Trouble Shooting - Maruyama MS038 Manual Del Operador

TROUBLE SHOOTING

When engine fails to start:
Symptoms Diagnoses
There is power at the terminal.
There is fuel,
but spark plug
fails to ignite.
No power at the terminal.
Compression is good.
There is fuel and
spark plug ignite.
Compression is bad.
No fuel in the carburetor
Engine fails to run smooth:
Symptoms Diagnoses
Compression is good and
there is no miss fire.
No power
Compression is bad, and
there is miss fire.
Engine overheated
Inaccurate explosion
Engine doesn't sound right
Slow acceleration
English
Causes
Drawing too much fuel.
Faulty spark plug gap.
Faulty spark plug insulation.
Faulty TCI unit or broken wire.
A break or short in the igniton coil.
Bad fuel-oil mixture.
Faulty packing or tightening.
Spark plugs not tightened properly.
Piston rings are sticking.
No fuel in the tank.
Fuel valve is faulty or fuel tank air
vent is plugged.
Fuel channels in the carburetor are
plugged.
Lines are bent.
Causes
Air cleaner element is plugged up.
Air has entered fuel line joints.
Faulty choke lever.
Carbon build-up on cylinder muffler.
Burnt spark plugs.
Short in cable.
Bad mixture or piston ring wear.
Marks on cylinder, cracks in the
piston head.
Fuel-oil mixture is too lean.
Faulty mixture, improper fuel oil ratio.
Carbon build-up overloaded operation.
Faulty spark plug.
Plugged cylinder fins or coolant
channels.
Carburetor not adjusted properly.
Faulty spark plugs.
Faulty magneto or internal short.
Overheated cylinders.
Overload operation.
Faulty mixture or incorrect ratio.
Internal engine damage.
Carburetor not adjusted properly or
faulty compression.
Poor gasoline / oil quality.
Carbon pile-up to build up.
19
Pump:
Symptoms
Cause
Loose joint of suction hose.
Does not
pick up liquid
Suction hose is clogged.
Worn nozzle hole.
The nozzle clogged
with contaminants.
Poor spray condition
Too many nozzles used.
Low rotational speed.
Worn impeller and pump.
Liquid leakage
Worn mechanical seat.
from under
side between
Pump failure.
engine and pump
Countermeasure
Tighten sufficiently.
Disassemble and dislodge obstruction.
Replace with new parts.
Disassemble and clean.
Reduce number of nozzle, or replace
with nozzles of lower output.
Increase rotational speeds up to normal
Disassemble and clean.
Replace with new parts.
Replace with new parts.
20
English