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  • Classics Monthly

    CHECKING AND CHANGING GLOW PLUGS

    Nov 05, 2019 5 minutes
    WORDS AND PICTURES: JACK GROVER

    Broadly speaking a diesel engine has no ignition system, relying instead on the heat generated by the extreme compression of air in the combustion chamber to set a finely-metered quantity of injected fuel alight. But that causes issues for starting diesels in cold conditions – the metal of the block and cylinder head, the coolant sat within them and the air being drawn into the engine are all at ambient temperature, which can cause the heat generated by compression alone to leach away. Even if the engine does start, it may run unevenly, not idle properly or emit unpleasant clouds of smoke until the engine temperatures begin to rise and combustion takes place as it should. Therefore, most automotive diesel engines of the past 80-plus years have been fitted with glow plugs.

    Glow plugs are electrical items, consisting

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