Engine Pistons:

Piston liners line the cylinder in which the pistons run.
They are typically made of a more durable metal than the engine block itself and replacing them when they are worn can extend the life of your engine.

Engine Piston Rings:

Piston rings maintain gas compression between the piston and the cylinder wall. Piston rings seal the cylinder so that combustion gas generated at
the time of ignition does not leak into the opening between the piston and the cylinder.

Crankshafts:

The crankshaft is an engine component that converts the linear (reciprocating) motion of the piston into rotary motion.
The crankshaft is the main rotating component of an engine and is commonly made of ductile iron.

Main Bearings :

In a piston engine, the main bearings are the bearings on which the crankshaft rotates, usually plain or journal bearings

Engine Manifolds :

The engine intake manifold is a casting or assembly of passages through which air or an air-fuel mixture flows from the airintake or throttle valves to the intake valve
ports in the cylinder head or cylinder block.
The engine exhaust manifold is a casting or assembly of passages through which the products of combustion leave theexhaustvalve ports in the cylinder head or cylinder block and enter the exhaust piping system.

Valve Train Components :

Valve train systems control the gas exchange, which means that they represent a significant opportunity for optimizing the combustion process

Clutch Plates :

The clutch is one of the most important parts in a manual transmission car as it connects the engine with the gearbox, and is what provides motive force for the car.
It is also one of the parts of the car that sees high wear and tear depending on a person’s driving style and the environment it is driven in.

Transmission Gears :

Gear is a part of transmission - or you can say a toothed wheel that is used to transfer motion from one shaft to another.

Transmission Gears :

Drive shaft is a mechanical component for transmitting torque and rotation, usually used to connect other components of a drive train that cannot be connected directly because of distance or the need to allow for relative movement between them

O-Ring Seals :

O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.