Engine head is a part which is
fixed on the top of cylinder block,
houses & valves.
Engine head is bolted to cylinder
block with head gasket and cam
Inlet & exhaust ports are also
machined in head.
Use Of Engine
Part of the engine where cylinder located is
called engine block or cylinder block.
Engine cylinder is a part where fuel is admitted
in a reciprocating motion of piston obtained by
Engine cylinder characterized in bore & stroke,
bore represents inner diameter & stroke is the
distance travel by piston.
Cam shaft is a shaft in which cams are fitted
Function of cam shaft is to operate valves
directly by sitting over or indirectly through a
Opening or closing of valves is governed by
camshaft which is coupled to crank shaft
either directly through a reduction gear or
indirectly through a pulley and timing belt.
Crank shaft has
& offset from
the shaft axis of
block in a
obtained from the
piston into rotary
Piston is a cylindrical
part which moves up
& down in cylinder.
Use Of Piston
Piston diameter is
slightly less than bore
Piston rings are fitted in piston &
in direct contact with cylinder liner
to prevent piston wear
Use Of Fuel Pump
Fuel pump sprays pressurized fuel in to the
cylinder & fuel gets ignited when it comes
in contact with the air.
The fuel pump consists of a spring loaded
piston valve in a cylinder. When fuel from the
fuel filter is introduced in the fuel pump, the
spring loaded piston applies pressure
Use Of Filters
Fuel filter restricts the flow of
fuel & it also collects debris
that would pass through
Always change filters as per
service manual of car,
otherwise calculate the miles
Self starter is used for engine start. To
accomplish this, the starter motor is
connected to a key operated switch and a
When ignition switch is on, the circuit is
completed and it pushes out pinion of motor
shaft which goes into mesh with flywheel
Use of Fuel
It controls injection process
so that required amount of
fuel is injected into the
cylinder before firing.
It helps in proper fuel
distribution, improve engine
performance and lesser