Rockwell Commander 112 - Page 75

Rockwell Commander 112

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SECTION

IV

POWER PLANT

AND

PROPELLER

MAINTENANCE MANUAL

ROCKWELL

COMMANDER

112/B/TC/TCA

MODELS

112/B

X242.

P-LEAD

CONNECTIONS

MODELS

112TC/TCA

X2427

Figure

4-2.

Magneto

-

Cam

End

View

c.

Disconnect

leads

from

magneto and

tag

for

identification when

reinstalling.

d. Remove

retaining

nuts and

washers,

and

remove

magneto

from

mounting pad.

NOIE

As the magneto

is

removed

from

its

mounting,

be

sure

that

drive

coupling

bushings do not

become

dislodged

from

the

gear

hub.

REPAIR

AND

LUBRICATION. Magneto maintenance

is

generally

limited

to

cleaning,

inspection,

and

re-

placement.

For

complete

magneto maintenance

pro-

cedures

and

authorized

repair

guidelines,

refer

to

the

Bendix Magneto

Service

Manual.

MODELS

112/B.

INSTALLATION

AND

TIMING.

The

magneto

must

be

installed

with

its

timing

marks

cor-

rectly

aligned.

Rotate

the

crankshaft

in

direction

of

normal

rotation

until

number

one

cylinder

is

on the

compression

stroke

and

approximately

35

degrees

be-

fore

top dead

center

(BTC).

4-4

I

WARNING

I

The

magneto

is

grounded through

the

ignition switch,

therefore,

any

time

the

primary

(switch)

lead

is

discon-

nected, the magneto

is

in

a

switch

ON

or

hot condition.

Before

turning

the

propeller

by hand,

remove

high

tension

cable

outlet

plate

from

magneto

or

dis-

connect

all

spark

plug

cables

to

prevent

starting

engine accidently.

Clamp

an

ignition

timing

pOinter on the advance timing

mark

on the

rear

of

the

starter

ring

gear.

The

starter

ring

gear

may be

marked

at

20 and

25

degrees.

Con-

sult

engine

nameplate

for

correct

advance

timing

mark

to

use.

Continue

rotating

the

crankshaft

until

the

tim-

ing

pointer

and the

parting

flange of the

crankcase

align.

Leave

the

crankshaft

in

this

position

until

the

magneto

is

installed.

In

the

event

that

an

ignition

timing

pointer

is

not

available

an

alternate

method

may be

used.

Rotate the

crankshaft

in

direction

of

normal

rotation

until

number

one

cylinder

is

on

the

compression

stroke

and continue

rotating

the

crank-

shaft

until

the

correct

advance

timing

mark

on the

rear

of the

starter

ring

gear

is

in

exact

alignment

with the

small

drilled

hole

located

at

the

two O'clock

position on the

front

face of the

starter

housing.

Leave

the

crankshaft

in

this

position

until

the

magneto

is

installed.

NOIE

The

advance timing

mark

is

specified

on

the

engine

nameplate.

Remove the

inspection

plug

from

the magneto and

ro-

tate

the

drive

shaft

in

direction

of

normal

rotation

un-

til

the

painted

chamfered

tooth on the

distributor

gear

is

aligned

in

the

center

of the

inspection

window. The

shaft

on

the

impulse

coupling

magnetos

can

be

turned

by depreSSing the pawl on the coupling. Be

sure

the

magneto

gear

does

not move

from

this

position and

secure

each

magneto

finger

tight.

The

magnetos

are

now

ready

for

final timing.

MODELS

112/B.

FINAL

TIWNG.

USing a

battery

powered

timing

light,

attach

the

positive

lead

to a

suitable

terminal

connected to

the

switch

terminal

of

the magneto and the negative

lead

to any unpainted

portion

of

the

engine. Rotate the magneto

in

its

mount-

Copyright Commander Owners Group 2013 All Rights Reserved

**unofficial copy**

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