O.S. Engines 25LA - Manual (Page 16)

Warning: When using a spinner assembly, make
sure that the notches in the spinner shell are
large enough to clear the propeller blades and so
do not cut into and weaken the blade roots.
Tighten the spinner nut firmly so that compression is
first felt around this position (i.e. with blades
horizontal) when turning the propeller in the direction
of arrow.
3 Checking for gas leakage
4 Filling the fuel tank
Check gas leakage by
turning the propeller
up to this position after
compression is felt.
Compression is first
felt around this posi-
tion when turning
the propeller slowly.
Dribble a few drops
of fuel around the
glowplug and look
for air bubbles.
If leakage is detected, remove the
glowplug, carefully wipe threads,
re-insert and tighten firmly.
Do not allow fuel to overflow into
silencer when refuelling, otherwise
engine may become flooded and
difficult to start.
Re-connect
fuel line
to engine after
tank is filled.
Fuel pump
Use a fuel can filter
(e.g. O.S. Super Filter).
Do not let dirt or
dust enter fuel can.
Disconnect fuel line from
the fuel inlet, and connect
it to the tubing from the
fuel pump.
Fuel (model
glow-plug
engine fuel)
15