TM 5-4310-227-15
tion of large quantities of air this unit is air
ignition system fires. Once the igni-
cooled. Insufficient air circulation will cause
tion has fired, open the choke one-
overheating and lower the performance level
quarter. Starting may be difficult. Be
of the unit. Keep the doors and louver open
careful not to flood the engine by
fully.
closing the choke too long before the
b. Cooling System. Blow or brush dirt and
engine starts. Hold the choke open to
dust from the engine and compressor cooling
avoid stalling once the engine starts.
fins. Inspect the engine air shroud for foreign
(3) Allow the engine to run until the en-
matter that may restrict the flow of air. Check
gine and compressor crankcase oils
the belt tension frequently. Loose belts can
have become hot enough to vapor-
cause overheating.
ize any water that may have condensed
c. Lubrication. Lubricate the unit in accord-
while the unit was inoperative.
ance with the current lubrication order.
f. Starting, Models BMW-452-ENG and
BMW-452-ENG-1.
(1) These models are winterized to -65
F. after the addition of subzero en-
a. Protection. Take advantage of natural
gine oil. To start the unit at tempera-
barriers that will afford some protection from
tures from -25 to -65F. the unit
blowing dust or sand. Use a tarpaulin to con-
must be preheated. The metal enclo-
struct a screen or shelter for the unit. Cover
sure is provided with a heater duct
the unit when inoperative.
connection for use with a heater.
b. Lubrication. Operating of the air com-
(2) Remove the heater dust cover and at-
pressor under dusty or sandy conditions will
tach heater hose.
require more frequent lubrication. Carefully
(3) Close the doors.
clean all lubrication points before inspecting or
(4) Open adjustable louvers fully.
lubricating the unit. Lubricate in acocrdance
(5) Start the heater and allow it to run
with the current lubrication order. Be careful
for a period of 30 minutes at 150 to
to keep the lubricants free from dust and grit.
200F. discharge temperature.
Avoid excessive lubrications, as dust and dirt
(6) Shut heater off.
will collect and adhere to lubricated areas.
(7) Choke fully by pulling choke out and
Daily servicing of the engine and compressor
crank once.
a i r cleaner is also required in dusty and
(8) O p e n choke half way and repeat
sandy areas. Refer to paragraph 3-6 for serv-
cranking.
icing of the engine and compressor air cleaners.
(9) When engine starts, open choke by
c. Fuel System. Take adequate precautions
pushing choke knob full in.
to prevent sand or dust from entering the fuel
(10) Operate engine at 1800 revolutions
tank. Service the fuel strainer sediment bowl
p e r minute (rpm) (throttle control
as frequent as necessary to keep it free from
full in) for minimum of 10 minutes.
dirt and grit. Store fuel supplies in tightly
Unlatch door of enclosure and allow
closed containers and locate in a protected area.
it to hang open, but not raised.
(11) Pull throttle control full out and op-
erate for 5 minutes with air tank valve
Humid Conditions
open and hose or attachments dis-
If the unit is outdoors and inoperative, place
c o n n e c t e d before closing air tank
a canvas or other waterproof cover over the
valve and pressurizing system.
unit during storms. Remove the cover during
dry periods. Uncover the unit and allow it to
dry after storms. During humid periods, dry
the unit before operation. Keep the fuel tank
a. Indoor Ventilation. Provide sufficient
full to avoid condensation. Frequently drain ac-
room around the air compressor to allow prop-
cumulated condensation from the air receiver
er air circulation In addition to the consump-