the
procedure
in
c. Installation. R e v e r s e
a. a b o v e .
5-14. Outer Combustion Air Duct
a. Removal
(1) R e m o v e t h e e n g i n e f r o m t h e h e a t e r ( p a r a
(2) Remove the screws and the lockwashers
h o l d i n g the outer combustion air duct (16, fig. 5-2)
to the heater and remove the duct.
b. Inspection and Repair.
(1) Inspect the duct for breaks, dents, and
proper mounting.
( 2 ) Straighten any dents and weld oil breaks,
c. Installation. Reverse the procedure in
a. a b o v e .
Arm Assemblies, Rod, and Return
Spring
a. Removal and Disassembly.
(1) Drain the fuel tank and the engine oil
hose.
( 2 ) Remove the carburetor air cleaner (TM 5-
2805-256-14).
(3) Remove the burner assembly (para 5-11).
(4) Remove the bolts, the nuts, and the
washer from each end of the air duct supporting
channel (17, fig. 5-2) to free the channel.
(5) Disconnect the return spring (3, fig. 5-6)
from the damper lever arm (4) and remove the
spring.
( 6 ) Remove the nuts, the lockwasher, and the
b o l t holding the damper pull rod (3) to the damper
lever arm (4)
( 7 ) Remove the rod by pulling it through from
the outside of the heater.
( 8 ) Remove the inner combustion air duct (1)
from the heater.
(9) Take out the cotter pin holding the lever
arm (4) to the damper (2) and remove the lever
arm.
(10) Pull the hinge pin and the washer from
t h e damper, and remove the damper from the duct.
from the tee.
b. Inspection and Repair.
( 6 ) Remove the nuts and the lockwashers and
Inspect t h e c o m p o n e n t s f o r c r a c k s ,
(1)
s e p a r a t e the burner air chamber (9), with the drain
b r e a k s , and dents and check the spring for tension
tube (13), from the triangle hanger (8).
and broken coils.
b. Inspection and Repair.
(2) Straighten any dents and weld the cracks
( 1 ) Inspect the c h a m b e r f o r s e r v i c e a b i l i t y a n d
and breaks.
be sure the drain tube is unobstructed.
c. Installation. Reverse the procedure in
(2) Blow compressed air through the drain
a. a b o v e .
tube to remove any obstruction.
( 3 ) Straighten - any dents and weld rail cracks
and breaks..
