O.S. Engines 21VZ-M - Manual (Page 15)

28
TROUBLE SHOOTING
Symptom
Cause Corrective action
Engine fails to fire.
Fuel tank is empty.
Fuel not reaching the engine. Fill the tank with fuel and repeat
Priming procedure.
Glowplug element is burnt out.
Glowplug battery discharged Replace glowplug.
Recharge or replace the battery.
Clogged fuel filter
Silencer inside is dirty.
Clean or replace fuel filter.
Clean inside the silencer.
Over priming Remove glowplug and pump excess fuel.
Fuel tubing is disconnected. Connect fuel tubing securely.
Fuel tubing is kinked, split or has a hole. Check the tubing carefully and replace if necessary.
Incorrect servo linkage Connect correctly after setting servo at neutral.
Reverse rotating direction of electric starter.
Mare sure it rotates counter clockwise seen
from crankshaft side.
29
Symptom
Cause Corrective action
Engine fires intermittently but does not run.
Insufficient fuel in the tank. Fill the tank with fuel.
Deteriorated glowplug Replace glowplug.
Clogged fuel filter
Silencer inside is dirty.
Clean or replace fuel filter.
Clean inside the silencer.
Engine overheated Wait until engine cools.
Glowplug battery disconnected too soon.
Do not disconnect plug battery and wait until
r.p.m. become stable.
Air bubbles in fuel
Install O rings to the tank screws to
prevent bubbles.