Test 1 Flashcards
The complete disassembly, cleaning, inspection, repair, reassembly, & testing of an engine and its primary components
Engine Overhaul
2 Types of overhaul are:
Remanufactured Overhaul & Standard Overhaul
When would you usually refer to SB’s in reference to an overhaul?
Before overhaul/bulk inspection
What is the purpose of Internal Magneto Timing?
To set Efficiency Gap (E-Gap) position for most intense or Highest Energy Spark from the magneto
From the Pilot’s perspective, what direction is the propeller turning?
Clockwise
On a Differential Compression Test, where should the piston be?
TDC
On a Soap test, where should the Piston be?
BDC
On a Differential Compression Test, the engine should be ______ and ____ should still be in the engine
Warm, Oil
On a Differential Compression test, what precautions should be taken to prevent accidental firing of the engine?
Spark plug leads off and Magnetos grounded
The exhaust valve, in size, is the _________ valve, and is located on the side of the cylinder with ______ cooling fins
smaller, more
Ways to find the difference between Continental and Lycoming
Firing Order Colour Cylinder Numbering Data Plate Rocker Cover has Company Logo Push Rod Positioning
On Lycoming Engines, Push Rods Lie on ____
Top
How to time a magneto?
Adjust primary points to Open/Break primary circuit at point of highest intensity
What speed does the camshaft turn in relation to the crankshaft?
Half the speed
What speed does the Crankshaft turn in relation to the camshaft?
twice the speed
If you hear hissing during a compression test coming from the crankcase, where is the leak likely to be?
Piston Rings
What is a Crankshaft Throw composed of?
Two Cheeks and a Crank Pin
What kind of Piston is for Higher Compression ratio cylinders?
Dome Head
_________ Cylinder walls is an option to harden and reduce wear, using Ammonia at High Temperatures. This does not protect the cylinder wall from corrosion.
Nitrided
_________ _________ is a design used by manufacturers to account for the different operating temperatures at the top vs the bottom of the cylinder head in order to keep the cylinder perfectly round.
Cylinder Taper/Cylinder Wall Choke
__________ Cylinder Walls are used to provide resistance to corrosion
Chrome
After the engine speeds up on a start, the magneto is said to be at __________ ___ _________
Coming in Speed
What do the points of the magneto attach to?
The primary winding
What position should the engine be in when timing mag to engine?
Cyl 1- Before TDC, Compression Stroke
Where else can you hear hissing from a leak?
Carburetor, Exhaust
If there is hissing from a carb, where is likely the leak?
Intake manifold/valve
If there is hissing from an exhaust, where is likely the leak?
Exhaust manifold/valve
What are Crankshaft Journals used for?
Used to keep it in place in the crankcase
Where should the cylinder be during a compression test?
TDC
What prevents Lateral movement of the crankshaft?
Thrust Washer
*****Impulse coupling delays spark to prevent _________
Kickback
During compression testing, why do we want the engine oil to be warm, and full?
Seals the compression further
__________ Engines don’t need a separate oil drain line because the push rods provide the oil return
Continental
__________ is the act of etching in the cylinder wall to allow oil to adhere properly
Deglazing
The Cylinder barrel and the Cylinder head thread together via ______________ ______
Interference fit
What is one reason to carry out a major overhaul?
TBO is up
What position should the magneto be in when setting E-Gap?
Just after magnetic neutral position in the direction of rotation
If there is Green Paint below the sparkplug?
.010” Oversized inner surface
What does it indicate if there is Orange paint under the spark plug?
The inner surface is Chrome plated (Lycoming Engines)
What does Blue paint underneath the spark plug indicate?
Nitrided Barrel (Lycoming Engine)
What does Yellow paint under the spark plug mean?
.020” Oversize
What does Orange and white underneath the spark plug mean?
Cermichrome
What does Yellow paint on top of the spark plug reach mean?
Long Reach Plugs 13/16” Thread Depth
What does no paint on top of the spark plug reach mean?
Normal Reach, 1/2” Thread Depth
What does “oversize” stamped on the flange mean?
“.015” Oversize (Continental Engines)
What does orange on the flange mean?
Chrome Inner Surface (Continental Engines)
Why are piston pin caps made of soft aluminum?
To prevent damage to the inner part of the cylinder
In the Otto Cycle, what comes after the exhaust stroke?
Intake (with valve overlap)
What device limits the fwd/aft movement of the crankshaft?
Thrust Washer
Which side of the cylinder has more cooling fins?
Exhaust side
Which piston ring is optional?
Oil Scraper Ring
If there is no adjustment on the rocker arm, what may that indicate?
They are Hydraulic lifters
When you install a magneto, what position should the engine be in?
Number 1 Cylinder ,compression stroke, before TDC
When replacing pitted spark plug points, where should you check?
Capacitor
______ ___________ is when the poles allign with the pole shoes.
Full Register
__________ ____________ is used to increase hot spot under low RPM
Impulse Coupling
________ ____ ________ provides hot, late spark without impulse coupling. uses retard points to ignite at TDC to prevent kickback
Shower of Sparks
When doing a differential pressure test, make sure engine is _______ and there is ____ still in the engine
Warm, oil
What is remanufactured overhaul?
Engine components returned to “original specs”
_____________ holds all the engine parts in alignment and supports the cylinder and crankshaft, constructed of aluminum alloy
Crankcase
Why might you do a bulk inspection?
Abnormality eg// prop strike, submerged engine
What does the impulse coupler do?
Delays the opening of the primary breaker points
What is Standard Overhaul?
Restoring to service limits
What are the breaker points connected to?
Primary coil
_________ Cylinder Walls are hardened to reduce wear but still rust as easily as plain steel walls (Exposes cylinder wall to ammonia at high temperatures
Nitrided
_________ Cylinder walls - chromium plating used to resist wear and provide corrrosion resistant surface
Chrome
When the magnetos are past the starting point, it is called the _________ ____ ________
Coming in Speed
____ ________ _______ are designed to maintain the thickness of the oil film on the cylinder wall
Oil Control Rings
How are the barrel and cylinder head attached?
Interference fit
How do you adjust length with Hydraulic Lifters?
Adjust length of push rod
