Rescuing a 12 HP Olds Engine

12 HP Olds engine lives on after disastrous accident.

Olds Gasoline Engine Spring
The Olds, showing its spring (at left) for the intake valve. A bracket at the bottom of the spring moves up and increases tension on the spring when the exhaust valve is held open. The rod that pushes the bracket up is connected, through a tube inside the water jacket, to the exhaust rocker arm below the cylinder. The red wire is connected to the ignition coil and spark plug. The black wire is connected to the primary winding of the coil and the timing “points” (pendulum). The Olds doesn’t have a fuel pump; the gas tank is built into the cast iron base, and a section of piston draws gasoline up into the carburetor.
Photo By Bill Vossler