Transcript Small Engine Principles of Operation I

Small Engine
Parts Identification Test
1) ?
-Holds the fuel for engine consumption
-Sometimes houses Carburetor
-Usually has a shut off valve
-Can house a screen that can become
impermeable due to varnish or trash
2) ?
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Separates debris from air taken in during
operation
Does NOT separate water!
Affects engine performance & life
Most cost effective service part found on any
engine
May use a pre-cleaner
Various shapes and sizes
Constructed of many different materials
3) ?
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Mixes fuel with air to provide a combustible gas
Depending on specific application a carburetor
may be Up-draft, Down-draft, or Side-draft
Can be found on fuel tank, but….
Will always be fixed to an intake manifold that is
fixed to the cylinder head or block
May have multiple jets or “barrels” that regulate
fuel consumption
Will have either manual or electric choke
4) ?
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Part of the ignition system that
provides a “spark” to ignite fuel/air
mixture during powerstroke
Commonly misunderstood and
misdiagnosed part
Comes in many lengths and heat
ranges
Not all spark plugs are created equal
5) ?
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Induces an electric current when
rotated around a magnetic field
Always mounted in respect to
flywheel location
Common ignition source of choice for
newer carbureted engines
Replaced breaker points ignition
6) ?
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Volume of the cylinder above the
piston in which combustion takes
place
Located mainly in the cylinder head
7) ?
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Shaft containing lobe (cams) that
open and close valves as the shaft
rotates
Controls engine timing (advance,
Retard)
Rotates in conjunction with the
crankshaft
8) ?
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Rod that connects the piston to the
crankshaft
Large end – crank end (end w/bolts)
Small end – piston end
Attaches to piston via the wristpin
9) ?
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Housing for the crank, cam, etc.
Base of the engine
Contains engine oil
Seal housing
10) ?
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Main shaft of the engine
Provides the reciprocating motion of
the piston
Outputs rotary motion to be used to
do work (ie. Turn pulleys, blades,
etc.)
11) ?
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The bore in which the piston rides
Usually made into the crankcase
Generally the largest engine
component
12) ?
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Detachable portion of the engine that
houses the combustion chamber
Can house valve components (OHV
engines)
Always houses spark plug(s)
13) ?
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Valve that permits exhaust to leave
combustion chamber on exhaust
stroke
Always the smaller of the two valves
(int, ex)
14) ?
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Valve that permits air/fuel mixture to
enter the combustion chamber on
intake stroke
Always the larger of the two valves
(int.,ex)
15) ?
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Cylindrical part with closed surface
area on one end connected to the
crankshaft via the connecting rod
Forces fuel/air mixture into
combustion chamber
Exerts force back down to the
crankshaft
16) ?
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Part of the piston above the rings
Can be flat , domed , or dished
17) ?
Expanding rings placed in the
grooves of pistons to create a seal
that keeps oil down and the fuel/air
mixture up
 Never align the open ends when
installing rings
 Ring types- compression &
oil
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18) ?
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Wheel bolted to one end of the
crankshaft that maintains the speed
of the engine during operation
Sometimes used for engine balance
Either used on work-end of the
crankshaft or the free-end
19) ?
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Used to keep the flywheel in place
Also used as a breaker point in some
ignition systems
20) ?
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Used for both filling & checking
engine oil
Always locate this plug before doing
anything to any engine
Service life begins Here!