General information about engines (Mitsubishi Lancer 9)

Petrol engines 4G15 and 4G93 are in-line four-cylinder engines with overhead camshafts and valves in the cylinder head.

Cylinder firing order: 1-3-4-2.

The cylinder block is made of cast iron, the cylinder head and coolant pump housing are made of aluminum alloy.

The forged steel crankshaft is supported by five bearings. The bearing caps are integrated into the crankshaft bed to increase the rigidity of the cylinder block.

The piston is cast from a special aluminum alloy and is connected to the connecting rod by a floating piston pin.

Piston rings are cast iron. The first ring has a barrel-shaped outer surface, the second ring has a conical outer surface with a bevel. The oil scraper ring is composite, scraper type with a spring expander.

The cylinder head contains tent-type combustion chambers. The intake and exhaust valves are made of heat-resistant steel. Adjusting screws are used to adjust the clearance in the valve drive. The rocker arms with rollers are cast from an aluminum alloy and have a wear-resistant support surface that contacts the camshaft cam.

The cast camshaft is supported by five bearings and is located in the tunnel housing of the cylinder head.

The camshafts are driven from the crankshaft by a toothed belt, the belt tension is adjusted by a spring tensioner.

(The original was published on the website: mitsubishiman)