Imperial Home Page -> Repair -> Accessories -> Gas Heater -> Page 9
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ture control in high
position). The fuel valve will open and spray from nozzle can then be
examined.
CAUTION
Have a fire
extinguisher at hand and avoid any possibility of igniting the spray.
NEVER attempt to burn this assembly in the open.
1. The spray pattern
must consist of a fine mist of fuel which is symmetrical in shape and
is centered in mixer assembly. There must be no dripping or leakage
around nozzle seat. If spray is coarse or uneven, or is directed at an
angle in the mixer, the nozzle is defective and must be replaced.
m. Additional causes
of burner failure are excessive clogging of screen in fuel inlet,
clogging of fuel passages within burner casting, or a defective valve
plunger or seat. Check these parts and replace as required.
38. HEATER GETS TOO HOT
This trouble can be
caused by a poorly adjusted thermostat or insufficient fresh air. To
test thermostat, connect a test light between white terminal of
ignition unit and ground. Start heater with engine running. After
heater warms up, the test light should go on and off as thermostat
cycles the heater on and off. If the heater cycles, but test light
remains on, it is an indication that thermostat contacts are remaining
closed and heater is cycling on overheat switch. Install a new
thermostat to correct this condition. The fresh air supply should be
checked before replacing thermostat since proper thermostat action is
dependent upon an adequate supply of fresh air through heater system.
Insufficient air flow can be caused by defective fresh air blower
motor or by an obstruction in fresh air system. Distributive ducts
door must be open at any time heater is in use. Door is controlled by
temperature lever on instrument panel.
39. HEATER WORKS INTERMITTENTLY
a. If heater gets very
hot and shuts itself on and off in an intermittent way, the trouble is
probably caused by insufficient fresh air flow. This will cause heater
to shut off on the overheat switch. Check fresh air blower and short
coupling duct between blower and heater, also distribution duct door
where air enters duct on right side of passenger compartment.
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b. Another cause of
intermittent operation is air lock in heater fuel pump caused by small
air bubbles in fuel. To correct this condition, inspect the heater
fuel take-off tee in engine fuel pump. If heater fuel line comes off
at top, remove fittings from fuel pump and reinstall them so that the
heater fuel line is attached at the bottom. This will prevent bubbles
from entering fuel pump. Tighten all fittings carefully and bleed fuel
line after it is attached to heater fuel pump.
40. HEATER CAUSES ODOR
a. If odor is raw
gasoline, the fuel connection at burner casting is leaking or solenoid
valve is not tight on casting. Check and tighten leak. A slight odor
when a new heater is first turned on should be disregarded.
b. If odor is burned
gasoline, the exhaust tube under heater is leaking and must be
repaired.
41. TOO MUCH SMOKE FROM HEATER
Excessive smoking and
carbon are caused by a slow combustion air motor or a defective
nozzle. Check these causes and repair or replace as required. This
condition could also be caused by delayed ignition, resulting from
spark plug electrodes which are badly burned, out of adjustment, or
shorted with carbon. Check plug gap. It should be .085 inches and the
electrode should be reasonably clean and approximately centered in
insulator of spark plug. Bend the ground electrode when making
adjustment.
42. HEATER MAKES NOISE WHEN STARTING
a. If heater
"pops" or "spits" when starting or cycling, it is
an indication that fuel is being admitted to burner that is not being
instantly ignited. This can be caused by a leaking solenoid valve seat
or plunger which will permit fuel to flow in the "off"
position. Another possible cause is low fuel pressure from a defective
pump, or a combination of low fuel pressure and insufficient
combustion air caused by a slow burner blower motor.
h. Check fuel pressure
first; if pressure is satisfactory, remove entire burner assembly from
heater. Disconnect ignition cable and solenoid leads, but reconnect
the fuel line. Examine inside of mixer can to make sure the
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This page last updated April 26, 2001. Send us your feedback, and come join the Imperial Mailing List - Online Car Club
