Power Plant 3-6
Where will you find the specifications for the oil used in the O320H engine?
O320 operator manual, section 3-8. Or TCDS, Aircraft MM
FAA regulations
Maintenance logbook
Pilot's operating handbook
Manufacturer's website
What oil will be used during an Ontario summer (be specific)?
SAE 50 for above 60F.
SAE 10W-30
SAE 5W-20
SAE 15W-40
SAE 20W-50
What oil will be used during break in (be specific)?
Mineral oil designated with “M”.
SAE 20W-50
Vegetable oil
Olive oil
Canola oil
How often are the oil drain plug gaskets replaced?
After every oil change
Once a year
Every 10,000 miles
Only when the oil drain plug is damaged
Every other oil change
What is the torque for the oil pump suction screen crush gasket?
Turn the plug till the crush gasket touches the surface then turn it an additional 135 degrees.
Turn the plug until the crush gasket touches the surface then turn it an additional 90 degrees.
The torque for the oil pump suction screen crush gasket is 50 ft-lbs.
Rotate the plug until the crush gasket makes a full revolution.
The torque for the oil pump suction screen crush gasket is 10 Nm.
What will the seal on the oil filter be lubricated with?
Engine oil.
Grease
Silicone lubricant
Teflon spray
WD-40
What kind of seal is used on the oil sump drain plug?
Crush gasket.
Rubber O-ring
Nylon washer
Copper gasket
Fiber seal
Silicone O-ring
How would you find an oil leak on an aircraft engine?
Shut down the engine, perform a groundrun for a couple minutes, then visually inspect for leaks
Check the fuel gauge for any abnormalities
Listen for any unusual noises coming from the engine
Inspect the landing gear for signs of oil leakage
Perform a pressure test on the aircraft tires to detect oil leaks
How would you adjust oil pressure if it was too low on a Lycoming O-320H engine?
If it’s a non-adjustable valve, add/remove washers.
Replace the oil filter
Add more oil to the engine
Clean the oil pump screen
Check the oil pressure gauge for accuracy
How would you adjust oil pressure if it was too high on a Lycoming O-320H engine?
To DECREASE: Turn the pressure relief valve OUT (COUNTER CLOCKWISE).
Increase the oil flow rate
Adjust the oil temperature
Replace the oil filter
Add more oil to the engine
When would you change the oil on an engine?
Spin-on oil filter: Every 50 hours or 4 months. Oil pressure screen: Every 25 hours or 4 months.
Every 100 hours or 6 months
Once a year or every 10,000 miles
Only when the engine starts making strange noises
When the oil turns black
When would you change the oil filter/screen on an engine?
Paper filter: Every oil change or on condition. Screen itself: Only if it’s broken, otherwise just clean and reinstall after every oil change.
Change the oil filter/screen every 10,000 miles
Only change the oil filter/screen if the engine starts making a strange noise
Clean and reinstall the oil filter/screen every other oil change
Change the oil filter/screen every 2 years
What oil would be used in this engine?
Straight mineral, ashless dispersant, or multi-grade are all good. There were many answers for this. Above 60F = SAE 50 0F-70F = SAE 30
SAE 40
Synthetic blend
Ash-based dispersant
SAE 20W-50
How often will the filter and suction screen be inspected on this engine?
During every oil change (25 hours, 50 hours, or 4 months). Generally clean and inspect every 50 hours.
Inspect the filter and suction screen every 100 hours
Clean and inspect the filter and suction screen every 6 months
Check the filter and suction screen during every tune-up
Inspect the filter and suction screen annually
How often will the suction screen gasket be replaced on this engine?
Everytime you remove the screen
Once a year
Every 10,000 miles
After every oil change
Only when the engine is overheating
Where will you find the specifications for the oil used in the O320H engine?
- O-320H (76 Series) Operators Manual - Overhaul Manual
Maintenance Manual
Service Bulletin
Parts Catalog
Aircraft Flight Manual
What oil will be used during an Ontario Summer (be specific)?
SAE 40 (thicker)
SAE 30
10W-30
5W-20
15W-40
What oil will be used during an Ontario Winter (be specific)?
SAE 20 (thinner)
SAE 5W-30
SAE 10W-40
SAE 15W-40
SAE 0W-20
What oil will be used during break in (be specific)?
- Mineral
Synthetic blend
Vegetable oil
Olive oil
Coconut oil
How often are the oil drain plug gaskets replaced?
Every oil change (one-time use only)
Every 10,000 miles
Once a year
Only when the oil filter is replaced
After every 100 hours of engine operation
What is the torque for the oil pump suction screen crush gasket?
Tighten until sealing surfaces are in contact, then tighten additional 135
Tighten until sealing surfaces are in contact, then tighten additional 90.
Torque specifications are not applicable for the oil pump suction screen crush gasket.
The torque for the oil pump suction screen crush gasket varies depending on the engine model.
Hand-tighten the oil pump suction screen crush gasket without applying any specific torque.
How much oil will you put into the O320H engine when doing an oil change?
- Min. Safe qty. In sump →2 qts. (US) - Max. Sump capacity →6 qts. (US) - **Operate @ 5 qts.
1.5 qts.
3 qts.
8 qts.
10 qts.
What will the seal on the oil filter be lubricated with?
- Engine Oil - DC4
Grease
Silicone lubricant
WD-40
Transmission fluid
How often do you change engine oil if the engine has a paper filter?
50 hrs
Every 100 hours
Once a year
After 500 miles
When the engine starts making noise
How often do you change the engine oil if it has a pressure screen only?
25 hrs
50 hrs
100 hrs
Every 6 months
When the oil turns black
What kind of seal is used on the oil sump drain plug?
Copper Crush Gasket
Rubber O-Ring
Aluminum Washer
Nylon Gasket
Steel Shim
What is the P/N for the intake flange gasket?
71971
71972
71970
71973
71969
What is the intake flange gasket made from?
Paper impregnated with silicone.
Rubber
Cork
Fiberglass
Plastic
Can you reuse the intake flange gasket?
No. Replace it everytime
Yes, as long as it is still in good condition
Only if it has been cleaned thoroughly
It can be reused up to three times before replacement
Reusing the gasket actually improves engine performance
What is the intake pipe (tube) made from?
Steel.
Aluminum
Plastic
Copper
Rubber
What is placed between the carburetor and oil sump?
A carburetor gasket (paper impregnated with silicone).
A rubber seal
A metal spacer
A plastic shim
A cork gasket
Where can the induction system leak?
Around the hoses, flanges, or any other mating parts.
At the air filter
Inside the engine block
In the exhaust system
At the throttle body
Where is the induction system most likely to leak?
The carburetor gasket
Intake manifold
Throttle body
Air filter housing
Fuel injector seals
How can induction system leaks be found
Visually inspect for blue leaks (100LL fuel dye). You can also spray the exterior with soapy water and pressurize it. If the pipes bubble, a leak is present
Use a stethoscope to listen for any hissing sounds indicating a leak
Perform a smoke test by introducing smoke into the induction system and looking for any escaping smoke
Check for any visible cracks or damage on the exterior of the induction system components
Measure the air pressure inside the induction system using a pressure gauge and look for any significant drops indicating a leak
When would you inspect an induction system?
If the system is running rough or the engine cannot achieve max power. Otherwise during overhaul, bulk inspection, or when cowls are off.
During routine maintenance
When there is a decrease in fuel efficiency
After a long period of storage
If there are unusual noises coming from the engine
What are you looking for when inspecting an induction system?
Blue stains indicating leaks, damage, corrosion, and debris/blockage.
Rust on the exterior of the induction system
Excessive noise coming from the induction system
Visible cracks in the induction system components
Unusual odors emanating from the induction system
What can happen to the engine if there is an induction leak at the carb to sump mating surface?
All the cylinders will run lean. The engine will be less efficient
The engine will run rich in all cylinders
The engine will produce more power
The engine will have better fuel economy
The engine will run smoother
What damage can be caused to a cylinder if an intake tube is leaking?
Stuck valves, overheated valves, detonation, cracks in cylinder
Decreased fuel efficiency
Loss of compression
Uneven air-fuel mixture
Excessive carbon buildup
What color could the spark plugs be on a cylinder with a leaking induction tube gasket or hose?
White as all the dirt will have burned off
Blue due to oil leakage
Black from excessive fuel consumption
Yellow indicating a rich fuel mixture
Green as a result of coolant contamination
What is the intake flange gasket made from?
Synthetic Fibre (Polychloroprene Binder aka Neoprene) [handles heat well]
Rubber
Cork
Silicone
Fiberglass
Can you reuse the intake flange gasket?
No
Yes, as long as it is cleaned thoroughly before reinstallation.
No, but you can use a sealant to patch any leaks.
Yes, if you apply a layer of silicone spray on both sides of the gasket.
No, unless you heat it up with a blowtorch to restore its flexibility.
What is the intake pipe (tube) made from?
Steel
Aluminum
Plastic
Copper
Rubber
Where is the induction system most likely to leak?
Flange (weakest link)
Air filter
Throttle body
Intake manifold gasket
Vacuum hose
How can induction system leaks be found?
System pressure test (using low pressure via separate vacuum or shop air)
Visual inspection of the induction system
Using a smoke machine to detect leaks
Checking for abnormal engine performance
Listening for hissing or whistling sounds near the intake manifold
How is the air flow controlled in the induction system?
Carburetor / butterfly valve
Mass air flow sensor
Throttle body
Intake manifold
Air filter
What techniques can be used to measure gear wear?
Bell 47 Planetary gears: The “two-pin” technique with a micrometer O235: Measure backlash with feeler gauge
Using a magnifying glass to inspect the gear teeth
Measuring the gear wear by counting the number of rotations
Checking the gear wear by listening for unusual noises during operation
Estimating gear wear based on the age of the gear
How is wear measured on a gear with an even number of teeth?
Two-pin technique
By counting the number of teeth on the gear
Using a laser to measure the depth of each tooth
By analyzing the sound produced when the gear is in motion
Measuring the temperature of the gear after prolonged use
How was wear measured on a gear with an odd number of teeth?
Also the two-pin technique
Wear on a gear with an odd number of teeth cannot be accurately measured
Wear is determined by counting the number of rotations the gear has made
Wear can be measured by observing the color change of the gear surface
Wear is measured by analyzing the sound produced by the gear during operation
What kind of oil is used to lubricate piston engine accessory gears
Engine oil.
Transmission oil
Hydraulic oil
Gear oil
Brake fluid
What kind of oil is used to lubricate the Bell 47 planetary gears?
Ideal and high.
Synthetic oil
Mineral oil
Vegetable oil
Motor oil
What kind of wear pattern is on the planetary gears?
Ideal.
The wear pattern on the planetary gears is spiral
The wear pattern on the planetary gears is radial
The wear pattern on the planetary gears is concentric
The wear pattern on the planetary gears is irregular
Where can the accessory gearbox leak
Through the accessory housing seals and oil pump housing mating surfaces.
Through the accessory drive shaft
From the input shaft seal
Due to a crack in the gearbox casing
Via the oil drain plug
How is the accessory gearbox sealed?
With a paper seal.
With a rubber seal
By using a magnetic seal
Through an adhesive sealant
Using a heat-sealed plastic cover
When would you inspect the gears in an engine?
Every 600 hours, 1200 for overhaul or bulk inspection.
Every 500 hours
Only during routine maintenance
When the engine is running smoothly
Once a year
What oil would be used to lubricate the accessory gears?
Pressure to the axle then SPLASH to the gears
Motor oil
Transmission fluid
Grease
Hydraulic oil
How would the oil be distributed to planetary gears?
It’s sprayed on top then splashes down/in.
The oil is injected through a small tube directly into the center of the planetary gears.
A conveyor belt system carries the oil to each individual planetary gear.
The oil is distributed by a network of tiny pipes that connect to each planetary gear.
A robotic arm applies the oil to each planetary gear with precision.
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