O.S. Engines 46LA-S - Manual (Page 22)

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Symptom Factor Cause Corrective action
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 6 Priming.
Sluggish rotation
Glowplug battery
discharged.
Glowplug element is
burned out
Something wrong with
battery leads.
Engine "flooded" due to
excessive priming.
Insufficient priming.
Engine fails
to fire.
. . . . . .
. . . . . .
. . . . .
. . . .
. . . .
. . . . .
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START
Four key points
For quick, reliable starting, the following four conditions are required.
1 Good compression. 2 Adequate "glow" at glowplug. 3 Correct mixture.
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.
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