O.S. Engines 70SZ-H - Manual (Page 4)

6
Notes on installing cooling fan and clutch
Do not use a tool which
locks piston when
installing a cooling-fan
and clutch, or top of
the piston may be
damaged. Also, do not
insert a screw driver or
the similar into the
exhaust port.
It is recommended to use Crankshaft
Clamp 7091 (Code No.71530500) available
as an optional tool.
It is made of durable engineering plastic
and locks the crankshaft without risk of
damage to any part of the engine.
Application is as follows:
Remove the crankcase rear cover plate from the
engine and rotate the crankshaft to the bottom
dead center (BDC) position.
Insert the crankshaft clamp so that its grooved
portion surrounds the crankpin and lower end of
the connecting rod and securely tighten the fan
or clutch onto the crankshaft.
Insert this groove onto
the connecting rod.
BDC position
Rotate the crankshaft so that the
connecting rod comes to this position.
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This is a high performance engine designed
for 3D flight as well as F3C competition.
It may be replaced with the current 60 size
helicopter engine without changing the gear
ratio as the mounting bolt pattern is the
same. Also, the six mounting bolt pattern
increases fore and aft rigidity. New design
60K carburetor has three adjustable controls
which enables independent adjustment at
idling, hovering and high speed.
INTRODUCTION
Standard accessories
Because of initial tightness, a standard
electric starter may have difficulty in
rotating the engine when cold, before it
has been adequately run-in. In this case,
use a high-torque type starter.
DO NOT, however, confuse tightness
with the symptoms of hydraulic lock
caused by an excess of fuel within the
cylinder - often the result of over-
priming.
Attempting to force the engine to turn
over in this condition may cause
internal damage. Instead, remove the
glowplug, invert the engine and eject
surplus fuel from the combustion-
chamber.
Note:
As delivered, the carburetor is not fit to
the engine.
Note:
Carburetor Type 60K-C
Carburetor Rubber Gasket
Carburetor Sealing Washer
Carburetor Retainer Assembly
Glow Plug No.8
Woodruff Key
Needle Adjusting Screw (2.6x5 2pcs.)
Instruction manual