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Thread: Oily glowplugs

  1. 16th June 2011, 08:38 PM #1
    Jojo's Avatar
    Jojo
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    Oily glowplugs

    G'day all!
    Whilst preparing the Disco for another 300.000 kms I changed the glow plugs today. They haven't been done before and I figured it might be worth the while doing it whilst doing all the other stuff anyway.
    To my surprise I found glow plug 3 and 4 covered in oil (I might post a pic later), whereas the other two were clean. Anyone here who can explain to me what is happening?
    The truck doesn't eat any oil(more than the usual amount, i.e. no top up required between intervals), no loss of coolant, runs as always, starts easily (except when bitterly cold, hence the intention of changing the glow plugs) and fuel consumption hasn't changed at all (about 9l/100km).
    Any suggestions, please!
    Cheers
    Johannes

    There are people who spend all weekend cleaning the car.
    And there are people who drive Discovery.
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  2. 16th June 2011, 08:49 PM #2
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    justinc
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    The oily one is probably not working, and as it doesn't glow it won't burn off the sooty combustion deposits etc. You wouldn't know if the plugs are working unless it is minus 10 degrees

    JC
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  3. 16th June 2011, 08:53 PM #3
    Jock The Rock
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    If you still have the old ones

    Hook a wire up to the positive and hold the body of the glow plug to the negative side of a battery

    A general rule is that if that aren't visibly red hot after 5 seconds they're knackered

    This will confirm JCs theory
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  4. 16th June 2011, 10:11 PM #4
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    Jojo
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    Ta for your replies! I'm replacing all of them anyway as a matter of prevention. Had some cold start issues last winter, mind you, we had -20 degrees and below, so it could easily be a faulty glow plug there.
    Cheers
    Johannes

    There are people who spend all weekend cleaning the car.
    And there are people who drive Discovery.
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