Powerplant Midterms and Finals Rev02/07/24
What lubrication method is used for the camshaft journals?
Splash
Immersion
Spray
Pressure
What does this component do?
Regulates oil pressure in the oil system on the O200 engine
Controls oil flow to the vacuum pump on the O200 engine
Controls oil pressure to the suction screen on the O200 engine
What is a cylinder barrel made from?
Cast aluminum
Cor-ten steel
Chrome molybdnem steel
Stainless steel
How are the halves of a crankcase sealed?
By “00” silk thread and sealant
By a paper gasket
By a silicone gasket
By a cork gasket
Name this component from the O200 engine?
Oil pump housing
Oil pressure regulator
Oil suction assembly
Oil pressure screen
What was this tool used for?
Torque based nut only
Remove and install cylinder base nut
Torque through bolt only
Remove inner cylinder baffle
What is backlash?
It is the movement of the gear longitudinally on its axle
It is the movement of the gear laterally on its axle
It is the crankcase between the tips of the gear teeth and the housing
It is the clearance between mating gear teeth
What is under this cover plate?
Oil pressure regulator
Oil pump gear
Oil pressure screen
What tools is used to remove the Lycoming O235 cylinder base nuts?
A ratchet and socket
Ratchet and cylinder base nut wrench
Vise grips
Combination wrench
Why are there two valve springs per the intake and exhaust valve?
To prevent valve float
To get more spring bounce
Only the intake has two springs
Only the exhaust has two springs
What is the purpose of adjustment screw on this part?
To set valve clearance on an engine with solid lifters
To set valve backlash on an engine with solid lifters
To set valve clearance on an engine with hydraulic lifters
To set valve backlash on an engine with hydraulic lifters
Why is it important to follow the correct torque pattern when reassembling a crankcase?
So the through bolts will not twist
So the crankcase is held and aligned properly in the case with its associated bearings
So the crankcase will not crack
So the camshaft bearing do not spins
What are valve guides made from?
Brass and thread in
Bronze and area shrink fit and pressed in
Bronze and glued in
Aluminum alloy shrink fit and pressed in
How were piston rings end clearance measured?
With micrometers
With vernier calipers
With feeler gauges
With a depth gauges
What needed to be done to get the piston into the cylinder with installing the cylinder on the Lycoming O235 engine?
A pry-bar must be used
A hammer must be used to tap the cylinder down
A ring compressor must be used
Nothing, they slide in just fine
How do you inspect oil pressure screen?
Visual inspection
A yung sagot
What is the oil on the picture used for?
Used on break in
Hindi B yung tamang sagot
What is the oil on the picture used for?
Use on the SUMMER
Where are the marks on the connecting rods?
Stamped on the cap and the on rod.
What’s used to seal the carburetor to the sump?
Paper gasket
Should we reuse intake pipe flanged gasket?
Never reuse a gasket. Always replace it
What type of gasket is used on the intake pipe?
Two bolts flanged gasket
If you see a blue mark around the fuel nozzle, what is the cause?
100LL fuel leakage
How does a leaked from the intake pipe look like?
Blue stanning (because of the fuel) on the pipe
What tool is used to remove the rocker arm shaft?
No tool is used. Tap it out with your fingers
Why do you cut oil filter?
To inspect for metal particles
After cutting the filter, you find silver shining non-magnetic particle. Where does it come from?
Piston pins
Why are there two valve springs per the intake and exhaust Valve?
Only the intake has two springs
To get more spring bounce
To prevent valve float
Only has the exhaust two springs
How can intake leaks be found?
Blowing smoke into the carb intake and looking for the smoke to leave.
Pressure testing with soap and water using a shop vac designated for purposes
Using a vacuum tester
Pressure testing with suction and water using any shop vac available
How is an oil suction screen plug installed correctly?
Tighten until the gasket does not crush anymore
Tight then another 360 desgrees
Torque to 17 ft pounds
Tighten until sealing surfaces are in contact then another 135 degrees
How are the halves of the crankcase sealed?
By "00" silk thread sealant
By a cork gasket
By a silicon gasket
By a paper gasket
How do you know which cylinder a connecting rod will be used with?
The cylinder number will be stamped into the rod and cap bolt bosses
The cylinder number will be stamped into the rod small end
The cylinder number will scribed onto the side of the rod
The connecting rods can be used on any cylinder
Where is run out checked for on a crankshaft? #1
On the crankpin
On the aft main journal
On the front main journal
On the centre main journal
Where is run out checked for on a crankshaft? #2
On the front main journal
On the crankpin
On the propeller flange
On the aft main journal
How was run-out measured on the O200 crankshaft?
With a vernier calliper
With a transfer gauge and micrometer
With a dial indicator
With a micrometer
What is #10 pointing to?
Oil pressure screen
Oil pressure regulator assy
Oil suction screen
What is under this plug on the O320H engine?
Oil suction screen
Oil pressure screen
How does oil get from the cylinder head back down to the crankcase on the O200
Through the cylinder assy
Through the oil drain lines
Through the push rods shroud tubes
Through the pushrods
How would you know if a cylinder is nitrited?
It is marked orange & white
It is marked orange
It is marked blue
It is marked green
How was the wear on the gears in the accessory gearbox measured?
Using the 2 pin technique and a vernier calliper
Using feeler gauge
Using the 2 pin technique and a micrometer
Using the 2 pin technique and feeler gauge
On the O200 where does the oil go after the oil pump?
To the filter screen
To the LH main oil gallery
To the RH main oil gallery
To the pressure regulator
How often would you change the oil on this engine setup?
25 hrs of air time
25 hrs of flight time
50 hrs of air time
50 hrs of flight time
If the valve clearance on an engine with hydraulic lifters is found to be too large what corrective action would you take?
Replace the pushrods with a shorter one
Adjust the screw on the rocker arm
Heat up the push rod and stretch it
Replace the push rod with a longer one
When removing a cylinder what position should the piston be at?
Top dead center on the compression stroke
Any postion
Buttom centre on the power stroke
What kind of bearings are used in the engines we worked on in the lab?
Plain bearings, pressure lubricated
Plain bearings, splashed lubricated
Roller bearings, pressure lubricated
Roller bearings, splashed lubricated
What is it called when the proppeler flange on a crankshaft is bent forward or aft?
Run-out
Crooked
Normal
What are these parts called?
Crank front journal bearings
Thrust Washers
Thrust wedges
Prop spacers
What kind of tappets does the Lycoming O-235 engine have?
Solid Tappets
Hydraulic lifters
Solenoid tappets
Hydraulic tappets
What does this bunch of parts do in the engine oil system?
Control output pressure of the oil pump
Controls flow of oil to the filter
Controls oil pressure to the suction screen
Oil cooler bypass valves
What must be done to the connecting rods after a cylinder is removed?
Nothing they are just fine
They must be locked-wired to the base studs prevent movement
They must be solvent washed and lubricated using fresh 10W30 oil
They must be supported using elastics or cardboard templates
What kind of lifter would be used if this rocker was installed on a O235?
Hydraulic
Roller
Solid
Pneumatic
What part of the crankshaft is pointed to by A?
Rear main journal
Slinger ring
Propeller Flange
Crankpin
What part of the crankshaft is pointed to by B?
Crankpin
Slinger ring
Propeller Flange
Main Journal
What part of the crankshaft is pointed to by C?
Slinger Ring
Propeller Flange
Crankpin
What part of the crankshaft is pointed to by D?
Centre Journal
Slinger ring
Propeller Flange
Crankpin
What part of the crankshaft is pointed to by E?
Main Journal
Slinger ring
Propeller Flange
Crankpin
What part of the crankshaft is pointed to by F?
Flywheel/Propeller Flange
Slinger ring
Crankpin
Main Journal
What is it called when the propeller flange "wobbles" as it turns?
Normal
Run-out
Warped
Out of round
Why is it important to follow the correct torque pattern when reassembling a crankcase?
So the through bolts wont twist
So the camshaft bearings don't spin
So the crankcase wont crack
So the crankshaft is held and aligned properly in the case with its associated bearings
How are the halves of a crankcase aligned for assembly
By the crankshaft and camshaft
By the crank bearings
By the cylinder base bolts
By dowel pins
How is the accessory case aligned with the crankcase for assembly?
By the case bolts
By the through bolts
By the crankshaft and camshaft
By dowel pins
When are camshaft bearings replaced on the Lycoming O235 engine?
Whenever the case is opened
When the camshaft is replaced, they are matched parts
There are no camshaft bearings
Every 2000 hours of operation
How are the halves (outer halves on the O235 L2C) of a crankcase sealed?
By a cork gasket
By a silicone gasket
By a paper gasket
By "00" silk thread and sealant
Why is it important to follow the correct torque pattern when reassembling a crankcase?
So the through bolts wont twist
So the camshaft bearings don't spin
So the crankshaft is helf and aligned properly in the case with its associated bearings and so the crankcase will not crack
So the crank case half will be aligned
What is a ring stagger?
The spacing between the compression ring of a piston
The waviness in the oil control ring
The spreading out of the end gaps on the compression rings of a piston
When the rings don't roll straight across the work bench
What is used to seal the cylinder bases to the crankcase
A silicone gasket
A cork gasket
An o-ring
"00" silk thread and sealant
What is used to seal the rocker covers to the cylinder head? 2 right answer
RTV silicone
An o-ring
"00" silk thread and sealant
A cork gasket or silicone gasket
A cork gasket
Tool to remove rocker cover
Flat common screw driver
Tool to remove rocker shaft
No tool needed
How does oil get back to the crankcase from the cylinder head on the Lycoming engine?
Through the pushrod shroud tubes
Through dedicated cylinder drain lines
Through the pushrods
Through the oil return manifold system and a scavenge pump
What needed to be done to get the piston into the cylinder when installing the cylinder on the Lycoming engine?
A pry-bar must be used
A ring compressor must be used
Nothing, they slide in just fine
A hammer must be used to hit the piston really hard to get it back into the cylinder
What is the purpose of ring stagger?
To scrape excess oil off the cylinder walls
To prevent sideways movement of the connecting rod on the crankshaft
To prevent unwanted movement of the piston on the cylinder assy
To reduce leakage out of the combustion chamber
When are the seals/packings on a cylinder replaced?
Every time the cylinder is removed
At TBO
Every 500 hrs
At annual inspection
What adjustment is pointed to by B on this Continental fuel injection pump
Idle mixture
Idle speed
Low fuel pressure
High fuel pressure
If the idle was too slow on the aircraft what is the problem?
The idle mixture needs to be leaned (clockwise)
The idle screw needs adjustment out (counterclockwise)
The idle mixture needs to be richened (counterclockwise)
The idle screw needs adjustment in (clockwise)
What is the purpose of a case drain?
To allow excess oil in the engine to be vented overboard
To prevent fluids from mixing inside the engine
To return excess fuel from the fuel pump to the fuel tanks
To return excess fuel from the FCU to the fuel pump
What are the first steps one should take when trouble shooting a rough running fuel injected engine?
Clean finger screen and fuel nozzles
Check torque on the fuel nozzles
Adjust idle speed
Make adjustments to the high and low pressure sides of the fuel pump
What type of fuel injection system is the Continental?
Continuous flow
Direct injection
Throttle body fuel injection
High pressure fuel injection
Where would idle speed be adjusted?
At the fuel pump low pressure un-metered fuel adjustment
At the fuel pump high pressure un-metered fuel adjustment
At the idle mixture adjustment on the fuel metering unit
At the idle stop on the throttle body
What does a plugged fuel nozzle do to the indicated fuel flow?
It fluctuates up and down
It rises if using a fuel press transducer to convert press to flow
It drops
It drops to zero
What is likely problem if the engine runs fine at idle, but is running rough at higher power settings?
Blockage in the air side of the induction system
Dirty fuel nozzles
Contaminated fuel
Plugged fuel fliters
If a Continental fuel injection systems has a high mixture rise what needs to be adjusted?
Low unmetered fuel pressure
Low metered fuel pressure
Idle speed
Idle mixture
High metered fuel pressure
High unmetered fuel pressure
If the idle was too fast on the aircraft what is the problem? Continental fuel inj system
The idle mixture needs to be leaned (clockwise)
The idle screw needs adjustment in (clockwise)
The idle mixture needs to be richened (counterclockwise)
The idle screw needs adjustment out (counterclockwise)
What does a plugged fuel nozzle do to the indicated fuel flow?
It drops
It drops to zero
It rises if using a fuel press transducer to convert press to flow
It fluctuates up and down
How will the full flow external oil filter on a Lycoming engine be inspected?
By soap analysis
By sending it out to another company
By cutting it open and visual inspection
By magnetic particle-inspection
If a Continental fuel injection system is running rich at or near full what needs to be adjusted?
Pump pressure relief valve
Low unmetered fuel pressure
The variable orifice
Idle mixture
What is the purpose of the case drain on the engine driven fuel pump on the Continental fuel injection system?
To lubricate the pump shaft seal
To suck air into the pump
To drain the pump housing to check for water
To indicate if the pump has a leaking seal
What should be done to the aircraft before engine removal is started?
Lock the control locks
Close intake valves
Disconnect the aircraft battery for safety
Ground the aircraft for safety
What will be used to lubricate the oil filter seal before installation?
Clean engine oil
Nothing. It comes pre-lubricated
Used engine oil
5606 hydraulic fluid
How many times can the suction screen gasket be used?
On condtion when annealed
2 times when annealed
Once, it's a crush type gasket
3 times when annealed
What is the correct torque for the 172 engine mounts?
450-500 in-lbs
160-190 ft-lbs
160-190 in-lbs
450-500 ft-lbs
What is B
Drain plug
What adjustment is pointed to by A on this Continental throttle body?
Idle mixture
Idle speed
High metered fuel pressure
Low unmetered fuel presure
What is the part pointed to by A?
Fuel filter
Fuel pump
Throttle body
Injector nozzle
Which of the following tasks will require a dual inspection of the controls?
Adjustment of the idle mixture
Adjustment of the idle speed
Adjustment of the throttle cable length
Adjustment of the fuel pump pressure
If shiny metal particles are found in the suction screen that are magnetic where could they be from?
Camshaft lobes
Piston pin plug
Main bearings
Accessory gear bushings
What need to be done immediately after disconnecting the fluid line?
Disconnect all electrical wiring to the engine
They need to be cleaned and serviced
They should be removed and replaced
Cap and plug lines and fittings
What would be an indication that an intake gasket is leaking?
Blue staining around the intake tube flange
Blue staining around the cylinder base seal
They grey paint on the intake tube is peeling
Blue streaks on the aircraft windshield
How many bounce/cushion should there be in the 172 engine system according to the MM?
100 inch pounds of pressure
1/8 of an inch
7/8 of an inch
One and a half inches
Purpose of the spring
To bypass the oil filter if it gets clogged up
To increase oil flow at the filter
To increase oil pressure at the filter
To adjust oil pressure
What is a cylinder head made from? (Aircraft cylinder)
Machined aluminum
Steel
Cast Aluminum
What tools were used to measure the rocker boss on a cylinder
A micrometer
Vernier calipers
A transfer/telescoping gauge and a vernier caliper
A transfer/telescoping gauge and a micrometer
What type of fuel injection system is the Continental?
Continuous flow
Direct injection
Throttle body fuel injection
High pressure fuel injection
What is a cylinder barrel made from?
Cast aluminum
Cor-Ten steel
Stainless steel
Chrome Molybdnem Steel
What tool was used to measure the bore of a cylinder
A transfer gauge and a vernier caliper
A transfer gauge and a micrometer or a Bore Gauge
A micrometer
Vernier calipers
How would you know if a cylinder is chromed?
It is marked green
It is marked blue
It is marked orange & white
It is marked orange
What is pointed to by A?
Case drain
Fuel return from the FCU
Fuel return to the fuel tank
Fuel inlet
What is pointed on A
Vent
Fuel return to the FCU
Fuel return to the fuel tank
Fuel inlet
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