Fuel Filter And/Or Nozzle Is Clogged By Thick Fuel - Val6 KBE5L Maintenance Manual

VAL6 KBE5S & KBE5L Trouble Shooting
No. Possible Cause
37 Fuel filter and/or
nozzle is clogged by
thick fuel
(Fuel is sprayed normally form the nozzle)
38 Nozzle is clogged
39 Fuel is contaminated
with water
Combustion stops during the operation
Misfire in about 25 seconds after ignition
40 Lens of flame monitor
is dirty or dusty
41 Poor lighting is
detected by flame
monitor
Cleaning the whirl
vane and inside of
42 Flame monitor
connector is loose
connection
How to check
Take a flame monitor
out, and check whether
its lens is clear or not
Remove a burner and
check whether the whirl
vane and inside of draft
tube are clear or not
Plug flame monitor
connector (CN11) again,
and then turn on
Result
Because of low
temperature, fuel
viscosity increase and
fuel filter and/or nozzle is
clogged
Because of condensation,
there is the dew
condensation water in the
tank
If it is dirty or dustiness,
flame monitor cannot
detect flame properly
If they are dirty or
dustiness, flame monitor
cannot detect flame light
properly
*usually this will be
happen with above #42
at once
Clean the whirl vane and
whirl vane
inside of draft tube
(especially behind whirl
vane) till they are shining
draft tube
If it works normally,
flame monitor connector
fails on contact
7
Remedy
Warm the fuel or
mix kerosene with
diesel.
(Replace a filter
and/or nozzle if
Replace a nozzle
Clean and flush the
tank with kerosene,
alcohol or acetone
Replace a fuel
thoroughly
Clean the lens of
flame monitor with
soft cloth
Clean the whirl vane
and inside of draft
tube or replace a
vane
*clean the lens of
flame monitor
Plug connector
(CN11) firmly
7