Engines - Fundamentals Flashcards
What must be done to make a gas starting motor safe on an engine?
lock and tag the valves
True or false:
The gas used for pneumatic start motors or air injection start systems can be either compressed air or natural gas.
true
How should the battery be made safe when working on an engine?
remove the negative lead (first) to prevent arcing
What should be done to prevent rotation in engines that have had the flywheel removed or that have no provisions for locking?
block the engine under the throws of the crankshaft
Why is it a good idea to inspect all gaskets that come out of an engine that is being worked on?
they can provide clues to issues
What should be located on a scaffolding system before any personnel can use it?
an inspection tag;
this indicates that the scaffolding has been inspected and is ready for service
Why should one never point compressed air towards themselves?
injection injury;
compressed air can penetrate skin, causing death
What steps must be completed before any work on an engine can start?
disconnect electrical, close, lock, tag and purge all gas sources used for starting and operation
How should natural gas engines be shut down to prevent restarting?
the gas supply should be shut off, and the engine allowed to run out of gas
What special precautions must be taken when working on engines with magneto ignition systems?
they create their own spark without the need of a battery;
can cause a fire if the fuel system is not properly isolated vented
*usually seen with natural gas engines
Why type of engines have porting on the cylinders?
two-stroke engines
In an engine, the camshaft turns at _________ the speed of the crank.
1/2
This engine component seals and confines the expanding gas, along with housing the combustion chamber, valves, valve ports, valve guides, valve springs and rocker arms.
the cylinder head
This engine component is the main structure of the engine that supports all the working parts to keep them aligned.
the block or frame
This engine component is a hollow tube in which the piston slides up and down to harness the expansion of burning gases.
the cylinders
In an engine, the _______________ can be removable, non-removable or cast into the block or bolted to the block.
cylinders
This engine component forms the movable end of the combustion chamber, and transmits the power from the expansion of the burning gas into linear motion.
the pistons and rings
This engine component helps to seal the burning gases to harness as much energy as possible, while also controlling oil consumption and transfer heat from the pistons to the engine block.
the piston rings
This engine component is the link between the piston pin and the crankshaft.
the con-rod
What is the wrist pin of an engine also known as?
the piston pin
True or false:
The con-rod in an engine must be strong enough to absorb the force of the piston without flexing.
true
This engine component changes the linear motion of the piston to continuous usable rotary motion.
the crankshaft
This engine component connects the flywheel and balancer to form one rotating mass.
the crankshaft
This engine component opens and closes the intake and exhaust valves.
the camshaft