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Thread: Stuck Glow plugs

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    Default Stuck Glow plugs

    Been trying to change the glow plugs on my 150 diesel. Slackened them all off with a 9mm socket but only number 3 will acutally come out - its like the others are trapped inside the cylinder head.
    The engine is still warm, so is this the cause of them being seeming trapped or is there something else?

    How can I get them out?!?!

  2. #2
    Regular Member lee gsi's Avatar
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    Year : 2005

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    Engine warm is good.

    Do they turn at all?

    Give them (And keep giving them) a soaking of penetrating fluid.

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    Quote Originally Posted by lee gsi View Post
    Engine warm is good.

    Do they turn at all?

    Give them (And keep giving them) a soaking of penetrating fluid.
    I've managed to get 1, 2 and 3 out and changed them now. 4 turns until the thread is fully exposed but it just wont come out at all. I can see that there is nothing apparently holding it in so just about to result to brute strength to pull the blighter out. Soaked it in penetrating oil but it wont shift it once the thread is totally loosened off. Stupid thing!!

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    I've managed to get 1, 2 and 3 out now and replaced them. 4 still wont release itself after I've completely undone it. Doused it it penetrating spray and left it for tonight. Will have another go tomorrow morning in work, but what else can I do to get the blighter out? Don't want to end up paying half hours labour for 1 glow plug!

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    Regular Member C-Owner's Avatar
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    Quote Originally Posted by signum_1.9 View Post
    I've managed to get 1, 2 and 3 out now and replaced them. 4 still wont release itself after I've completely undone it. Doused it it penetrating spray and left it for tonight. Will have another go tomorrow morning in work, but what else can I do to get the blighter out? Don't want to end up paying half hours labour for 1 glow plug!
    Cover the glow plug area with a protective mat / towel / blanket.

    Crank the engine to see if it pop's out under compression, but dont run the engine.

    Be careful though please.

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    Vehicle : Vectra C Estate

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    Year : 2006

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    Not the best way or recommended way to get it out but as long as the threads are clear and you have some padding to catch it well secured above the glow plug if you turn the engine over as the engine starts the glow plug will be blown out with LOTS of force. Like a bullet out a gun! Needless to say kill the ignition as soon as it starts.

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    Full Member merikiito's Avatar
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    what happens is the end of the glow plug swells up a bit stopping it from coming out. If you twist and pull at he same time you should wear the end down enough to get it out. just take your time and keep turning and pulling.
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    Quote Originally Posted by C-Owner View Post
    Cover the glow plug area with a protective mat / towel / blanket.

    Crank the engine to see if it pop's out under compression, but dont run the engine.

    Be careful though please.
    Quote Originally Posted by merikiito View Post
    what happens is the end of the glow plug swells up a bit stopping it from coming out. If you twist and pull at he same time you should wear the end down enough to get it out. just take your time and keep turning and pulling.
    tried all these methods this morning and it won't budge at all, even using the compression method. I've changed 3 of them and it starts much easier now. Will just leave this one alone and hope it doesn't cause any issues in the future.

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