GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved. No liability for printing errors 04/2011
10
Installing the engine
This section describes the installation of the OS MAX 120 AX, but the general
procedure is the same for any other power plant.
The engine should be screwed to the arms of the two-part engine mount in such a
way that the distance between firewall and the front of the propeller driver is around
140 mm.
Screw the engine mount to the firewall, positioned so that the engine is located
centrally on the firewall: mark the position of the screw-holes on the firewall, then drill
the holes to suit the captive nuts. Fix the engine mount to the firewall using the four
cheesehead screws and captive nuts supplied in the kit. Apply UHU thread-lock fluid
to the screws to prevent them working loose.
The throttle arm on the carburettor must be removed in order to fit the throttle
pushrod. Drill a 3.5 mm Ø hole in the firewall in the appropriate location for the
throttle pushrod. Slip the throttle pushrod and guide tube through the firewall and into
the fuselage; the plain end must pass through the hole in the former and then
through the cross-hole in the swivel pushrod connector mounted on the throttle servo.
Fix the throttle arm on the carburettor throttle barrel in such a way that it is parallel to
the axis of the carburettor when the throttle barrel is exactly half-open.
