Trouble Shooting When The Engine Fails To Start - O.S. engine FS-30S Owner's Instruction Manual

TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START

Four key points
For quick, reliable starting, the following four conditions are required.
1 Good compression.
4 Sufficient electric starter rotating speed.
If the engine fails to start, or does not keep running after being started, check symptoms against the
following chart and take necessary corrective action.
Note: The most common causes of trouble are marked with three asterisks, the less common problems
with one or two asterisks.
Symptom Factor
1 Sluggish rotation
Engine fails
to fire.
Glowplug battery
discharged.
2
Glowplug element is
burned out
Something wrong with
battery leads.
Engine "flooded" due to
excessive priming.
3
Insufficient priming.
Symptom Factor
Incorrect heating of
2
Engine fires
glowplug.
intermittently but
Over priming.
3
does not run.
1 Sluggish rotation.
2 Glowplug battery
Engine fires once
discharged.
or twice, then
fails to fire.
3
Insufficient priming.
Engine starts but
rpm decreases 3 Mixture too rich.
and engine eventually
stops.
3 Fuel not reaching the
Engine starts,
engine.
rpm increases
and engine cuts
out.
Mixture too rich.
3
Engine stops when
battery leads are
2 Mismatch of glow plug and
disconnected after
fuel.
starting.
2 Adequate "glow" at glowplug.
Cause
. . . . . .
Recharge the electric starter battery.
. . . . . .
Recharge lead-acid cell or replace dry battery. (Note: An unused, or almost
unused, dry battery may sometimes be of insufficient capacity if it is "old
stock".)
. . . . .
Replace glowplug. Check that applied voltage is not too high.
. . . .
Check glowplug heating using other leads.
. . . .
Close needle-valve fully and remove glowplug, then flip propeller to pump
out excess fuel. (Invert engine, if possible, while pumping out excess). Re-
start engine. (Priming is not necessary at this time.)
. . . . .
Repeat priming procedure referring to
25
Cause
. . . . .
Voltage too high or too low. Re-check and readjust referring to "BEFORE
STARTING" paragraph 4.
. . . . . . . .
Continue flipping propeller. If engine does not start after more than 10 flips,
disconnect battery from glowplug and leave for a few minutes, then re-
energize plug and flip prop again. If engine still does not start, remove
glowplug and pump out excess fuel by flipping prop quickly.
. . . . . .
Then re-start. (Priming is not necessary.)
Recharge the electric starter battery.
. . . . . .
Recharge lead-acid cell or replace dry battery.
(Note: An unused, or almost unused, dry battery may sometimes be of
insufficient capacity if it is "old stock".)
. . . . .
Repeat priming procedure referring to
. . . . . . .
Close needle-valve half turn (180˚) and wait for several minutes then re-
start.(Priming is not necessary.)
. . . . .
Make sure that tank is filled with fuel. Check that there is not something
wrong with the fuel line (kinked or split). Check that carburettor is not
clogged with dirt.
. . . . . . .
Close the needle-valve a little.
. . .
Change fuel or glowplug.
26
3 Correct mixture.
Corrective action
7 Priming.
Corrective action
7 Priming.