Creative Engineering ROCK-A-FIRE EXPLOSION - Page 115

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Props

and

Looney

Bird

F.

Looney

Bird's

Head

Turn

Mechanism:

(See

Drawing

Page

3-088)

The

Head

Turn

mechanism

is

simple

and

should

have

few

problems.

The

front

mount

of

the

Head

Turn

mechanism

(Actuation

Lever)

,

has

used

two

types

of

lever.

One;

is

a

steel

plate

welded

to

a

shaft

collar,

that

is

drilled

and pinned

to

the

neck

shaft.

In

the

case

of

the

steel

plate,

the

Head

Turn

cylinder

attaches

using

a

Clevis

and

Fas-Pin.

Two: The

newer

block,

is

a

machined

Steel

block

that

clamps

on

to

the

neck

shaft.

In

the

case

of

the

machined

steel

block

the

cylinder

attaches

using

a Rod End

and

Aircraft

Bolt.

1.

If

the

Roll

Pin

attaching

the

Actuation

Lever

to

the

neck

shaft

breaks:

a.

Align

the

holes

and

tap

out

the

broken

Roll

Pin,

using

a

steel

pin

and

Hammer.

b.

Tap

in

a new

roll

pin,

the

same

size

as

the

one

you

removed.

c.

If

the

same

size

Roll

Pin

won't

fit

because

the

hole

is

oversized,

Drill

out

the

hole

1/64"

under

the

size

of

the

next

larger

Roll

Pin.

Tap

in

the

new

larger

Roll

Pin

and

set

the

Critical

Adjustments.

2.

If

repairing

the

Roll

Pin

is

impossible,

replacement

of

the

Actuation

lever

is

required.

Also,

if

the

lever

must

be

replaced

then

the

Lower

Neck

Shaft

probably

needs

replacement.

a.

Tap

out

the

Roll

Pin,

loosen

the

set

screws

in

the

Pillow

Blocks

and

Actuation

Lever.

b.

Remove

the

2

piece

Clamping

Collar,

and

remove

the

head

and

upper

neck

shafts.

c.

Re-assemble

the

mechanism

using

the

new

neck

shaft

and

Actuation

Lever.

Tighten

the

Pillow

Blocks

to

the

shaft

and

re-attach

the

head

and

upper

neck

assembly.

Do

not

tighten

the

new

Actuation

Lever

on

the

neck

shaft,

it

needs

to

be

loose

in

order

to

set

the

Critical

Adjustments.

d.

Replace

the

cylinders

front

mount

Clevis,

for

a

3/8"

Rod

End.

Do

not

tighten

down

the

Jam

Nut.

e.

Re-attach

the

cylinder

to

the

Actuation

Lever,

using

a

3/8"

x

15/16"

Aircraft

Bolt,

#/8"

Self

Locking

Nut

and

a

3/8"

Washer.

(See

Drawing

Page

3-088)

3.

If

the

rear

mount

Collar

Pin

for

the

head

turn

cylinder

breaks,

replacement

is

required.

4.

After

any

repair

work,

refer

to

Pages

3-094

thru

3-135,

Critical

Adjustments.

3-Q78