Rockwell Commander 112 - Induction Air Filter; Induction Air System; Spark Plugs

Rockwell Commander 112

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SECTION

IV

POWER PLANT

AND

PROPELLER

MAINTENANCE MANUAL

ROCKWELL

COMMANDER

112/B/TC/TCA

FIRING

ORDER

1-3-2-4

MODELS

112/B

MODELS

112TC/TCA

TOP

VIEW

NO.4

UPPER

NO.1

LOWER

LEFT

DISTRIBUTOR

NO.2

UPPER

NO.3

LOWER

RIGHT

DISTRIBUTOR

NO.3

UPPER

t-+((l]L((~I)}\--j

NO.1

UPPER

NO.2

LOWER

NO.4

LOWER

TYPICAL

BOTH ENGINES

X243A5

Figure

4-3.

Ignition

Wiring

SPARK

PLUGS

Two

spark

plugs

are

installed

in

each

cylinder

and

thread

into

heli-coil

inserts.

The

spark

plugs

are

shielded

to

prevent

ignition

interference

from

enter-

ing

the

radio

and

have

an

internal

resistor

to

provide

longer

terminal

life.

An

average

life

of 200

hours

may

be

expected

from

these

spark

plugs;

however,

this

will

vary

with

operating

conditions.

Ground

operation

of

the

engine

for

extended

periods

or

an

excessively

rich

idle

mixture

will

shorten

spark

plug

service

life.

A

spark

plug

that

is

kept

clean

and

pro-

perly

gapped

will

give

better

and

longer

service

than

one

that

is

allowed

to

collect

lead

deposits

and

is

im-

properly

gapped.

The

spark

plug

gap

should

be

set

in

accordance

with

Lycoming's

latest

publication

of

Service

Instructions

Number

1042.

The

spark

plug

torque

value

is

360 to 420

inch-pounds.

When

the

engine

leaves

the

factory

it

is

equipped with

spark

plugs

as

specified

in

Figure

4-12.

INDUCTION

AIR SYSTEM

MODELS

112/B.

The

external

scoop on

the

left

side

of

the

cowling

serves

as

the

ram

air

source

for

the

in-

duction

air

system

(see

Figure

4-4).

Intake

air

is

di-

rected

through

an

oil-impregnated

filter

element

and

flexible

ducts

for

delivery

to

the

induction

air

box.

The

air

box

then

directs

the

filtered

air

to

the

fuel

4-6

injector

unit

for

the

fuel/air

mixing

process.

A

sec-

ond

(heated)

air

source

is

connected

to

the

induction

heat

outlet

of

the

muffler

assembly

and

routed

to

the

induction

air

manifold.

This

provides

an

alternate

source

of

intake

air

in

the

event

of

fuel

injector

noz-

zle

impact

icing,

or

icing

of

the

external

filter

ele-

ment.

This

heated

airflow

source

is

controlled

by

the

induction

air

control

lever

on

the

engine

control

pedestal.

MODELS

112TC/TCA.

The

external

scoop

on

the

right

side

of

the

cowling

serves

as

the

ram

air

source

for

the

induction

air

system

(see

Figure

4-4).

Intake

air

is

directed

through

an

oil-impregnated

filter

element,

induction

air

box,

and

flexible

ducts

for

delivery

to

the

turbocharger.

The

air

is

compressed

and

delivered

to

the

carburetor

for

the

fuel/air

mixing

process.

A

second

(heated)

air

source

utilizes

engine

cooling

air

drawn

from

the

interior

of

the

lower

engine

cowl.

This

provides

an

alternate

source

of

intake

air

in

the

event

of

carburetor

icing,

or

icing

of

the

external

filter

ele-

ment.

This

heated

airflow

source

is

controlled

by

the

induction

air

control

lever

on

the

engine

control

pedestal.

INDUCTION

AIR

FILTER

MODELS

112/B.

The

induction

air

system

utilizes

a

flock-coated

induction

air

filter.

The

filter

element

is

installed

in

the

filter

housing

located

on

the

lower

left

side

of

the

cowling

near

the

firewall.

Refer

to

Sec-

Copyright Commander Owners Group 2013 All Rights Reserved

**unofficial copy**

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