O.S. Engines 108FSR - Manual (Page 10)

Make sure that the mounting beams are parallel and
that their top surfaces are in the same plane.
Hardwood mounting beams
O.S. radial motor mount
(cast aluminum)
How to fasten the mounting screws.
Tighten second nut firmly
down onto first nut.
Tighten this nut first.
Steel washer
5mm
steel screw
Spring
washer or
lock washer
Hardwood such as
cherry or maple.
Spring
washer
5mm steel
Allen screw
5mm steel nuts
Use mounting screws of a diameter (between 5mm)
appropriate to engine size (see table left).
Front view Side view
Top surfaces
are not in the
same plane.
Opposite
beam
Top surfaces
are not in the
same plane.
Re-align the surfaces
as necessary
Engine does not
rest firmly.
CORRECT
INCORRECT
Top surfaces are in the same plane.
9