Model 800: 1956 Imperials and earlier
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from the grommet in the
cover unless one or other requires replacement.
Loosen clamp which
attaches the burner assembly to heat exchanger and break the seal
formed by the gasket. The burner assembly can then be removed with
rubber vent tube attached.
c. Inspection and Disassembly of Burner
The nozzle and mixer
assembly should receive special inspection before disassembly since
the condition of these parts will give an indication of the cause of
unsatisfactory operation. The nozzle and inside of mixer can, around
the nozzle, will normally be covered with a medium layer of black
carbon and the nozzle should have a small gray opening at the orifice.
The outer end of mixer will usually be burned to a gray or reddish
color and some scaling or loose particles are usually present. These
will do no harm.
Indications of
improper operation are an uneven build-up of black carbon, or an
excessively burned or eroded spot on the mixer. The openings around
nozzle must not be clogged with carbon since this will prevent entry
of proper amount of combustion air. If these symptoms are present, the
condition will not be remedied by cleaning, since it is caused by a
one-sided spray from nozzle or by dripping or leakage around the
nozzle seat.
The spark plug
electrodes will operate properly with a considerable accumulation of
carbon and lead but must not be shorted out. If the electrodes are
burned, this indicates an improperly directed spray and nozzle or
nozzle seat is at fault.
d. Disassembly of Burner
Remove the fuel fitting
and screen from fuel inlet. Remove spark plug retaining cap and lift
out spark plug. Remove mixer and louver plate assembly by removing
three screws in louver plate. Remove nozzle with a 5/8 inch box wrench
or socket and remove rubber spacer which is underneath nozzle. Remove
solenoid cover, coil, cork gasket; remove three screws in bottom of
cup and remove cup, sealing disc, and gasket from burner casting.
Invert the casting, and valve spring and plunger will drop out. Remove
valve seat retainer from nozzle side of casting, using an Alien wrench
(1/4 in. across flats) and remove valve seat and valve seat gasket.
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e. Inspection of Burner
Inspect the valve seat
for scoring around the sealing surface and inspect the end of plunger.
The, plunger contains a rubber insert which must be flat and slightly
recessed into the metal retainer. If the insert is uneven, replace the
plunger assembly. Do not attempt to clean or repair the nozzle.
Replace this unit at each overhaul. Clean burner casting, mixer
assembly and spark plug, being very careful not to permit any foreign
matter to enter the passages of the burner casting. Discard any
defective parts and replace with new.
f. Assembly of Burner
If fuel line inlet
screen was removed from burner casting, install a new screen. Install
the fuel inlet fitting and tighten. Install the valve seat gasket, the
valve seat and the valve seat retainer in the order named, making sure
the pointed side of the valve seat is toward the solenoid end of the
casting. Tighten the retainer firmly but do not use force. Install a
new spacer and nozzle and tighten. Insert the valve plunger in the
other end of casting and check it for free movement, then place
spring, gasket, sealing disc and solenoid cup on the casting and
reinstall three screws, which must be tightened evenly to insure a
good seal.
Insert coil retainer
gasket in bottom of coil retainer. Insert coil assembly so that the
terminal fits down into the cut-out portion of retainer, and ground
terminal is directly over screw hole at the top. Install cover on
retainer and tighten screw securely. Position the gasket over the
louver plate.
NOTE: The step on
the inside portion of the gasket must contact the outer flange of
louver and tapered portion of gasket must face the mixer. Position
louver plate and mixer assembly with gasket over nozzle. Align three
screw holes and spark plug hole with their respective holes in the
burner casting. Install three lock-washer screws in louver plate and
tighten finger tight. Tighten screws to apply even pressure to the
nozzle.
Adjust the spark plug
gap to .085 inch. Install spark plug gaskets on spark plug, (concave
side of gaskets against the ball portion). Carefully insert the spark
plug through the opening in housing and through louver plate. Make
certain that the guide slot of spark plug
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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
