Pneumatic indicator for finding the top dead centre (TDC). For gas and diesel engines. Instrument for finding and setting the piston top dead centre consists of a hose with rapid coupling, fitted on the other end with a plexiglass tube with an air-driven piston. Setting the engine piston to the top dead centre is important, for instance, when investigating pressure drops/losses in the engine cylinders due to leaks in the combustion area. Suitable for engines without clearly legible indications of the top dead centre on the block and belt pulley of the engine, etc. Set contains 8 – 18 mm adapters for spark plugs and glow plugs and a magnetic fastener.