O.S. Engines 25LA - Manual (Page 9)

INSTALLATION
How to fasten the mounting screws.
Hardwood mounting beams
O.S. radial motor mount
(cast aluminum)
Tighten second nut firmly
down onto first nut.
Tighten this nut first.
Steel washer
3mm steel screw
Spring washer or
lock washer
12mm min.
12mm min. Hardwood such as
cherry or maple.
Spring washer
3mm steel Allen screw
Front view
CORRECT
Side view
Top surfaces are in the
same plane.
Re-align the surfaces
as necessary
INCORRECT
Top surfaces are not
in the same plane.
Opposite beam
Top surfaces
are not in the
same plane.
Engine does
not rest firmly.
Rigid hardwood
(e.g. maple)
Installation in the model
A typical method of beam
mounting is shown below,left. O.S. radial motor mount
(Available as an optional extra part.
See parts list)
Make sure that the mounting beams are parallel
and that their top surfaces are in the same plane.
At least
12mm(1/2")
At least
12mm(1/2")
3mm steel nuts
8