fbpx

Parts of 4 Stroke Engine

The four-stroke engine has the following major components:

  1. Fuel injector
  2. Piston
  3. Inlet Valve
  4. Exhaust Valve
  5. Crankshaft
  6. Connecting rod
  7. Engine block
  8. Flywheel

Piston and Piston Ring

The piston in the 4-stroke diesel engine produces reciprocating movement. It connects with the crankshaft via a connecting rod. It transfers its motion to the crankshaft via a connecting rod. The piston moves downwards and upwards inside the cylinder of the engine.

When the piston moves up, it sucks the air inside the cylinder, while it compresses the air when it moves downward. Due to this piston movement, the temperature and pressure of the air-fuel mixture inside the cylinder increase.

The engine piston has a complex construction with a steel crown and a ductile cast iron skirt. This skirt uses pressure lubrication to ensure oil delivery to the cylinder liner underneath each working situation. Oil feds toward the cooling duct at the top of the piston via the connecting rods. All piston rings are chrome-plated to resist wear. The piston ring contains a spring-compatible oil control ring and 2 guiding compression rings. The piston ring groove has excellent wear resistance and is stabilized.

Cylinder Linear

This component of the four-stroke engine has a high, rigid collar to lessen deformation. This linear material is a gray cast iron alloy with high strength and brilliant wear resistance. Precisely placed vertical cooling water holes ensure precise temperature control. To avoid the bore polishing risk, the linear equips with a protective polishing ring.

The space among the cylinder liner and the cylinder block seals with a double O-ring. The upper end of the linear equips by an anti-polish ring that prevents the internal bores from being polished and reduces the consumption of lubricating oil.

Big end bearings and Main Bearings

The big end bearing is a lead bronze lining with tri-metal steel backs and a thick, smooth-running layer. The bi-metal bearing, as well as tri-metal bearing are depleted as the main bearings.

Connecting Rod

This component of the 4-stroke diesel engine connects the engine crankshaft and piston. It is made of Alloy steel and forged in one piece. A connecting rod is machined in a circular cross-section. The lower side of the connecting rod splits in the horizontal direction so that the connecting rod and the piston can be removed from the cylinder liner. The gudgeon pin bearing consists of tri-metal.

All bolts of the connecting rod are tightened hydraulically. The holes in the connecting rod direct oil to the pistons and gudgeon pin bearing. This component of the engine transfers the motion of the piston to the crankshaft, which further moves to the vehicle’s wheel.

Crankshaft

The crankshaft transforms the reciprocating motion of the engine piston into rotary motion. It is an essential component for all the engines. This part transfers final power in the form of kinetic energy. It is made in the form of one piece. Connecting rod makes a link between the crankshaft and piston of the engine.

Engine Block

The engine block is constructed of ductile iron and is suitable for all cylinders. The major bearing caps are fastened from underneath with two hydraulic tensioning screws. These caps are directed at the bottom and top laterally through the engine block. A hydraulically tightened horizontal side screw supports the main bearing cap.

Camshaft

It is used to open and shut input and exhaust valves and to control the fuel pump in a diesel engine with high pressure.

Spark Plug

It uses in petrol engines or SI engines. It uses to provide the spark to the air-fuel mixture to ignite it.

Fuel Injector

It is used to inject the fuel inside the engine cylinders. Some engines use fuel pump instead of fuel injector.

Flywheel

This component of the four-stroke petrol engine mounted on a cast iron pole. It stores energy as inertia.