TM 5-4520-208-15
c. Cleaning, Inspection, and Repair.
74. Fittings
(1) Clean parts in approved solvent and
a. General. The gasoline engine fuel filter
dry thoroughly.
is mounted on the engine power unit when it
(2) Inspect fittings for cracks, burs, dam-
is received. In addition, two pipe elbows (5
aged threads, and other damage.
and 7, fig. 24), two pipe nipples (3 and 6)
and a quick-disconnect coupling half (8) are
(3) Replace damaged parts.
installed.
d. Installation.
b. Removal.
(1) Install pipe nipple (3) in gasoline
(1) Remove quick-disconnect coupling half
engine (2).
(8), pipe to tube elbow (7), pipe
(2) Install gasoline engine fuel filter (4)
nipple (6) and pipe elbow (5) from
on pipe nipple (3).
gasoline engine fuel filter (4).
(3) Install pipe below (5), pipe nipple
(2) Remove engine fuel filter from pipe
(6), pipe to tube elbow (7), and
nipple (3).
quick-disconnect coupling half (8) in-
(3) Remove pipe nipple (3) from gaso-
to engine fuel filter.
line engine (2).
Section IX. HEAT GENERATOR AIR SYSTEM
75. General
77. Vaneaxial Fan and Mounting Ring
a. Part of the air forced into the heater by
a. General. The fan supplies all air necessary
the fan passes into the combustor where it is
for heater operation. A cast steel mounting ring
mixed with atomized fuel from the nozzle form-
supports the fan and associated parts. Power
ing a combustible fuel-air mixture. This mix-
for the fan is transmitted by a flexible rubber
ture is ignited and burns to heat the exchanger.
sleeve bushing (2, fig. 25) which mates with
b. The major portion of the air entering the
a drive coupling on the power unit and a
casing travels through longitudinal passages
driven coupling half (30) which is pressed on
within and around the heat exchanger, As the
the fan shaft bearing (16). The fan hub (17) is
air passes through, it is heated. A damper ar-
mounted on the fan and is pressed on the fan
rangement at the discharge end of the the heat
shaft bearing. On Model BT400-40-1 heaters
exchanger permits regulation of the heated air
the hinge support bracket (fig. 27) must be
volume.
removed to gain access to the fan mounting
ring.
76. V-Belt
b. Removal (BT400-40)
a. General. The V-belt, driven by the driven
(1) Refer to paragraph 12 and remove
coupling. turns the fuel pump pulley, and
the power unit.
magneto pulley.
(2) Remove drive V-belt (29, fig. 25) by
b. Removal.
slipping V-belt from pulleys.
(1) Refer to paragraph 12 and remove the
power unit.
(3) Remove three screws and lockwashers
(2) Remove drive V-belt (29, fig. 25) by
slipping V-belt from pulleys.
casing.
c. Cleaning, Inspection, and Repair. Clean
(4) Remove two screws and remove ex-
V-belt with a clean, damp cloth. Check V-belt
haust pipe bracket and spacers. Re-
for wear, fraying, and stretching. Replace a
move mounting ring with attached fan
worn, frayed or stretched V-belt.
and pulley from heater.
d. Installation. Install V-belt over three
(5) Remove three screws (21, fig. 25) and
pulleys. Check V-belt tension and adjust, if
lockwashers (20) and remove vane-
necessary (para 47). Refer to paragraph 12 and
axial fan (28) from fan hub (17).
install power unit.
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