OFNA Racing CD3 RTR User Manual

CD-3 SPORT RTR and PRO RTR
ASSEMBLY INSTRUCTIONS

REQUIRED FOR OPERATION

THINGS NEEDED

Glow Fuel

20%

AA Batteries ( 12 pcs )

You will need to buy a few items to start the engine and run the car.

• Use 20% nitro CAR fuel. Do not use airplane or helli fuels, they will
over heat engine.

• Buy SHORT glow plugs, OFNA/PICCO Plu (#51007 or 51008) are
long therefore use two copper washers. Use plugs without idle bar.
Always use two copper washers with Picco glow plugs.

In your box you will find..

• #10163 - 250cc Fuel Bottle

• #10219 - Red “D” size glow heater
These parts change depending on stock!

You need to get batteries for the radio transmitter and the car receiver
packs.

• Radio TX needs (8) eight AA batteries.

• Car needs (4) four AA Ni-cad batteries, Alkaline type batteries will
work, but braking will be reduced. The best is to use a 5 cell hump
pack for increased voltage..

Recommended Option:

#10212 NiHm Hump Pack,
see charger 10214.

TOOLS NOT INCLUDED IN KIT,
BUT NEEDED TO MAINTAIN YOUR CAR.

Phillips Type Screw Drivers ( L )

Phillips Type Screw Drivers ( S )

Needle Nose Pliers

You may want to upgrade the car battery pack to a Ni-Cad or NiHm 5
cell type(600AE). This will give more run time. OFNA #10212

Cutter

Curved Scissors

Instant Cement

Cross Wrench
#17109 $3.95

10214
Over-nite
Charger

Diff Oil ­Silicone

Knife

Glow Plug & 17MM Cross Wrench
#10801 $6.95

MUST READ THIS BEFORE RUNNING

Running a nitro kit is fun and easy, but to make this a safe rusting.
and good experience you must observe a few rules. This
kit is extremely fast, easily over 40MPH, and can seriously
injure someone if you are not careful.

Where to run car?

• Any running area you choose must be dry. Do not run
car near any water or wet dirt.

• Do not run on public streets. It is very easy to have the
car run over or damaged by hitting the curb.

• Do not operate car in tight confined places. The car is
very fast and will easily hit something.

• Do not run near people or animals.
and will too easily hit someone.

• Due noise, you will want to consider the surrounding
area when operating the car.

• Do not operate the car at night. You will not be able to
drive it without hitting something.

• Do not operate the car indoors. Engine exhaust is not
healthy.

Glow Fuel

• Glow fuel is poisonous!

• Glow fuel is flammable!

• Do not leave in fuel bottle with lid off at any time. label for additional precautions.

• Do not use any fuel other than glow fuel in this engine.

First Time Starting the Engine

Caution! When starting engine make sure the following is
observed. • Always turn off the car BEFORE turning off radio.

• Set engine Master needle to 3 turns (rich setting)

• Do not do this alone, get an experienced friend to help at • DAMAGE DUE CAR RUN AWAY IS NOT A WARRANTY
first. ISSUE.

• Fill fuel tank, try not to spill fuel. Do not spill fuel on
receiver

• Hold car off the ground, so it will not runaway when first
starts

• Turn on Radio and check the linkage before starting
engine.

• Turn on car receiver battery switch.

• Always have an air filter on the carburetor to keep dirt
out.

Engine Break-in

• See Engine Page.

The car is very fast

• Clean oil and dirt from chassis with a degreaser.

Precautions

• This kit is not a toy. Always run car with a second
person as a spotter and pitman.

• Hot Parts - The pipe, manifold, engine and head are very
hot and will cause burns.

• Rotating Parts - Keep hands away from the drive train,
wheels, and engine when engine is running.

• Radio - Check batteries life before running the car. If
radio does not have full control of the car with steering
and/or throttle/brake do not run until corrected. Failure to
correct this will result in possible injury and damage to the
car or property.

• Glow fuel - Do leave the glow fuel unattended with the lid
off. Fuel contains Methanol and Nitro Methane and is
flammable and poisonous.

Store fuel in cool ventilated location. Refer the glow fuel

• Car Fuel tank - Never store fuel in car tank, it will ruin the
engine if left in tank.

IF YOU DO NOT BREAK-IN ENGINE
CORRECTLY, MAINLY AT LOW RPM,
YOU WILL BREAK THE CONNECTING
ROD!

FAILURE TO NOT READ AND
FOLLOW BREAK-IN ENGINE

Emergency Stopping Engine When Running

• Remove air filter and cover carb. intake.

• Squeeze fuel line and hold until engine stops.

• With a rag, cover exhaust outlet.

Storing Car After Running

• Remove fuel from tank and fuel lines

• Turn off radio in car

• Put a few drops of after run in engine to keep it from

INSTRUCTIONS WILL VOID
WARRANTY!

CHECK RADIO SETTING AND
LINKAGE BEFORE STARTING

ASSEMBLY OF THE DIFFERENTIAL
(Build two differentials for front and rear.)

90020

94052

M2x7mm

Flat Head
Screw

2.5mm
E-Ring

38278

5x8x1.5mm

O-Ring

38632

5x10mm

Washer

38256

Diff.Gear

(small)

Diff.Gear

(Large))

37771

37450

10x15x4mm

Bearing

38253

3x17.8mm

Pin

Step 1

90020

E-Ring

2.5mm

Step 3

38256

10T Diff.Gear
(small)

37771
13T

Diff.Gear

38253
3x17.8mm
Pin

38632
Washer

5x10mm

38256

38278
5x8x1.5mm
O-Ring

10T Diff.Gear
(small)

38252

Diff.Case

37450
10x15x4mm
Ball Bearing

94052
M2x7mm
Flat Head

Screw

38255
Cap Joint

38255

Cap Joint

Step 2

Step 4

37450
10x15x4mm
Ball Bearing

38278
5x8x1.5mm

O-Ring

38287

Diff.Gasket

38632

5x10mm
Washer

38257
Large

Bevel Gear

90020

2.5mm
E-Ring

37771

13T
Diff.Gear(Large)

Put the grease
into the diff.
case before
assembly.

ASSEMBLY OF THE GEAR BOX

(Build two gear box for front and rear.)

*Adjust the backlash

with the shim*

38254
12x15x0.25mm
Shim

Note: Follow the instruction
to put the correct shim
in the right place.

38251
Gear case

90020

2.5mm
E-Ring

38633

5x8x0.8mm
Washer

2.5mm
E-Ring

90020

37430
5x11x4mm

Ball Bearing

38519
Bevel Gear

Cap Joint (R)

37430
5x11x4mm
Ball Bearing

37340
5x11x4mm

38258
16T Bevel Gear
(small)

Ball Bearing

38258

16T Bevel Gear
(small)

38526
Bevel Gear
Shaft (small)

* For the good gear mesh,
put the 5x8x0.8 washer
between L-06 and E-43.

Bevel Gear
Shaft (small)

38530
Steel Ring
(For Front Plastic
Cap Joint)

38526

38519

Bevel Gear
Cap Joint (F)

37400
2x8.8mm

Pin

To test the effectiveness of the gear
differential, hold the gear tightly with one
hand and turn one cap joint.

Does the other cap joint move in the
opposite direction and smoothly?

¡¯CHECKI NG YOUR DI FFE RENT I AL

ASSEMBLY

If gear differential does not move smoothly,
assemble the gear diff. once again.

94001
M3x4mm
Screw

* Put the gear in the
right position.

ASSEMBLY OF THE FRONT GEAR BOX
(Builds a gear box for the front.)

* Note: Do not over tighten the

2.6x10mm hex screw as it
may cause damage to the
hole in plastic.

94050

2.6x10mm
Hex Screw

38251
Gear Case

94004

M3X12mm

Screw

2.6x10mm
Hex Screw

For Front

For Rear

38251
Gear Case

94004

M3X12mm

Screw

94050

2.6x10mm
Hex Screw

* The picture shown is the gear box after
assembly.
* It is normal for the gears to make a noise.
After brake-in, the noise will be reduced.

ASSEMBLY OF 2-SPEED CLUTCH TRIGGER DISC

SET BALL TO REST ON CAM, NOT PUSHING. IF

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

TOO TIGHT, THE BALL WILL PUSH ON CAM
SPREADING SHOE DISC AND WILL NOT FIT
INTO ALUM. CLUTCH BELL #38296

CARE MUST BE TAKEN TO BUILD
THIS ASSEMBLY CORRECTLY,
OTHERWISE 2-SPEED WILL NOT
ADJUST AND MAY NOT WORK AT ALL.
IN FACT, IF 2-SPEED DOES NOT
SHIFT, CHECK OUT THIS ASSEMBLY!.

Step 2

35325

M2x10mm

Hex Screw

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

ASSEMBLY OF THE TWO SPEED CLUTCH SHOES

Step 1

* Slide the Clutch Shoe Carrier
over the 38525 and set the
4x4 screw in the "D" cut.

94034

4x4mm

Set Screw

38315

Steel Ball

38312
2 Speed
Clutch Shoe

38313

Spring

94033

3x3mm

Set Screw

35325

M2x10mm

Hex Screw

38315

Steell Ball

94033

3x3mm

Set Screw

38313

Spring

38312

2 Speed
Clutch Shoe

38525

2 Speed Main Shaft
(Cd3 only)

38316

Clutch Shoe
Carrier

94034

Set Screw
4x4mm

M2x10mm

Hex Screw

38313

Spring

94033

3x3mm
Set Screw

ASSEMBLY OF THE TWO SPEED GEAR

Step 1

38301
Spur Gear

38297

Retaining Ring

Step 2

94001

M3x4mm
screw

37400

2x8.8mm
Pin

*Insert the 38279 into Break
disc mount.

38279

3x13.8mm
Pin

38295
1 st Gear Carrier
(One-Way)

37430

5x11x4mm
Ball Bearing

* Put the brake disk
before assembly

38279
3x13.8mm

Pin

38300
38T
Spur Gear

38297
Retaining Ring

37400

2x8.8mm
Pin

38296
2nd Gear
Clutch Bell
(Ball Bearing)

38519
6x18.5x4mm

Plastic Washer

37430
5x11x4mm

Ball Bearing

* Trim any burrs from the
inside of the edge with
a hobby knife before
assembly.

37400
2x8.8mm
Pin

37430
5x11x4mm

Ball Bearing

38519
Bevel Gear
Cap Joint(R)

94001

M3x4mm
screw

40042

94001
M3x4mm

Screw

38519
Brake Disc
Mount

38279
3x13.8mm
Pin

ASSEMBLY OF THE BRAKE AND DIFF. MOUNT

38519

Bushing Support

M3x30mm

Screw

94000

M3x12mm

Screw

94004

Remove the double-side
tape before assembly.

38271

Brake Pad

Brake
Spring

40040

M2x8mm
Hex Screw

94047

38272

Brake Pad
Linings

94004
M3x12mm

Screw

40040
Blake Pad
Spring

38519
Plastic Bushing

38273
Brake Cam

Brake Disk

94047

M2x8mm
Hex Screw

38520
Brake Mount

(Upper)(Front)

94000

M3x30mm
Screw

38520
Roll Bar

94000

M3x30mm
Screw

38520
Brake Mount

(Upper)(Rear)

1.5mm

* Leave the 1.5mm space
between brake pads.

Please notice!

* Position the brake cam
in the direction as shown.

ASSEMBLY OF THE FRONT KNUCKLE ARMS AND CVD SHAFT

Step 1

37450

10x15x4mm
Ball Bearing

Step 3

39150

10mm Alum.
Set Screw

38406

CVD Shaft

*"L" make are for
left-side.

37430

5x11x4mm
Ball Bearing

37450
10x15x4mm
Ball Bearing

38524
2x9.8mm
Pin

39140
8mm
Steering Ball

38265

Front Knuckle
Arm (Left)

37430
5x11x4mm
Ball Bearing

38523
CVA Dog Bone

39150

10mm Alum.
Set Screw

39140
8mm

Steering Ball

39141
8mm

Steering Ball
Washer

Step 2

39150
10mm Alum.
Set Screw

39141

8mm
Steering Ball
Washer

*Notice the direction
of the hex screw.

Assembly of the right and left-side are the same.

Push 2 ball
bearings into
knuckle arm

39140
8mm

Steering Ball

38265
Front Knuckle
Arm (Right)

37430

5x11x4mm
Ball Bearing

Make steering
ball move
smooth.

as shown.

Make steering
ball move
smooth.

ASSEMBLY OF THE FRONT SUSPENSION ARMS

38399
Front Upper

94035

3x8 mm
Set Screw

3 x 8mm set screw is
used to adjust the
ride height.

38399
Front Lower

Arm

94035
3x8 mm
Set Screw

Arm

37360
4mm

Ball&Socket

FRONT KNUCKLE
ARM ASSEMBLY.

LEFT SIDE

Assembly of the right and left-side are the same.

RIGHT SIDE

FRONT KNUCKLE
ARM ASSEMBLY.

38399
Front Upper Arm

37360
4mm
Ball&Socket

94035

3x8 mm
Set Screw

A 3 x 8mm set screw
is used to adjust the
ride height.

38399
Front Lower Arm

ASSEMBLY OF THE REAR WHEEL HUB

39150
10mm Alum.
Set Screw

39141
8mm
Steering Ball
Washer

39150

39150

10mm Alum.
Set Screw

37430

5x11x4mm
Ball Bearing

37450

10x15x4mm
Ball Bearing

39140

8mm
Steering Ball

10mm Alum.
Set Screw

39141
8mm
Steering Ball
Washer

Notice the direction
of the steering ball
washer.

37430
5x11x4mm
Ball Bearing

38266
Rear Wheel
Hub

Assembly of the right and left-side are the same.

37450

10x15x4mm
Ball Bearing

38267
Rear Wheel

Axle Shaft

Push

Push 2 ball bearings into
rear wheel hub as shown.

Push

ASSEMBLY OF THE REAR SUSPENSION ARMS

38399
Upper Arm

Plastic Rod End

(Left- Hand Side)

37360

Ball & Socket

94035

3x8 mm
Set Screw

94005

M3x16 mm
Screw

37370

6 mm
Ball & Socket

37370

6 mm
Ball & Socket

37360

Ball & Socket

38399

3x20mm
Turnbuckle

38399
Rear Lower Arm

A 3 x 8mm set screw is used
to adjust the ride height.

38399

Rear Lower Arm

3x8 mm
Set Screw

94005

M3x16 mm
Screw

94035

(Right- Hand Side)

Assembly of the right and left-side are the same.

38399

Rear Upper Arm

A 3 x 8mm set screw is used
to adjust the ride height.

94035
3x8 mm
Set Screw

37360

Ball & Socket

38398
3x20mm

Turnbuckle

Rear Upper Arm

38399
Rear Upper Arm

37370
6 mm

Ball & Socket

9 mm

94005

M3x16 mm
Screw

38399
Upper Arm
Plastic Rod End

ASSEMBLY OF THE SEVRO SAVER

94041

M3
Nylon Nut

37360

4mm

Ball & Socket

94003

M3x10mm
Screw

94004

M3x12mm
Screw

38288

Servo Saver
Spring

36742

Servo Saver
Bushing

38276

3x6 mm
Brass Bushing

38277

5x8 mm
Brass Bushing

Option:
38644 Ballbearing Set
(For servo Saver )

3x6x2.5m
Ballbearing x2

35958
5x8x2.5mm
Ballbearing x2

37360
4mm
Ball & Socket

38288
Servo Saver
Spring

94004
M3x12mm
Screw

38644
3x6x2.5mm

Brass Bushing

38289
Servo Saver

35958
5x8x2.5 mm

Brass Bushing

94004

M3x12mm
Screw

38289
Servo Saver

35958
5x8x2.5 mm

Brass
Bushing

94041

M3
Nylon Nut

38289
Servo Saver

94004
M3x12mm
Screw

37360
4mm
Ball & Socket

37360
4mm
Ball & Socket

36742
Servo Saver

Bushing

38644
3x6x2.5mm
Brass Bushing

38289
Servo Saver

*Use the long ball end for both steering rod and steering servo rod.

Steering Rod

A

Steering Servo Rod

B

A

Put steering rod into
4mm ball & socket.

37650
4mm
Ball End (Long)

38281
3x40mm
Turnbuckle

Approx 57 mm

37650
4mm
Ball End (Long)

Approx 54 mm

Snap steering rod into
4mm ball & socket.

Put steering rod into
4mm ball & socket.

37650
4mm
Ball End (Long)

Made two steering rod for left and
right hand side.

38281
3x36mm

Turnbuckle

37650
4mm
Ball End
(Long)

B

A

ASSEMBLY OF THE SEVRO SAVER
AND STEERING RODS

94041

M3
Nylon Nut

94041

M3
Nylon Nut

94018

M3x5mm
Flat Head
Hex Screw

38275

Servo saver
Screw

94019

M3x10mm
Flat Head
HexScrew

38275
Servo saver

Screw

38528
Cd3 Stock
Chassis

94018
M3x5mm
Flat Head
Hex Screw

94041
M3
Nylon Nut

t

c

S rew

emen

C

94019

M3x10mm
Flat Head
HexScrew

Front Gear
Box Assembly.

38263

Arm Holder for 0
(Lower/Rear)

94019

M3x10mm
Flat Head
HexScrew

ASSEMBLY OF THE FRONT ARM HOLDER
ONTO CHASSIS

38263
Lower Arm Holder for 0 and 1.5 and

2.5 degree.

Assembly of the right and left-side are the same.

Use the 0 degree for
front arm holder.

For assembly stabilizer:

* Use a 3mm drill to
hone out the front
lower arm holder.

M3x3mm

M3x10mm
Flat Head
Hex Screw

4mm
Ball & Socket

3x55mm
Lower Arm Shaft

94033

94019

37360

38419

38263
Arm Holder

(Front/Lower)

ASSEMBLY OF THE FRONT STABILIZER

94019

M3x10mm
Flat Head
HexScrew

M3x3mm

Insert the drive shaft
before assembly.

38419
3X55mm
Lower Arm Shaft

37360
4mm
Ball & Socket

*Put steering rod into

..

4mm ball & socket

M3x16mm
Screw

2.5mm
E-Ring

M3x3mm
Set Screw

94005

Assembly of front stabilizer

94005

90020

94033

2.5mm
E-Ring

M3x16mm
Screw

90020

38418
Stabilizer

Mount

M3x3mm
Set Screw

94033

38420

Stabilizer

2.5mm
E-Ring

90020

94033
M3x3mm

Set Screw

M3x16mm
Screw

94005

Stabilizer
Mount

38418

Stabilizer
Balance
Adjuster

*Keep stabilizer ball in the center.

*Turn stabilizer balance adjuster to
adjust the stabilizer to the same angle.

Center

ASSEMBLY OF THE REAR STABILZER

38418

94005

M3X16mm
Screw

Stabilizer
Mount

94005

M3x16mm
Screw

90020

2.5mm
E-Ring

38420
stabilizer

94033
M3x3mm
Set screw

*Keep stabilizer ball in the center.

*Turn stabilizer balance adjuster to
adjust the stabilizer to the same angle.

38418
Stabilizer
Balance
Adjuster

90020

2.5mm
E-Ring

38418
Stabilizer
Mount

Center

94005
M3x16mm
Screw

94033
M3x3mm
Set screw

Assembly of rear stabilizer

2.5mm
E-Ring

94003

M3X3mm
Set Screw

ASSEMBLY OF THE FRONT STIFFENER
ONTO CHASSIS

94019

M3x10mm
Flat Head
Hex Screw

94032
M3x8mm
Screw

38518
Front Stiffener (Left)

94032
M3x8mm
Screw

94032

M3x8mm
Screw

38518

Front Stiffener (Right)

ASSEMBLY OF THE REAR STIFFENER
ONTO CHASSIS

94019
M3x10mm
Flat Head
Hex Screw

94002

M3x8mm
Screw

38518
Rear Stiffener (Right)

94002

M3x8mm
Screw

94002
M3x8mm
Screw

38518
Rear Stiffener (Left)

94019
M3x10mm
Flat Head
HexScrew

94019

M3x10mm
Flat Head
HexScrew

94019
M3x10mm
Flat Head
HexScrew

94019
M3x10mm
Flat Head
HexScrew