Chapter 6 Flashcards
Three main basic requirements for an engine to run
Fuel
Air
Spark
How does an engine work ?
Fuel supply to the engine chamber
Field passes through the carburetter where it’s mixed with air before entering the ignition cylinder
Electronic, spark from the spark plugs, ignites the fuel and air mixture
Most common type of pump in firefighting
Centrifugal pump
What does primed mean
The pump had to be full of water
What causes a pump to lose its prime?
When air is introduced to the pump, it will stop pumping water
What kind of stroke are most engines?
2 strokes
What is the mix gas ratio?
50:1
What do four stroke engines mean for fuel?
Straight gas
Suction hose
This is a non-collapsing hose that allows water to be drawn from the water source into the pump head
Footvauls
Football threats onto the mail, end of the suction hose, and there’s a one-way valve to prevent water from pulling back and out. It has a screen which helps provide debris from entering the pump, end
What must the valve spring and rubber plunger do?
Work together to form a seal with a rubber washer that is properly seated in the female threads
Fuel line
The fuel line is inserted into the fuel container the black plastic cap is that it onto the spout opening of the container the gray female connecter often called Mark fitting attaches to the pump
Hose coupling wrench
The hose coupling wrench is used to tighten or loosen the intake hose couplings attached to the pump end. It also used to tighten or loosen the priming cap of the pump as well. Any 1/4 term quick connect fittings that are stuck together.
stranglers
 Are used to restrict water flow in one and a half inch hose line the restriction laws for firefighters to add or remove lengths of hose
How much space conflict between the jaws of the stranglers
1/8or 3mm
Street stream nozzles provide generally high and low
High pressure low volume
Popular type of adjustable stream nozzle
Hanson nozzle
Some uses for straight stream nozzles
To construct fire guards
Dig holes
Penetrate splash or heavy, feels
Fog Nockels provide high and low what
High volume, low pressure
Why don’t we put suction hose is on the bottom
You can suck up debris, sand, gravel, and damage pump
Why can’t we put pumps on tonight or slope?
It can vibrate into the mud and fall down the hill
Death of water and needs to be in
Football needs to be a minimum of 20 cm are in 8 inches
to avoid sucking air
Ways to protect the pot value
Tie it to a shovel, anchor shovel at the bottom, tie it to a log use a floating walk or buoyant objects rested on rocks
Steps to prep pump
Connect fuel line to fuel tank
Open air vent located on top of your tank
Attach to engine
Squeeze the primer bulb several times, until the gas appears in the fuel line
Check foot valve
Phil suction hose with water by deafening it into the water
Attach suction hose to pump
Open top cap on pump
Prime it
Steps to start pump
Set choke for cold engines
Set throttle lever to start sauce, warm up position
Turn on
Checks at the over speed cut outs, which is pushed in
Study the pump and start pulling
What’s the engine is started put choke and run position. Is the engine warms up
Oh wow engine to warm up for at least two minutes before running full throttle
4 reasons pump isn’t running properly
Fuel
Spark
Flooding
Lots of prime
Problems with fuel
Wrong mixture
Is there enough fuel ( getting to the calibre)
Is the vent Cap lose
Is Fuel lines, primed
Is there too much fuel?
Problems with spark
The rest rod is in the wrong position for starting
The engine is switched off
Spark, plug top attached properly
Spark plugs, Burt
Air promblems
Is the air filter dirty?
Is the carburetter lose?
Flooding
If the spark plugs are with the engine has flooded
Sweating results from over choking
What causes a lose of prime
Foot valve plugged
Missing gasket
clogged suction hose
