O.S. Engines 91HZ-R 3D - Manual (Page 20)

38
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 silencer.
Over priming Remove glowplug and pump out 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 carburetor settings
Return the needle valve
and mixture control valve to basic position.
Incorrect servo linkage Reconnect linkage after setting servo at neutral.
Reverse rotating direction of electric starter.
Mare sure the engine rotates counter clockwise
seen from crankshaft side.
39
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 silencer.
Engine overheated Wait until engine has cooled.
Disconnecting plug battery too soon.
Do not disconnect plug battery and wait until
the r.p.m. becomes stable.
Air bubbles in fuel
Fit O rings to the tank screws to
prevent bubbles.