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Thread: Left over bolt after replacing head on 300TDI

  1. 13th January 2024, 05:31 PM #1
    Cre Master
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    Left over bolt after replacing head on 300TDI

    Hi all,

    I hope someone can help.

    First time doing anything major on the Discovery 1 300 TDI and I seem to have a bolt left over which is doing my head in.

    It takes a 17mm socket, seems to have a 12mm thread and has a thread length of around 15 mm. It also has a copper washer.

    Would be grateful of any clues.

    Mystery Bolt.jpg
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  2. 13th January 2024, 06:18 PM #2
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    Blknight.aus
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    could be the coolant bolt from the top of the head.
    Dave

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

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  3. 13th January 2024, 07:31 PM #3
    TonyC
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    It's not the sump plug is it?

    Given it's got a copper washer on it I assume it's a drain plug.

    Go over the old head, once you discount the head, manifold and thermostat housing bolts, there can't be many othe options.

    The Disco motor has two sensors in the thermostat housing that the Defender doesn't have, could one of them been blanked off?

    There is a coolant drain on the L/H side of the block, behind the the dip stick tube, but I’m sure it not that big.

    Dave, where's the coolant bolt on the head?

    Tony
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  4. 13th January 2024, 07:58 PM #4
    Cre Master
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    Quote Originally Posted by Blknight.aus View Post
    could be the coolant bolt from the top of the head.
    Thanks for the reply. I've gone and had a look but am a little stumped. Is it under the rocker cover?
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  5. 13th January 2024, 08:02 PM #5
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    no, usually its fitted under the heater pipe about halfway down.

    its not drilled in some aftermarket heads.
    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 autoManual d1 (gave it to the Mupion)
    Archaeoptersix 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.
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  6. 13th January 2024, 08:10 PM #6
    Cre Master
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    Quote Originally Posted by TonyC View Post
    It's not the sump plug is it?

    Given it's got a copper washer on it I assume it's a drain plug.

    Go over the old head, once you discount the head, manifold and thermostat housing bolts, there can't be many othe options.

    The Disco motor has two sensors in the thermostat housing that the Defender doesn't have, could one of them been blanked off?

    There is a coolant drain on the L/H side of the block, behind the the dip stick tube, but I’m sure it not that big.

    Dave, where's the coolant bolt on the head?

    Tony
    Thanks Tony,

    No clues on the old head I'm afraid and the thermostat bolts seem all accounted for.

    The coolant bolt next to the dipstick is there too. See pic.


    coolant bolt.jpg

    The sump holes seem all too big for this sized bolt.

    Cheers
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  7. 13th January 2024, 08:25 PM #7
    Cre Master
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    Quote Originally Posted by Blknight.aus View Post
    no, usually its fitted under the heater pipe about halfway down.

    its not drilled in some aftermarket heads.
    There are two bolt holes on that end of the previous head if that is where you mean, but both are too small to accommodate this particular bolt.

    Head Bolt Holes.jpg

    Thank you for the suggestion though.
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  8. 13th January 2024, 08:41 PM #8
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    on the top of the head. not the back.
    tdi300 head.jpg
    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 autoManual d1 (gave it to the Mupion)
    Archaeoptersix 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.
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  9. 13th January 2024, 09:11 PM #9
    Cre Master
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    Quote Originally Posted by Blknight.aus View Post
    on the top of the head. not the back.
    tdi300 head.jpg
    Got him!

    You are a champion.

    The replacement head was off a rebuild that had other issues and I've obviously missed that bolt when stripping it for the cleanup. I've taken it out and it is identical.

    Bolt below heater rail cropped.jpg

    My alternative was going to be to fill it with coolant and oil and see what started spurting first, but wasn't overly happy at the thought of doing so.

    Big weight off my mind.

    Thanks!

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  10. 13th January 2024, 10:54 PM #10
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    You're definitely in Blknight territory.
    If you don't like trucks, stop buying stuff.
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