CHAPTER 1A

53問 • 2年前

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Radial engines have appeared in two forms: the __________-radial and the __________-radial.

rotary, static

The __________ __________-type engine has two banks of cylinders directly opposite each other with a crankshaft in the middle.

horizontally opposed

Horizontally opposed engine crankcases are usually cast from _______________ alloy.

aluminum

Many crankcase halves are sealed using a thin coat of non-hardening gasket compound and a __________ __________.

silk thread

The three main parts of a crankshaft are the a. ___________________. b. ___________________. c. ___________________.

journal, crank pin, crank check

6. The outer surface of the crankpins and journals are hardened by __________.

nitriding

A crankshaft is checked for _______ (static or dynamic) balance by placing it on knife edges and observing any tendency to rotate.

Static

To reduce vibration to a minimum during engine operation __________ __________ are incorporated on the crankshaft.

dynamic dampeners

What are the three types of bearings in general use? a. ___________________. b. ___________________. c. ___________________.

plain, ball, roller

The crankshaft usually rotates in __________ bearings

plain

The ____________________ __________ is the link which transmits forces between the piston and the crankshaft.

Connecting Rod

The connecting rod attaches to the of the _______ _______ crankshaft.

crank pin

. What are the three types of connecting rod assemblies? a. ___________________. b. _________________. c. _______________.

plain, fork and blade, master and articulated

The __________-type connecting rod is used on horizontally opposed engines

plain

The ____________________ __________ ____________________ rod assembly is used in radial engines.

master and articulated

The ____________________ pins connect the articulating rods to the master rod

knuckle

Most aircraft pistons are machined from ____________________ alloy forgings.

aluminum

most pistons are made of high-grade _________ ___________.

cast iron

The top rings installed on an aircraft piston are called the ____________________ rings

compression

The piston ring below the compression rings is called the ____________________ ring.

oil control

The piston ring at the bottom of the piston skirt is called the ____________________ ring.

oil scrapper

The piston pins used in modern aircraft engines are the ____________________- ____________________ type.

fuel floating

Another name for a piston pin is a ____________________ pin.

wrist

Oil control rings regulate the ____________________ of the oil film on the cylinder wall.

thickness

The cylinder assembly is composed of two major parts: a. ____________________. b. ____________________.

cylinder head, cylinder barrel

A __________ bore cylinder is one where the bore is ground so that the diameter at the top portion of the barrel is slightly smaller than the diameter of the main part of the barrel.

choke

7. The two methods commonly used to harden cylinder walls include: a. ____________________. b. ____________________.

chrome plating, nitriding

Cylinders which have been chrome plated are identified by ____________________ (what color) paint.

orange

Cylinders which have been nitrided are identified by ____________________ (what color) paint.

blue

____________________ (Nitrided or Chrome plated) cylinders are very susceptible to rust and must be kept covered with a preservative oil.

Nitrided

Cylinder heads of air-cooled engines are generally made of ____________________ alloy.

Aluminum

Heat is transferred away from the cylinder head through __________ __________ cast into the head.

cooling fins

There is a greater depth and area of cooling fins on the ____________________ (exhaust or intake) side of an air-cooled cylinder head.

exhaust

The propeller shaft end of an aircraft engine is always the __________ (front or rear) end, regardless of how it is mounted in the aircraft.

front

When referring to the right or left side of the engine, always assume you are viewing it from the __________ (front or rear).

rear

The heads of poppet valves come in four shapes including: a. ____________________. b. ____________________. c. ____________________.

mushroom, tulip, semi tulip

Hollow exhaust valves may be partially filled with ____________________ (what material) to aid in their cooling.

sodium

Valve __________ is the distance that valve is lifted off its seat.

lift

Valve ____________________ is the length of time that valve is open.

duration

The valve mechanism of a horizontally opposed engine is operated by a cam __________.

shaft

The camshaft on a horizontally opposed engine rotates at __________ the crankshaft speed.

1/2

The two types of valve lifters used in aircraft engines include: a. ____________________. b. ____________________.

solid, hydraulic

The __________ __________ transmit the movement of the cam follower to the rocker arm.

push rods

One end of the __________ __________ bears against the push rod and the other against the valve stem.

rocker arms

The valve mechanism of a radial engine is operated by one or more cam ____________________.

rings

A four-lobe cam ring on a nine-cylinder radial engine will turn at ____________________ the crankshaft speed.

1/8

Hydraulic valve lifters are also known as ____________________ ____________________ lifters.

zero lash

The running valve clearance of hydraulic valve lifters is ____________________.

zero

The direction of rotation between a propeller shaft and the crankshaft in an engine using a planetary gear reduction system is ____________________ (the same or opposite).

the same

An aircraft engine having a planetary gear system using an 80 tooth bell gear driven by the crankshaft and a fixed 62 tooth sun gear will have a gear reduction of __________:1. This is the same as 16:__________.

1.775, 9

Three types of attachments for a propeller to an aircraft engine crankshaft are: a. ____________________. b. ____________________. c. ____________________.

tapered, splined, flange

____________________-type propeller shafts are used on most modern horizontally opposed aircraft engines.

flange

Indicate what is meant by each letter or number in the following engine designations. R-985 1. R = ____________________. 2. 985 = __________________.

radial engine

chapter1b

Dorian Pinuellas · 31問 · 2年前

chapter1b