Optimus pre-heater (‘quicklighter’) fettle

Discussion in 'Fettling Forum' started by presscall, Jan 17, 2021.

  1. presscall

    presscall United Kingdom Subscriber

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    Installed in a Primus 1550 new to me, so along with other components I took it apart to check on its condition.

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    I’ve experience of this model of quicklighter from its application in an Optimus Rider stove where it’s used to atomise fuel (white gasoline in the stove application) at the stove’s jet nipple during start-up.

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    The quicklighter valve. The pressurised fuel passes out of the orifice uppermost in the photo, pressurised air from the top of the font emerges from the orifice at the bottom.

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    This component screws onto the valve, operated by the lever that fits over it, contains the atomised fuel delivery jet orifice (centre) and provides ‘on’ and ‘off’ function at the turn of the lever - anti-clockwise for off.

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    On or off is determined by the tip of the valve mating with the rear of the jet orifice.

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    On the stove the control lever is secured on the movable valve component with a grub screw.

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    On the lamp, the threaded quicklighter shroud screws down onto it.

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    The quicklighter screws into a threaded mounting on the fuel tank ...

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    ... a lead washer providing the seal. I use a threadlock paste for added security.

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    Problems that can arise? A fuel/air leak due to wear or age-hardening of the O-ring in the valve. If thread-lock isn’t used it’s theoretically possible for the threads to loosen enough to prevent the lead seal from sealing. Other problem is a blockage of the fuel, air and/or fuel/air orifices. Solution is to remove the valve and shift the blockage(s) with compressed air. Check the gauze filter on the fuel pickup tube, which may have failed, leading to the blockage. Clean fuel and a clean tank interior are the best preventage measures.

    I’ll post details of the lantern in the Stove Reference Gallery in due course.

    John
     
    Last edited by a moderator: Jan 18, 2021
  2. ROBBO55

    ROBBO55 Subscriber

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    Thanks John, I haven't had one apart and it's good to know what's in there. :thumbup:
     
  3. presscall

    presscall United Kingdom Subscriber

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    Pre-heater in action and mantle ignition ...


    ... then after a few more strokes of the pump.

     

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