engine lubrication system

5/23/2018 Engine Lubrication System

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MIRPUR UNIVERSITY OF SCIENCE AND TECHNOLOGY

EngineLubrication S!te"!

TOPIC


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Group Members

Muhammad Usman Shahid 10-ME-112

Syed Mustafa aider 10-ME-12!

"a#ar $bbas 10-ME-1%1

$&ais $hmed 'a#a 10-ME-1%(



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Meaning of lubrication

Friction - is created when there is relative motion between two

surfaces

Lubrication is use of a material between surfaces to reduce

friction

Any material used is called a lubricant

Two main methods

1. Hydrodynamic lubrication Also called complete or full flow

ccurs when two surfaces are completed separated by a fluid film



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Types of Lubricant - !hysical

2. Boundary lubrication

Occurs when Hydrodynamic lubrication fails.

By adsorption or chemical reaction

Li"uid

Typical lubricants are li"uid#fluids

Mineral oil or synthetic oils

$olid

%raphite& Mo$'

$emi solid %reases

%ases

Atomised ' stro(e oils



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)educing friction

)educing wear

$ealing power Absorbing shoc(

*leaning

*ooling

Functions of Lubrication Oil



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$/$T0M



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!urpose of Lubrication $ystem

)ubri*ate

Reduces Frictionby creating a thin fi+m(Clearance)

between moving parts Bearings and journals)



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Sea+s

!he oil helps form a gastightseal between piston rings

and cylinder walls

Reduces Blow-By)

"nternal oil lea# blow$by% will

result in BLUE SMOKEat the

tale pipe.MIRPUR UNIVERSITY OF SCIENCE AND TECHNOLOGY


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C+eans

&s it circulates through the engine' the oil pic#s up metal

particles and carbon' and brings them bac# down to the pan.



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Coo+s

(ic#s up heat when moving through the engine and then

drops into the cooler oil pan' giving up some of this heat.



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$bsorbs sho*,

)hen heavy loads are imposed on the bearings' the oil

helps to cushion the load.

$bsorbs Contaminants

!he additives in oil helps in absorbing the contaminants

that enter the lubrication system.



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$*$T/

*iscosity is a measure of oil+s resistance to flow.

& low viscosity oil is thin and flows easily

& high viscosity oil is thic# and flows

slowly.

&s oil heats up it becomes moreviscous Becoes t!in)



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$*$T/ "f the oil is too thin!as "ery low "iscosity) it will be forced

out from between the moving parts' resulting in rapid wear.

"f the oil is too thic#!as "ery !ig! "iscosity)it will flow very

slowly to engine parts' especially when the engine and the oil

are cold' resulting in rapid wear.

is*osity Inde. is the measure of how much the viscosity ofan oil changes with temperature. 2, )%

*iscosity number is set by S$E (Society o# $utooti"e

Engineers)



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$*$T/ Sin/+e is*osity oi+s-& /)' -& 0,) )inter% and

-& 2,' -&1, -ummer%

Mu+tip+e is*osity oi+s-& 0,)$1,.

!his means that the oil is same as -& 0,) when cold

and -&1, when hot.

!he higher the number the higher the viscosityt!ic%ness)of oil.



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!roperties of oil Corrosion and 'ust Inhibitor3isplaces water from

metalsurfaces' to prevent corrosion.

oamin/ 'esistan*e Rotating cran#shaft tends to cause

bubbles Foa)in the oil and bubbles in oil will reduce the

effectiveness of oil to lubricate.

Syntheti* Oi+s4ade by chemical process and do not

necessarily come from petroleum.



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$ervice )ating of ilS$3 S43 SC3 S53677S8

S$ and S4oils are not recommended for use in today+s

&utomobile engines.MIRPUR UNIVERSITY OF SCIENCE AND TECHNOLOGY


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!artsOi+ Pumps3riven by camshaft' cran#shaft Rarelyre&uild &y an auto tec!nician)

Rotor (ump('wo star s!aed rotors us t!e oil)

5ear oil (ump



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!arts

Oi+ Pan

-tores the oil and helps in cooling the oil

(an gas#et splits if over tightened.



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!arts

Pressure 'e+ief a+eto prevent the buildup of high

(ressure Causes t!e oil #ilter to &ulge &ut not a coon

ro&le)*

Good oi+ pressure is

90-:0 psi



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!arts

Oi+ Pressure Indi*ator Light or a 5auge

!he light turns on or gauge reads low when

the pressure drops below 0,psi.

Common *auses of +o& oi+ pressure are

)o& oi+ +ee+ ;orn out pump

Low oil pressure -afety system will shuts down the car by

cutting the ignition -ystem(Sar%)*

Good oi+ pressure is 90-:0 psi7



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!arts

Oi+ i+ter filters the oil

-ome particles are too small for the filter E+ement(aer

in t!e #ilter% to trap.



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!arts

Oi+ Ga++eries

5e+ier the oi+ to top

end and returnin/ itTo the oi+ pan7



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!arts

Positie Cran,*ase enti+ation a+e

Po++ution preention

4+o&-by ba*, into the inta,e Preent s+ud/e in the en/ine7



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!arts

Oi+ Pressure sendin/ unitelectrically sends thesignal to the Light or 5auge mounted on the dash.

"f the wires get shorted the light will come on or

the gauge will read high.



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L *HA%0

Eery %000


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An #ue!tion re$ate% tot&e!e !$i%e!'

engine lubrication system

Documents

urpose of lubrication

hydrodynamic lubrication

twosurfaces lubrication

boundary lubrication

engine parts

inmirpur university

oil pic

low viscosity oil