Hornsby Oil Engine

An oil engine can be a touchy beast. Here are complete instructions from one manufacturer on the care and use of theirs

| January/February 1968

  • Hornsby oil engine
    The oil engine must be set level and square to its drive, and bolted toa block of good hard concrete.
    ILLUSTRATION: GAS ENGINE MAGAZINE
  • Ring oil bearing
    The oil reservoir of ring oiled crankshaft bearings must be filled to the indicated level.
    GAS ENGINE MAGAZINE
  • Piston Rings
    Ifnecessary to remove a piston ring, lift the point of ring, thentake a piece of thin flat steel or tin and push it under the ring,slide it round the piston; then slip in another piece, following onuntil four pieces are under the ring, when the ring will havesprung to the size of piston and will easily slide off.
    GAS ENGINE MAGAZINE
  • Filter
    Component of a Hornsby oil engine.
    GAS ENGINE MAGAZINE
  • Vaporiser
    Adjustments of compression to suit local conditions orvariations of oil can be made by moving the roller on end ofexhaust lever
    GAS ENGINE MAGAZINE
  • Vaporiser
    To trim the lamp, fill the reservoir of lampthrough plug "A" level with plug "B," replace plugs "B" and "A," then turncock "C" to position "STOP."
    GAS ENGINE MAGAZINE
  • Self-starter
    Component of a Hornsby oil engine.
    GAS ENGINE MAGAZINE
  • Skew Gearing
    If the crankshaft is taken out,be sure that the Skew-wheel Gearing is afterwards put together as shown.
    GAS ENGINE MAGAZINE
  • Oil pump
    Testing the spray: After pumping vigorously for some time toexpel air from the pump or pipes, the slightest movement of thepump plunger ought to cause a corresponding delivery of oil pastthe thumb held over the mouth of the pipe.
    GAS ENGINE MAGAZINE
  • Air and Exhaust Valves
    Component of a Hornsby oil engine.
    GAS ENGINE MAGAZINE

  • Hornsby oil engine
  • Ring oil bearing
  • Piston Rings
  • Filter
  • Vaporiser
  • Vaporiser
  • Self-starter
  • Skew Gearing
  • Oil pump
  • Air and Exhaust Valves

The Hornsby oil engine works on the Otto Four Cycle, i.e., one explosion for two revolutions of Crank. The oil is converted into vapour by being sprayed into the hot Vaporiser. The explosion is obtained by the compression of fresh air along with the vapour already in the hot Vaporiser.

A separate plan is supplied with each Engine giving particulars for erection and diameters of pipes required.

The Vaporiser Cap End is heated by lamp before starting and is kept hot by the explosions.

The Lamp is required for starting only.



The Speed is regulated by governor acting on relief valve (see Vaporiser Valve Box, p. 15), a portion of oil delivered from pump escapes and flows back to Oil-tank, thus reducing the quantity sprayed into Vaporiser, and consequently reducing the force of explosion.

The Engine must be set level and square to its drive, bolted to a block of good hard concrete.