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Thread: Stuck glow plug

  
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    Volvo240GLT's Avatar
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    Stuck glow plug

    Hi, just a quick question, my friend has a stuck glow plug that the garage has refused to try to remove. I'm seeing her this weekend and just wanted to try and get it out.

    My question is, if it breaks with the tip stuck in there, it will still be driveable, right?

    Thanks

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    paul.spencer's Avatar
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    They are there to assist with cold start-up so if it breaks it would still be driveable, but probably rather hard to start-up from cold. Must be a reason why the garage knew not to try to remove it - hopefully they haven't already snapped it, maybe they just knew when to stop trying to undo it.

    They say it can help if you soak the threads with WD-40 or similar for several days before trying to undo them, and warming the engine somewhat might also help.

    Good luck with it - I sure wouldn't want to snap one!

    Cheers, Paul

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    my van currently has one duff glow plug and it starts ok abit rough but still starts fine in the very cold weather

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    The thing is, what options do we have? If we shouldn't try (incl. the mechanic) because it might snap, then what? What's the alternative? Having it not working forever?

    The car (mk3 1.7TD) is really hard to start but not having seen it, only heard from my friend what the garage said, I don't know how many plugs are stuck or maybe it's something else like a relay or fuse.

    Again, short of just trying to get it out, what options are there?

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    Spray them with WD40 before and after each run for a couple of days, when you turn them out apply steady pressure, don't turn them out too fast, if they bind apply more WD40 and keep turning half a turn backwards and forwards, just be careful and you should be ok.

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    I have been told before to pour a little coca-cola around the threads of the plug before removing them. Not sure if it works but think how well it cleans dirty pennies.

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    Hi if it is possible to remove the other 3 , and replace with new ones,

    then simply leave the old stuck one in place, working maybe or not,

    Simples

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    Quote Originally Posted by Volvo240GLT View Post
    The thing is, what options do we have? If we shouldn't try (incl. the mechanic) because it might snap, then what? What's the alternative? Having it not working forever?

    The car (mk3 1.7TD) is really hard to start but not having seen it, only heard from my friend what the garage said, I don't know how many plugs are stuck or maybe it's something else like a relay or fuse.

    Again, short of just trying to get it out, what options are there?
    I did try suggesting a couple of things like soaking the glow plugs several times, several days with WD-40 or similar to help penetrate the threads.

    Doesn't always work, but WD-40 really can help with rusted bolts and stuck glow plugs.

    Another tip I heard was after warming the engine to first apply some slight clockwise torque before counterclockwise torque.

    I reckon the glow plugs on the X17DTL engine can better handle the torque to remove them. I replaced mine months ago and they were the original plugs in there for some 14 years. Came out no problem.

    Do you see the glow plug light on the dash board when you turn the key to warm the plugs? You could use a multimeter to measure voltage to the plugs. If its the GM engine the wire is right up front and easy to get to. There should be ower for several seconds before you can hear the relay click off.

    Don't know the Isuzu somebody else can comment on that one

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    lee gsi's Avatar
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    Have you tested it to see if it needs to be replaced?

    The hotter the engine is the better when you remove it too.
    The truth is always the truth even if you haven't realised it yet...

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    If you can get hold of some 'Plus Gas' is far better than wd40 for unseizing things just leave it to soak overnight if possible.



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