Ofna Racing LD3, LD-3 PRO VERSION Instruction Manual

4WD

Shaft Drive

1:10 SCALE NITRO POWERED TOURING CAR

RTR INSTRUCTION MANUAL

SAFETY PRECAUTIONS

!

This radio control models is not a toy!

- First builders should seek advice from people having building experience in order
to assemble the model correctly and to produce it's performance to full extent.

- Assemble this kit only in places out of children's reach!

- Take enough safety precautions prior to operating this model. You are responsible
for this models assembly and safe operation!

- Always keep this instruction manual ready at hand for quick reference, even after
completing the assembly.

OFNA RACING
22692 GRANITE WAY, STE. B
LAGUNA HILLS, CA. 92653
Tel: [phone]

Technical Data:

Length: 378mm Width: 197- 200mm Height: 110mm W/base: 265mm Ground Clearance: 5mm-10mm(Adjustable)

Caster Angle: 8 to14 Degree (Adjustable) Front Toe-In: Adjustable Rear Toe-In: Adjustable
Track (Front): 173mm Track (Rear): 173mm Tires (Front): 65mm x 26mm Tires (Rear): 65 x 26mm-30mm
Clutch Bell : 15T-19T Spur Gears: 42T- 38T Weight: 1720grms (including engine)

*SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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 heli fuels, they will
over heat engine.

• Buy SHORT glow plugs, OFNA/PICCO Plug (#51007) 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 - Bottle, spout top or 10162 - Fuel Bottle

• #10218 - Red “C” or 10218 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.)

Step 1

Step 3

38255
Cap Joint

37450
10x15x4mm
Ball Bearing

94051
M2x6mm

Flat Head
Tapping
Screw

2mm
E-Ring

O-Ring
5x8x1.5mm

38252
Diff.Case

38278

5x8x1.5mm

O

38278

38253

3x17.8mm
Pin

5x8x0.8mm

5x10mm

Washer

Washer

Step 2

5x10mm
Washer

38256
10T Diff.Gear
(small)

Put the grease into the diff. case
before assembly.

38256

10T Diff. Gear

(small)

2mm

E-Ring

37771
13T
Diff. Gear

2mm
E-Ring

37771
13T
Diff. Gear

(Large)

37771
13T Diff. Gear
(Large))

(Large)

5x10mm
Washer

Step 4

37450
10x15x4mm
Bearing

O--RRiinngg

38278
5x8x1.5mm

38255
Cap Joint

38257
Large
Bevel Gear

38257
Large
Bevel Gear

37450
10x15x4mm
Ball Bearing

38287
Diff.Gasket

Note: Peel off backing

38253
3x17.8mm
Pin

38255

Cap Joint

M2x6mm
Flat Head
Tapping Screw

38256
10T Diff.Gear
(small)

ASSEMBLY OF THE FRONT GEAR BOX

(Build a gear box for front.)

NOTE: DIFF GEARS AND PINION WILL
FEEL ROUGH UNTIL YOU RUN CAR. DO
NOT SHIM GEAR CASE FOR
SMOOTHNESS OTHERWISE GEAR WILL
STRIP.

38251

Step 1

Gear case

3x3mm
Set Screw
94033

90020

2.5mm
E-Ring

38254
12x15x0.25mm
Shim

38258

37430

16T
5x11x4mm
Ball Bearing

*Adjust the backlash

Bevel Gear
(small)

*Use 2 pcs in this side.

with the shim*

E-Ring

16T

90020

2.5mm

38259

16T

5x8x0.8mm
Washer (important)

38258

Bevel Gear
(small)

Bevel Gear

(small)

Shaft

16T

38259

3x3mm
Set Screw

Bevel Gear

(small)

Shaft

* Put the gear in the
right position.

37430
5x11x4mm
Ball Bearing

37430
5x11x4mm
Ball Bearing

M2x6mm
Flat Head
Tapping Screw

38260
Bevel Gear

16T

Cap Joint

*Check the right space
between two ball bearings.

ASSEMBLY OF THE FRONT GEAR BOX

(Build a gear box for front.)

Step 2

* The gear box after assembly.

38251
Gear Case

38251

Gear Case

M2.6X10mm
Screw
94050

M3X12mm
Screw
94004

M2.6X10mm
Screw
94050

M2.6X10mm
Screw
94050

38321

M3X12mm

Screw
94004

ASSEMBLY OF 2-SPEED CLUTCH TRIGGER DISC

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

SCREW AS SHOWN,
LEVEL WITH HOLE EDGE

SET BALL TO REST ON CAM, NOT PUSHING. IF
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

M2x10mm

Screw

3x3mm

38313

Spring

Set Screw

38312

Clutch Shoe

M2x10mm
Screw

ASSEMBLY OF THE TWO SPEED GEAR

Step 1

4x4mm

Set Screw

38323

2 Speed Main Shaft

94034
4x4mm

Set Screw

Note: Must use Locktite

38316

Clutch Shoe
Carrier

38312

Clutch Shoe

38315

Metal Ball

94033
3x3mm

Set Screw

38315

Metal Ball

38313

Spring

94033
3x3mm

Set Screw

38313

Spring

3x3mm
Set Screw

M2x10mm

Screw

ASSEMBLY OF THE TWO SPEED GEAR

Step 3

38300
38T
Spur Gear

38T

Step 4

M3x4mm
screw

37400
2x8.8mm
Pin

38295
1 st Gear Carrier

38279
3x14.8mm
Pin

38296

2nd Gear
Clutch Bell
(Ball Bearing)

(One-Way)

37430
5x11x4mm
Ball Bearing

38301

42T
Spur Gear

42T

38258
16T
Bevel Gear
(Small)

90020

2.5mm

E-Ring

38297
Retaining Ring

38297

Retaining Ring

38258

16T
Bevel Gear
(Small)

90020

2.5mm
E-Ring

*Insert the 382790 into
Break disc mount.

38279
3x14.8mm
Pin

38289
Brake Disc

Mount

38321
M3x4mm

screw

Note: Must use Locktite

37430

5x8mm
Washer

5x11x4mm
Ball Bearing

40042
Brake Disk

*Put the brake disk on
before assembly

37400
2x8.8mm
Pin

38289
5x8mm
Plastic

37430

5x11x4mm
Ball Bearing

5x8x0.8mm
Washer

37430
5x11x4mm

Ball Bearing

ASSEMBLY OF THE BRAKE AND DIFF.MOUNT

*Take off the double sided tape

before assembly.

1

94004
M3x12mm
Screw

94049
M2.6x8mm
Screw

ASSEMBLY OF THE BRAKE AND 2-SPEED

40044

Spring

M3x12mm
Screw

2

38271
Brake Pad

1

38272

Brake Pad
Linings

2

M2.6x8mm
Screw

38272
Brake Pad
Linings

38271
Brake Pad

40044
Blake Pad
Spring

38289
Bulk Head

cover

38289
Plastic Bushing

38273
Brake Cam

38289
Brake Mount/Upper

Note: Cam will fit in one
direction. Check step.2
on page 9. Note plastic
stop tab on backside.

94005
M3x16mm

Screw

94005
M3x16mm

Screw

38289

Brake Mount/Lower

ASSEMBLY OF THE REAL GEAR BOX
(Build a gear box for real)

*Adjust the backlash

with the shim.

*Use 2 pcs in this side.

Step 1

Step 2

DIFFERENTIAL

38254
12x15x0.25mm
Shim

94050
M2.6x10mm

Screw

ASSEMBLY

* Add Gear Grease before
closing gear case.

94004
M 3x12mm

Screw

38254
12x15x0.25mm
Shim

37430
5x11x4mm
Ball Bearing

38251
Gear box

94050
M2.6x10mm

Screw

38251

Gear box

94004
M 3x12mm

Screw

Screw

Note: Do not over tighten screws

94050
M2.6x10mm

Screw

ASSEMBLY OF THE FRONT KNUCKLE ARMS AND CVA SHAFT

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

*Make steering
ball move smooth.

39150
10mm
Hex Screw

39190

CVA
Constant Velocity
Axle

37450
10x15x4mm
Ball Bearing

37430
5x11x4mm
Ball Bearing

Step 2

*"L" make are for
left-side.

37450
10x15x4mm
Ball Bearing

38265
Front Knuckle Arm
(Left)

37430
5x11x4mm
Ball Bearing

39140
8mm
Steering Ball

39141
8mm
Steering Ball
Washer

ASSEMBLY OF THE FRONT SUSPENSION ARMS

39140
8mm
Steering Ball

39150
10mm
Hex Screw

*Notice the
direction hex screw.

Step 1

*Push 2 ball bearings into
knuckle arm as shown.

38265
Front Knuckle Arm
(Right)

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

94035
3x8 mm
Set Screw

94035
3x8 mm
Set Screw

39060
Front Lower Arm

39053
Front Upper Arm

FRONT KNUCKLE
ARM ASSEMBLY.

FRONT KNUCKLE
ARM ASSEMBLY.

39060

Front Lower Arm

39053
Front Upper Arm