DK28 diesel engine accessories L16/24-piston

The piston is a reciprocating component in the cylinder block of an engine. The basic structure of the piston can be divided into a top, a head, and a skirt. The top of the piston is the main part of the combustion chamber, and its shape is related to the type of combustion chamber selected. Gasoline engines mostly use flat top pistons, which have the advantage of small heat absorption areas. There are often various pits on the top of the piston in a diesel engine, and their specific shape, location, and size must be adapted to the requirements of mixture formation and combustion in the diesel engine.

The entire piston can be mainly divided into three parts: piston crown, piston head, and piston skirt.

The main function of the piston is to withstand the combustion pressure in the cylinder and transmit this force to the crankshaft through the piston pin and connecting rod. In addition, the piston, together with the cylinder head and cylinder wall, constitutes a combustion chamber.

The following methods can be used to handle piston knock on marine diesel engine accessories:

(1) After the engine is started, there is a knocking sound during low temperature operation. After the temperature is normal, the sound disappears. You can temporarily leave it untreated and continue running.

(2) When the engine temperature is normal, there is an obvious knocking sound, and high-speed operation should be avoided as much as possible. Disassembly and maintenance should be carried out as soon as possible.

(3) After removing the cylinder head and pulling out the piston, it is found that the cylinder is seriously out of round or pulled, or the gap between the piston and the cylinder is too large. Replace the cylinder liner, piston, and piston ring.

(4) If the connecting rod is found deformed, it should be replaced as much as possible.