O.S. engine FL-70 Setup guide

FL-70
FOUR CYCLEENGINE
OWNER'SINSTRUCTIONMANUAL
Itisof vitalimportance, beforeattempting to
operateyourengine, toreadthe general
•SAFETYINSTRUCTIONS AND WARNINGS'
section on pages 2-6 of this booklet and to strictly
adhere to the advice contained therein.
•Also, pleasestudy the entire contents of this
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.
•Keepthese instructions ina safe placeso that
you may readily refer to them whenever
necessary.
•Itissuggested thatanyinstructionssupplied
with the aircraft, radiocontrol equipment, etc.,
are accessible for checking atthe sametime.

CONTENTS
SAFETY INSTRUCTIONS AND WARNINGS
ABOUT YOUR O.S. ENGINE ---------------- 2-6
ENGINECONSTRUCTION ------------------------7
NOTESWHEN APPLYING AN ELECTTRICSTARTER ---- 8
INTRODUCTION -------------------------- 9
BEFORESTARTING ---------------------- 10-13
ENGINE PARTS NAME--------------------------------------14
INSTALLATION ------------------------------------------------ 15-16
SILENCER& EXHAUSTHEADERPIPEINSTALLATION------- 17
FUEL TANK & LINES -------------------------------- 18-20
THROTTLELINKAGE,NEEDLE-VALVE EXTENSION ------ 21
PROPELLER& SPINNERATTACHMENT---- 22-23
GLOWPLUG -------------------------------------------24
TYPE 60WCARBURETOR, STARTING --------25-27
RUNNING-IN, CARBURETOR -------------------- 27-30
CARBURETOR AIR-BLEED ADJUSTMENT-------- 31
TROUBLE SHOOTING WHEN THE
ENGINE FAILS TOSTART----------------------- 32-33
VALVE ADJUSTING -------------------------------- 34
HOWTOSETTHE CAMSHAFT TIMING --------- 35
CARE AND MAINTENANCE ----------------------- 36-37
ENGINEEXPLODEDVIEWS&PARTSLIST--------38-39
CARBURETOR EXPLODED VIEWS
&PARTS LIST ---------------------------------------- 40-41
GENUINEPARTS & ACCESSORIES -------42-43
THREE VIEW DRAWING --------------------------------- 44
1

SAFETY INSTRUCTIONS AND WARNINGS ABOUTYOUR O.S.ENGINE
Remember that your engineisnota "toy",buta highly efficient internal-
combustion machinewhosepoweriscapableof harmingyou,orothers,ifitis
misused.
As owner, you, alone, are responsible for the safe operation of your engine, so act
with discretion and care at alltimes.
Ifat some future date, your O.S.engine is acquired byanother person, we would
respectfully request that these instructions are also passed onto its new owner.
The advice which follows isgrouped undertwo headings according to the
degree of damage ordanger which mightarise through misuse orneglect.
WARNINGS
These cover events which
might involveserious(in
extremecircumstances,even
fatal)injury.
NOTES
These cover the many other
possibilities, generally lessobvious
sources of danger, butwhich, under
certain circumstances, may also
causedamage orinjury.
2

WARNINGS
Model engine fuelisalso highly
flammable.Keepitawayfromopenflame,
excessive heat, sources of sparks, or
anything else which might
igniteit.Donotsmoke or allow
anyoneelsetosmoke,neartoit.
Aweakened orloose propellermay
disintegrate orbethrown off and,since
propeller tip speeds with powerful
enginesmayexceed600feet(180metres)
persecond, itwill beunderstood that
such a failure could result inserious
injury, (see'NOTES' section relatingto
propellersafety).
Nevertouch, or allow any object to come
intocontact with, the rotating
propeller anddo notcrouch
over the enginewhen itis
running.
Neveroperate your engineinanen-
closed space. Modelengines,likeauto-
mobileengines,exhaust deadlycarbon-
monoxide. Run your engineonlyinan
openarea.
Modelengines generate considerable
heat.Donottouch anypart of your
engineuntilithas cooled. Contactwith
the muffler (silencer),
cylinder head orexhaust
header pipe, inparticular,
may resultina serious burn.
Modelenginefuel ispoisonous. Donot
allow itto come intocontactwiththeeyes
ormouth.Alwaysstoreitina
clearlymarkedcontainerand
out of the reach ofchildren.
3

NOTES
This engine was designed for model
aircraft. Donotattempt to useitforany
otherpurpose.
Mount the engine inyour model securely,
following the manufacturers' recommenda-
tions,usingappropriate screws andlock-
nuts.
Besure to use the silencer (muffler)
suppliedwiththe engine. Frequent
exposureto an openexhaust may
eventually impairyour hearing.
Such noise isalso likelyto cause
annoyance to others over a wide area.
Ifyou remove the glowplug from the engine
andcheck its condition by connecting the
battery leads to it, do not hold the plug with
bare fingers.Use anappropriate tool or a
folded piece of cloth.
Installa top-quality propeller of the
diameter and pitch specified for the engine
and aircraft. Locate the propeller onthe
shaft so that the curved face of the blades
faces forward-i.e. inthe direction of flight.
Firmly tighten the propellernut,usingthe
correct size wrench.
4

NOTES
Always check the tightness of the propeller
nutand retighten it,if necessary, before
restarting the engine, particularly inthe
case of four-stroke-cycleengines. Ifa
safetylocknut assembly isprovided with
your engine, always use it. This will prevent
the propeller fromflying off inthe event ofa
"backfire",even if itloosens. Also, check
the tightness of allthe screwsandnuts
before restarting the engine.
Ifyou install a spinner, make sure that itis
aprecisionmade productand that the
slots forthe propellerblades donotcut into
the blade roots and weaken them.
Preferably,use an electric starter.The
wearing of safety glassesisalso strongly
recommended.
Discard any propellerwhich has become
split, cracked, nicked or otherwise rendered
unsafe. Neverattempt to repair such a
propeller:destroy it.Donotmodifya propeller
inanyway, unlessyouare highlyexperienced
intuningpropellersforspecialized
competitionwork such aspylon-racing.
Take care that the glow plug clip or battery
leads do not come into contactwith the
propeller.Alsocheck the linkage to the
throttle arm. A disconnected linkage could
alsofoul thepropeller.
Afterstarting the engine, carry outany
needle-valve readjustments froma safe
position behind the rotating propeller. Stop
the engine before attempting to make other
adjustments to the carburetor.
5

NOTES
Adjust the throttle linkage so that the engine
stops when the throttle stick and trim lever
on the transmitterare fullyretarded.
Alternatively,the engine maybestopped by
cutting off the fuel supply. Never try to stop
the enginephysically.
Take care that loose clothing(ties,shirt
sleeves, scarves,etc.)do not come into
contact with the propeller.Donotcarry loose
objects (such aspencils, screwdrivers, etc.)
ina shirtpocket from where they could fall
throughthepropellerarc.
Do not start your engine inanarea
containing loose gravel or sand.
The propeller may throw such material in
your face andeyes and cause injury.
For theirsafety,keep all onlookers
(especially small children) wellback (at
least 20 feetor 6 meters) when preparing
your modelforflight. Ifyou have to carry
the model to the take-offpoint with the
engine running, be especially cautious.
Keep the propeller pointed away from you
andwalk well clear of spectators.
Warning! Immediately aftera glowplug-
ignitionengine has been run and isstill
warm, conditions sometimes existwhereby
itisjust possible forthe engine to abruptly
restart ifthe propeller iscasually flipped
over compression WITHOUT the glowplug
battery being reconnected. Remember this
ifyou wish to avoid the risk of a painfully
rapped knuckle!
6

ENGINE CONSTRUCTION
With this engine,the piston will
feel tightatthe top of itsstroke
(TDC) when the engine iscold.
This isnormal.
The cylinder bore Isa little
tapered.
Thepistonand cylinder are
designed to achieve a perfect
running clearance when they
reach theirrunningtemperatures.
When theengineiscold.Whentheengineishot
Crankshaft
Alittletapered
Piston
CylinderLiner

NOTESWHENAPPLYING
ANELECTRICSTARTER
Donot over-prime. This could
cause hydraulic lock and damage
the engine on application of the
electric starter.
Ifover-primed, remove glowplug,
close needle-valve and apply
starter to pumpoutsurplus fuel.
Cover the head with waste to
prevent pumped out fuel coming
intoyoureyes.
8

INTRODUCTION
The FL-70isanair-cooled, overhead-
valve four stroke enginefor modelaircraft
use.This engine issuitable fortrainer,
sportandscale models.
This engine reduces maintenance by
incorporating the firstO.S. ringless
piston/liner assembly.Also, a sealed front
bearing prevents oil leaks. The engine is
fitted with the new easy-to useO.S.60W
airbleed carburetor. This engine is
designed so that more R/0 pilots,from
hobby beginners toskilled Sunday fliers
mayenjoy the performance advantages
of fourstroke engines - greater fuel
economy, higher torque, lower noise and
realisticsund.
STANDARD ACCESSOIES
GlowPlugType F
(fittedwith theengine)
F-4030SilencerAssembly
TNipple
9