Heavy Vehicle Engine Spare Parts

Cylinder Head

In an internal combustion engine, the cylinder head is the component located on top of the cylinders. The upper part of the cylinder block is open, allowing the pistons to be visible inside the cylinders. Additionally, there are holes in the engine body (in block engines) that are open at the ends.

Cylinder Head Gasket

The cylinder head gasket is a component that seals the space between the cylinder and cylinder head, preventing the escape of combustion gases, leakage of coolant, and oil leaks.

Piston

The piston is part of reciprocating engines, pumps, compressors, and pneumatic cylinders. It is a moving component that fits inside the cylinder and plays a key role in generating linear motion.

Piston Ring

The piston ring is a circular metal part that fits on the piston. Its main functions include:

• Sealing the combustion chamber

• Controlling oil consumption

• Heat transfer

It creates a seal between the piston and cylinder wall, preventing combustion gases from leaking down and oil from entering the combustion chamber.

Crankshaft

The crankshaft is one of the main moving parts of the engine. It converts the pistons’ reciprocating motion into rotational motion. Located at the heart of the engine, any damage to the crankshaft can affect the entire powertrain.

Valves

Valves control the intake and exhaust of air and fuel into the cylinders to ensure the proper engine cycle. Depending on the engine design, valve operation systems may vary.

Timing Belt

The timing belt is a toothed belt used to synchronize the crankshaft and camshaft. The crankshaft moves the pistons, while the camshaft opens and closes the valves. The timing belt ensures that both move in proper timing for the engine to function correctly. Made usually of rubber, the belt must be replaced regularly, as a broken belt can severely damage the engine.

Water Pump

The water pump is a mechanical pump that circulates coolant (water or antifreeze) through the vehicle’s closed cooling system. It is usually driven by a belt connected to the engine.

Radiator

The radiator is a vital component of the cooling system that dissipates engine heat. Coolant flows through the radiator tubes and transfers heat to the air, protecting the engine from overheating.

Oil Pump

The oil pump circulates engine oil through the lubrication system, creating the flow necessary to lubricate the engine. Oil passes through the filter before being pumped to the engine.

Transmission and Powertrain Parts

Clutch Disc and Pressure Plate:
The clutch kit is the main part of the clutch system that transmits engine rotational force to the gearbox and allows gear changes.

Gearbox:
The gearbox or transmission adjusts speed and torque between the engine and wheels, allowing the engine to operate optimally while providing the necessary power for vehicle movement.

Differential:
The differential splits engine power between the wheels, enabling smooth rotation.

Drive Shaft (Axle Shaft / Half Shaft):
The drive shaft transmits engine power from the differential to the wheels. Key components include:

• Drive shaft end (CV joint): Connects to the wheel

• Drive shaft boot: Protects against dust and debris

• Spider joint: Connects the shaft to the differential

• Tripod joint: Located at the connection of the shaft and spider

• Main shaft: Transfers rotational force

Drive shaft failure may cause steering vibrations, unusual noises, or reduced vehicle mobility.

Suspension and Steering Parts

Shock Absorber:
A mechanical device installed near each wheel to control spring oscillations. One end is attached to the chassis, the other to the suspension component.

Spring:
Supports vehicle weight, maintains ride height, and absorbs road shocks. Springs are usually steel rods or coils.

Control Arm:
A metal part that connects the chassis to moving suspension components, critical for stability and handling.

Knuckle (Steering Knuckle):
Supports the suspension and allows wheels to rotate around it. Also houses wheel bearings and connects to the control arm and chassis.

Sway Bar (Anti-Roll Bar):
A metal rod connecting wheels to reduce body roll in corners and uneven surfaces, improving stability and safety.

Brake System Parts

Brake Pads:
Friction components of the disc brake system that slow the vehicle by pressing against the rotor.

Brake Disc (Rotor):
A metal disc between the wheel and hub that interacts with brake pads.

Brake Caliper:
Applies pressure to the brake pads against the rotor to reduce wheel rotation and stop the vehicle.

Brake Master Cylinder:
Converts pedal force into hydraulic pressure, amplified by the brake booster.

Brake Booster:
Increases pedal force, allowing the driver to brake with less effort.

Electrical Parts

Alternator (Dynamo):
Converts engine mechanical energy into electricity to charge the battery and power vehicle electronics.

Starter Motor:
A powerful electric motor that turns the engine during startup.

Spark Plug Wire:
Transmits electrical current from the ignition system to the spark plug.

Ignition Coil:
Converts low-voltage battery current to high voltage for the spark plugs.