O.S.Engines max-30 VG Instruction Manual
It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-5 of this booklet and to strictly
adhere to the advice contained therein.
●
Also, please study the entire contents of this
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.
●
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
●
It is suggested that any instructions supplied
with the vehicle, radio control equipment, etc.,
are accessible for checking at the same time.
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
ENGINE CONSTRUCTION, NOTES WHEN
APPLYING AN ELECTRIC STARTER
INSTRUCTIONS,
TOOLS, ACCESSORIES, etc.
BASIC ENGINE PARTS, INSTALLATION
OF THE STANDARD ACCESSORIES
GLOWPLUG, INSTALLATION,
NOTES CONCERNING THE RECOIL STARTER
CARBURETOR CONTROLS (21E)
STARTING THE ENGINE &
RUNNING-IN ('Breaking-in)
FINAL ADJUSTMENT
CONTENTS
2-5
6-7
8-10
11-15
16-18
19
20-24
25-28
CARE AND MAINTENANCE,
CHECKING THE ENGINE
TROUBLE SHOOTING
EXPLODED ENGINES VIEWS &
PARTS LIST
CARBURETOR EXPLODED VIEW &
PARTS LIST
O.S. GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
1
29-31
32-35
36-41
42-43
44
45-47
48
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
Remember that your engine is not a "toy", but a highly efficient internalcombustion machine whose power is capable of harming you, or others, if it is
misused.
As owner, you, alone, are responsible for the safe operation of your engine, so act
with discretion and care at all times.
If at some future date, your O.S. engine is acquired by another person, we would
respectfully request that these instructions are also passed on to its new owner.
The advice which follows applies basically to ALL MODEL ENGINES and is
grouped under two headings according to the degree of damage or danger
which might arise through misuse or neglect.
WARNINGS
!
These cover events which
might involve serious (in
extreme circumstances, even
fatal) injury.
!
•
Model engine fuel is poisonous. Do not allow it to
come into contact with the
eyes or mouth. Always store
it in a clearly marked container and out of the reach
of children.
Model engine fuel is also
•
highly flammable. Keep it
away from an open flame,
excessive heat, sources of
sparks, or anything else
which might ignite it. Do not
smoke or allow anyone else
to smoke, near to it.
These cover the many other
possibilities, generally less obvious
sources of danger, but which, under
certain circumstances, may also
cause damage or injury.
2
WARNINGS
•
Never operate your engine in an enclosed space. Model engines, like
automobile engines, exhaust deadly
carbon-monoxide. Run your engine
only in an open area.
Model engines generate
•
considerable heat. Do not
touch any part of your
engine until it has cooled.
Contact with the muffler
(silencer), cylinder head
or exhaust header pipe, in
particular, may result in a
serious burn.
!
NOTES
3
NOTES
This engine is intended for model cars.
Do not attempt to use it for any other
purpose.
Mount the engine in your model
securely, following the manufacturer’s
recommendations, using appropriate
screws and locknuts.
Install an effective silencer (muffler).
Frequent close exposure to a noisy
exhaust (especially in the case of the
more powerful highspeed engines) may
eventually impair your hearing and such
noise is also likely to cause annoyance
to others over a wide area.
The wearing of safety glasses is also
strongly recommended.
Take care that the glowplug clip or
battery leads do not come into contact
with rotating parts. Also check that the
linkage to the throttle arm is secure.
For their safety, keep all onlookers
(especially small children) well back (at
least 20 feet or 6 meters) when
preparing your model for running.
Before starting the engine, always check
the tightness of all the screws and nuts
especially those of joint and movable
parts such as throttle arm. Missing
retightening the loose screws and nuts
often causes the parts breakage that is
capable of harming you.
4
NOTES
To stop the engine, fully retard the
throttle stick and trim lever on the transmitter, or, in an emergency, cut off the
fuel supply by pinching the fuel delivery
line from the tank.
Do not attempt to disassemble the recoil
starter of the 30VG(P)-X. If you do so,
the very strong spring inside will be
suddenly ejected. This can be very
dangerous.
Do not extend the starter cord more than
40cm (16"). Do not abruptly release the
operating handle. Allow the cord to
rewind smoothly while still holding the
handle.
Pull the operating handle straight out
when starting the engine, so that the cord
does not rub against the vehicle body or
engine. This will help prevent the cord
from being damaged by abrasion or
engine heat.
Warning! Immediately after a glowplugignition engine has been run and is still
warm, conditions sometimes exist
whereby it is just possible for the engine to
abruptly restart if it is rotated over
compression WITHOUT the glowplug
battery being reconnected.
5
ENGINE CONSTRUCTION
With this engine, the piston
will feel tight at the top of its
stroke (TDC) when the engine
is cold. This is normal. The
cylinder bore has a slight
taper. The piston and cylinder
are designed to achieve a
perfect running clearance
when they reach operating
temperature.
Near TDC
Piston
Cylinder Liner
Crankshaft
Slight taper
NOTES WHEN APPL YING
AN ELECTRIC STARTER
Do not over-prime. This could
cause a hydraulic lock and damage
the engine on application of the
electric starter.
If over-primed, remove glowplug,
close needle-valve and apply
starter to pump out surplus fuel.
Cover the head with a rag to
prevent pumped out fuel getting
into your eyes.
When the engine is cold.
6
NOTE
As delivered, the engine has the
carburetor lightly fit into its intake.
Secure it changing its angle and
outer head position according to the
car chassis.
When the engine is hot.
7
MAX-
30VG(P) SERIES INSTRUCTIONS
This manual handles the following three versions.
MAX-30VG(P)
MAX-30VG(P)-X
MAX-30VG(P) SR
(with recoil starter)
(for ROTO STARTER)
ABOUT THE ENGINE
These are rear exhaust and developed for
mainly Monster Trucks. They are the largest
displacement in the O.S. line up for model
cars and offer overwhelming torque and
power. The new 21E carburetor is a single
adjustment type and fitted with a thermo
insulator. It offers stable running.
The engine mount size is the same as the
21 size and easily replaced in most models.
About MAX-30VG(P) SR
This engine is designed to utilize the SAVAGE
ROTO STARTER System #87110 (for S-25
engine).
In case you own a SAVAGE ROTO STARTER
System #87110, remove the back plate unit
#87117 from the System and install it to the
engine.
The back plate unit #87127 from the ROTO
STARTER System #87126 for Nitro Star K
Series cannot be installed to the engine. You
need to purchase a back plate unit #87117
from HPI.
SAVAGE, ROTO STARTER and Nitro Star are the product
name of HPI RACING.
8
Standard accessories
For
MAX-
30VG(P) /
Glow Plug No.8 1piece
Exhaust Seal Ring 1piece
Super Air Cleaner 203
Assembly
For
MAX-
30VG(P) SR
Glow Plug No.8 1piece
One-way Clutch 1piece
Super Air Cleaner 203
Assembly
MAX-
30VG(P)-X
TOOLS, ACCESSORIES, etc.
The following items are necessary for operating the engine.
Items necessary for starting
FUEL
Generally, it is suggested that the user selects a fuel
that is commercially available for model two-stroke
engines and contains 10-30% nitromethane.
9
As a starting point, we recommend a fuel containing
20% nitromethane, changing to a fuel containing
more nitro if necessary. When the brand of fuel is
changed, or the nitro content increased, it is
advisable to repeat the running-in procedure referred
to in the RUNNING-IN paragraphs. Please note that
with high-nitro fuels, although power
may be increased for competition
purposes, glowplug elements do not
last as long and engine life will be
shorter.
REMINDER!
Model engine fuel is poisonous. Do not
allow it to come into contact with the
eyes or mouth. Always store it in a
!
clearly marked container and out of the
reach of children.
Model engine fuel is also highly
flammable. Keep it away from open
flame, excessive heat, sources of sparks,
!
or anything else which might ignite it. Do
not smoke or allow anyone else to
smoke, near to it.
GLOWPLUG IGNITER
Commercialy available handy
glowplug heater in which the
glowplug battery and battery
leads are integrated.
FUEL FILTER
To be installed in the fuel line
between fuel tank and carburetor
to prevent dust from entering the
carburetor.
STARTER BOX
For starting the engine. It is
not necessary for 30VG(P)X and 30VG(P)SR.
FUEL PUMP
For filling the fuel tank, a simple,
polyethylene "squeeze" bottle,
with a suitable spout, is required.
SILICONE FUEL LINE
Heatproof silicone tubing of
approx. 5mm o.d. and 2mm i.d. is
required for the connection
between the fuel tank and engine.
TOOLS
HEX SCREWDRIVER
Necessary for engine installation.
1.5mm, 2mm, 2.5mm, 3mm
SCREWDRIVER
Necessary for carburetor adjustments.
No.1, No.2, etc
LONG SOCKET WRENCH WITH PLUG GRIP
Recommended for easy removal and
replacement of the angled and recessed
glowplug, the O.S.Long Socket Wrench
incorporates a special grip.
10
BASIC ENGINE PARTS
Heatsink Head
Carburetor
Type 21E
Crankshaft Ball Bearing (Front)
Crankshaft
Exhaust
Cover Plate
Crankcase
Mounting Lugs
MAX-
30VG(P)
Heatsink Head
Exhaust
Starting Shaft
11
Mounting Lugs
Rear Adaptor
MAX-
Carburetor
Type 21E
Crankshaft
Crankcase
30VG(P) SR
INSTALLATION OF THE STANDARD ACCESSORIES
Installing the glow plug.
Install the exhaust seal ring supplied.
Glowplug
Exhaust
Seal Ring
When the exhaust seal ring supplied cannot
be fitted to the exhaust manifold you have,
use a seal ring supplied with the car kit or
the exhaust manifold.
About the Head Gasket
These engines are equipped with two head
gaskets of 0.2mm thick. It is suggested to
adjust the total thickness according to
atmospheric temperature, humidity and
glowplug used.
At early stage of running-in, when a glowplug
tends to burn out early or when high
nitromethane content fuel is used, try to run
the engine with both gaskets or removing the
0.1mm gasket.
When low nitromethane content fuel is used,
try to run the engine removing one gasket.
12
MAX-30VG(P) SR
Exhaust seal ring is not supplied with the
engine. Use an exhaust seal ring supplied
with the car kit.
Installation of one-way clutch
Inert the one-way clutch on the starting shaft with
the O.S. and an arrow mark facing outside.
Then, install the back plate unit #87117.
Starting Shaft
One-way Clutch
13
AIR CLEANER TYPE 203
This is a heavy-duty wet type air cleaner
that has been developed specifically for
3.5cc 'off-road' model car engines.
203 Intake Elbow
Element Base
Filter Element
End Plate
Retaining Screw
NOTE:
The element is already impregnated with a
special filter oil. As this oil is very sticky , take
care, when handling it, to pre vent dust or dirt
from adhering to the element. If your fingers
become contaminated, wash them with soap
and water.
"O" Ring
ASSEMBLY
Insert the filter element on the element base.
Install the end plate with retaining screw,
making sure that the element fits correctly
between the end plate and base.
Insert the joint pipe on the element base and
secure it with "O" ring.
Install the end plate, retaining screw, making
sure that the element fits correctly between
the end plate and base.
Element misaligned
14
REPLACMENT OF ELEMENT
NOTE:
During storage, the oil may have become
unevenly dispersed through the element.
This will be indicated if the blue color of the
element material appears patchy. In this
case, place the element in a small plastic bag
and gently rub the element between finger
and thumb to redistribute oil.
It is advisable to replace the filter element after
each hour of running time. Be careful not to
allow dirt and dust to enter the carburetor.
INSTALLATION
Carefully clean the carburetor, removing any
old adhesive or sealant that may have been
previously used on the outside of the air
intake.
"O" Ring
FURTHER PRECAUTIONS
When removing the air cleaner, check the inside
of the element base and carburetor venturi. If
any dirt is detected, this indicates that the filter
element was incorrectly installed or should have
been replaced earlier. In this event, it is vitally
important to wash out the inside of the engine
thoroughly, with alcohol or fuel, before it is used
again, otherwise rapid wear of the
piston/cylinder assenbly, bearings, connectingrod, etc., will occur. Obviously, it will be
necessary to carry out the same procedure with
the air cleaner and to replace the filter element.
NOTE:
Be careful not to splash alcohol or fuel over
the filter element, or the filter oil will be
washed away, and the filter capacity will be
lowered.
15
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