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Thread: 300TDi, is my head gasket going?

  1. #11
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    Aug 2012
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    Logan,Queensland
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    Quote Originally Posted by Goosey View Post
    Cheers for the replies. I've been having a look and all the water seems to be draining from the expansion tank and into the radiator to the point that the coolant is at the cap. Could this be my water pump has carked it or a blockage in the system? The 'P' gasket is also leaking, could this be the culprit?
    By "CAP" do you mean the radiator plug ?
    '95 Defender 130 Single Cab
    HS2.8 TGV Powered
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    98% of all Land Rovers built are still on the road.
    The other 2% made it home.

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  2. #12
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    Yeah I mean the plug. This is all beyond my expertise so i'm taking it to my mechanic tomorrow before anything bad occurs. Thank you for the info though.

  3. #13
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    Best of luck with it.
    Let us know what they find.
    '95 Defender 130 Single Cab
    HS2.8 TGV Powered
    ------------
    98% of all Land Rovers built are still on the road.
    The other 2% made it home.

    Cost difference between Britpart and Genuine seals: £2.04. Knowing that your brakes won't fail at any moment: Priceless.

  4. #14
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    Feb 2012
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    Took it in today and the head gasket is gone, i'm hoping the head is still straight but we'll see... I know the guy that's doing it and he's given me a good deal so when I get it back in a week lets hope all is good. On a plus I picked up my lift kit today

  5. #15
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    Aug 2009
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    lota, brisbane
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    head gaskets usually go around 250,000 km, get a new head from turners in England way way cheaper than getting it here, also get and engine monitor as this measures the head material temperature and not the water or lack thereof, i have been there done that among the many on this forum

  6. #16
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    I know it`s an old thread but - The TDi300 Disco I`ve just bought has just begun showing similar signs as the OP and it isn't anything obvious to me either - The previous owner very recently replaced the head gasket too so I`m really hoping it`s not that!?

    Initially I thought the water loss was due to the heater matrix leaking because the carpet in the footwell was quite wet -But I eliminated that possibility by using my plumbing skills and disconnecting the rubber hoses at the bulkhead and bypassing the heater matrix completely with a copper U-bend.

    I still think there`s something not quite right though as I`m still topping her up more than is usual and the low water alarm has started to blip on intermittently when I go up any steep hill - Anyway I've just taken it in to my local LR mechanic to be `sniffed out`

    The one thing I will say though is this - When I was topping up the expansion tank using the method previously described it doesn't actually work out that way on the TDi300 Discovery! ie When the water level in the expansion tank is set level with the seam the water level is only just at the top of the radiator bung - This means the thermostat bung still has another 3 to 4" to go before any coolant spills out of that hole.

    This is a pretty silly design I reckon as surely it must mean that the upper water galleries must be running half empty most of the time and also become very prone to air locking - No wonder head gaskets are prone to going on the Disco 300!?

    Be interested to hear if anyone else here has had similar thoughts and even more interested if anyone has come up with a solution?! - BTW Being a plumber I think I might have one!?

  7. #17
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    Druid. There are other methods, but one I use to top up easily - When the reservoir level is at the correct height, put the cap on tightly - the trapped air will stop coolant getting any higher in the tank - then remove the plug in the trermo and top up till its full, squeeze and tap the top hose to get any bubbles out. This should at least allow any spaces to be filled with coolant.

  8. #18
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    Yes, leave expansion tank cap on and just top off through tstat housing. Often a couple of times.

    I dd a no-fault head gasket change at 300k km and the head gasket was in great nick.

  9. #19
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    Dec 2008
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    Righto I`ll remember that next time I top her up

    Just got the call today too that she`s failed the sniffer test - Sounds like something was overlooked a few weeks back then I guess

    The stripdown will reveal all no doubt

    BTW My `plumbers brain thoughts` about improving the cooling system were along these lines.

    https://www.google.com.au/search?q=2...l+kit&imgdii=_

    Simply mount and plumb in a small Boiler Expansion Vessel Kit anywhere you like in the engine bay

    The vessel could be mounted at any height you want because the system would simply become a `sealed system` - This means you could fill the existing expansion tank (and the associated cooling galleries) to the absolute brim and hence virtually eliminate any airlock risks completely.

    The extra water in the system would also aid cooling and if you fitted an inline pressure gauge and drain cock you could monitor the PSi and make coolant changes a doddle.

    I`d probably go for teeing it in on the bottom radiator hose (because that`ll be cooled water from the rad) using a plain copper 20mm tee in to the 3/4" branch pipe.

    To protect against vibration you could come off the moving parts with copper and then just go to a flexi to connect to the air vessel mounted on the car body.

    Whadda ya`reckon?! and should I patent it now

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