 coolant system, under normal conditions,
    is
    under slight pressure.

    That means that if you open the expansion tank when hot, it will make a small "woosh". Is this correct?

    If you open it when cold there should be no "woosh"?

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  21. #17
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    Default Re: TD5 Head Gasket Again?

    Most modern cooling systems are pressurised, so a slight hiss is to be expected, but with a potentially blown head, the water is displaced out the system by the gases leaking into the cooling system and this leads to a LOT of air being released, as well as the hoses becoming very hard under running conditions due to the higher pressure the gases exert than standard.
    Cheers,
    John Kilfoil

    Rover P6
    Land Rover Discovery II Td5 Manual
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  23. #18
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    Default Re: TD5 Head Gasket Again?

    Before ordering a new head gasket have the engineering shop check the piston protrusion. Maybe the gasket is the incorrect one...

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  25. #19
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    Default Re: TD5 Head Gasket Again?

    I had this done by an Indie in 2014 and it was fine for about 14 months. Noticed air in the system and had it checked by another Indie who confirmed head gasket problem. Head was checked and gasket replaced. Was OK since March 2016. Last couple of weeks I noticed air escaping when opening cap. even in the morning when engine is cold. Hoses are also very hard again when hot, especially after traveling on the freeway.

    In the last 2 years I have replaced all the coolant hoses, Expansion bottle and cap.

    Saturday she was pushing coolant past the cap when Swambo got home. Opened the bleeder valve on top hose and had air blowing out for about 1 minute then followed by coolant.

    Can one smear the gasket with Indian Head Shellac or spray with CoperTac when fitting? Will this help?
    .................................................. ......
    Gary Walker


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    Jurgens XT120..home away from home.

  26. #20
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    Default Re: TD5 Head Gasket Again?

    the early TD5 had head dowel issues and the head would eventually shift

    which engine do you have? 10P?
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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