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

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.