Piston Engine Propulsion

Overview and Mechanical Arrangement

• What is a Piston Engine?

• - It is an internal combustion engine which produces power by controlled burning of fuel.

• A piston moves back and forth in a cylinder.• The engines power is generated by a force exerted

on the piston by the rapid expansion of the gases resulting from the combustion of a compressed fuel – air mixture.

• The power from the motion of the piston is transmitted through a connecting rod to a crankshaft, which is connected to the propeller.

Cylinder

Piston

Connecting Rod

Crank Shaft

‘Big-end’

Gudgeon Pin Main

Bearings

Offset Bearing

Counter Balance Weight

1

23

4Pistons

Crankshaft

Rear

Front

Flywheel attachment

flange

Timing Belt and Water Pump

driving pulley location

Main Bearings

Sump (Oil Tank)

‘Rocker Box’ Cover

Cylinder Block

Flywheel

Valve Gear

Crankshaft and Pistons

Exploded View of the Engine

Cylinder Head Assembly

Timing Shaft

Inlet Valve Exhaust Valve

Rocker

Rocker Shaft

Closing spring

Valve Seat

Push Rod

Cam Shaft

Inlet Valve Closed Inlet Valve Open

Valve Lift