Rockwell Commander 112 - AUXILIARY FUEL PUMP; GASCOLATOR

Rockwell Commander 112

293 pages

Save Page as PDF

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

ROCKWELL

COMMANDER

112/B/TC/TCA

MAINTENANCE

MANUAL SECTION V

FUEL SYSTEM

i.

After

completion

of

preceding

steps,

calibra-

tion

should

be

correct,

if

not,

check

transmitter

float

arm

for

correct

down (empty)

position

as

shown

in

Figure

5-4,

and

correct

as

needed.

j.

If

system

is

still

out

of

calibration,

remove

and

replace

transmitter

and/or

indicator.

FUEL

FLOW

INDICATOR

MODELS

112/B.

A

manifold

pressuretfuel

flow

instru-

ment

is

installed

directly

in

front

of

the

pilot

in

the

instrument

panel.

Half

of

the

instrument

is

a

direct

reading

pressure

gage

calibrated

to

indicate

gallons

per

hour

of fuel flow.

The

gage

is

operated

by a

fuel

pressure

line

from

a

fitting

on

the

fuel

injector

flow

divider.

The

gage

is

marked

in

gallons

per

hour

from

4

to

20.5.

A

red

line

at

20.5

gallons

per

hour

and 12

psi

indicates

the

allowable

maximum

fuel flow

range.

Refer

to

Section

VIII

for

additional

information

and

maintenance.

MODELS

112TC/TCA.

A

manifold

pressuretfuel

pres-

sure

instrument

is

installed

directly

in

front

of

the

pilot

in

the

instrument

panel.

Half

of

the

instrument

is

a

di-

rect

reading

pressure

gage.

The

gage

is

operated

by

a fuel

pressure

line

from

a

fitting

on

the

carburetor.

I

The

gage

is

marked

in

psi

from

0

to

40.

A

red

line

at

30

psi

indicates

the

allowable

maximum

fuel

pres-

sure,

and

a

red

line

at

15

psi

indicate

s

the

allowable

minimum

fuel

pressure.

The

green

arc

between

15

•

and

30

psi

indicates

the

fuel

pressure

operating

range.

Refer

to

Section

VIII

for

additional

information

and

maintenance.

ENGINE PRIMER SYSTEM, MODELS 112TC/TCA

The

engine

primer

system

consists

of

an

electrically

operated

solenoid

valve

and

tubes

to

connect

the

aux-

iliary

fuel

pump

directly

to

cylinders

numbered

1,

2

and 3

of

the

engine.

Fuel

pressure

from

the

auxiliary

fuel

pump

is

utilized

to

introduce

fuel

directly

into

the

cylinders.

The

solenoid

valve

is

located

adjacent

to

the

auxiliary

fuel

pump

on

the

left

forward

side

of

the

engine

firewall,

and

is

controlled

by a

push

button

switch

labeled

PUSH TO PRIME which

is

located

on

the

center

console

adjacent

to

the

engine

controls.

The

engine

is

primed

by

turning

on

the

auxiliary

fuel

pump

and

momentarily

depressing

the

primer

switch.

Replacement

of

the

solenoid

valve

is

accomplished

by

disconnecting

and

capping

the

fuel

lines

and

discon-

necting

the

electrical

wiring.

Then

the

solenoid

valve

can

be

removed

by

removing

the

attaching

bolt

and

clamp.

Maintenance

and

disassembly

of

this

valve

is

not

authorized;

therefore,

servicing

of

this

valve

is

limited

to

removal

and

replacement.

AUXILIARY

FUEL

PUMP

The

electric

auxiliary

fuel

pump

is

located

on

the

forward

side

of

the

firewall,

and

is

controlled

by

a

two-position

rocker

switch

labeled

FUEL

PUMP.

Change 2

The

auxiliary

fuel

pump

is

used

as

a

boost

in

starting

and

may

be

used

in

the

event

of

engine-driven

fuel

pump

failure.

Replacement

of

the

auxiliary

fuel

pump

is

accomplished

by

disconnecting

and

capping

the

fuel

lines

and

disconnecting

the

electrical

wiring.

Then

the

pump

can

be

removed

by

removing

the

at-

taching

screws.

Maintenance

and

disassembly

of

this

pump

is

not

authorized;

therefore,

servicing

of

this

pump

is

limited

to

removal

and

replacement.

ENGINE-DRIVEN

FUEL

PUMP

An

engine-driven

fuel

pump

is

installed

on

the

acces-

sory

case

of

the

engine

and

is

provided

with a

relief

valve.

Refer

to

Section

IV

of

this

manual

for

a

de-

tailed

description

and

maintenance

procedures

for

the

fuel pump.

GASCOLATOR

Fuel

passes

through

the

fuel

selector

valve and

then

through

the

gascolator

where

it

is

filtered

prior

to

entering

the

electric

auxiliary

fuel

pump.

The

gasco-

lator

is

mounted

on

the

right

side

of

the

engine

fire-

walL

The

gascolator

screen

should

be

removed,

in-

spected

and

cleaned

every

100

hours

of

operation

or

sooner

if

improper

fuel

circulation

is

suspected.

To

clean

the

screen

proceed

as

follows:

GASCOLATOR SCREEN REMOVAL

MODEL

112

(Serial

numbers

thru

220).

a.

b.

c.

d.

5-5).

Master

battery

switch

-

OFF.

Fuel

selector

-

OFF.

Open

gascolator

and

drain

fuel.

Break

safety

wire

on

support

nut

(see

Figure

e.

Loosen

support

nut

on

base

of

gascolator,

and

SWing

wire

retainer

out

of

way.

f.

Remove

base

and

bowl

from

cover.

g.

Remove

screen

and

gaskets

and

discard

gaskets.

h.

Clean

screen

with

cleaning

solvent

and

dry

with

filtered

compressed

air.

i.

Inspect

screen

to

determine

serviceability

and

replace

screen

if

deformed

or

deteriorated.

MODEL 112

(Serial

numbers

221

and

subsequent)

Q

MODELS

112B/TC/TCA.

a.

Master

battery

switch

-

OFF.

b.

Fuel

selector

-

OFF.

c.

Drain

fuel

from

gascolator

by

pulling

tee

handle

fuel

release.

d.

Break

safety

wire

on

end

fitting

(see

Figure

5-5).

e.

Remove

end

fitting

and

plug.

L

Remove

housing.

go

Remove

screen

and

O-rings.

h.

Clean

screen

with

cleaning

solvent

and

dry

with

filtered

compressed

air.

i.

Inspect

screen

to

determine

serviceability

and

replace,

if

deformed

or

deteriorated.

5-5

Copyright Commander Owners Group 2013 All Rights Reserved

**unofficial copy**

Table of Contents