Perform this treatment while trying to slowly turn the engine by pulling on the starter rope. Continue heating
until the engine turns freely.
(6) With the engine free turning, direct the heat for one-half minute on the engine cylinder near the
exhaust outlet, then, immediately pull on the starter rope to start the engine. Repeat until the engine starts. If
the engine does not start in five turns repeat the procedure.
(7) After the engine is started and warmed up, open the choke fully.
(8) If the compressor relief valve(s) pop, direct the heat over the intercooler and after- cooler tubing,
exercising care not to apply excessive heat near the nylon control oil tubing.
c. Protection of the Compressor.
(1) General. Store the air compressor in a sheltered, enclosed or if possible heated area. Remove
snow, ice, mud or any other encumberance from all parts of the unit as soon as possible before and after
operation. Drain fuel from fuel tank and carburetor if the unit is to be idled for a long period.
(2) Lubrication. Damage to the air compressor during cold weather operation most often occurs due
to improper circulation of the thickened oil. Engine lubricants prescribed for use below 10 (-12 ) will provide
satisfactory engine lubrication for the lowest anticipated temperatures. Refer to LO 5-2805-257-12. No load
operation should be carried out at the lower engine speed, until the engine and compressor have warmed up.
(3) Fueling. Fill fuel tank in preparation for use and to minimize moisture condensation immediately
after completion of unit operation.
2-12. Operation Under Sandy or Dusty Conditions
a. Cleaning. Clean the engine and compressor thoroughly after each operation. Clean engine and
compressor air inlet filters as required to maintain efficient operation. Service the engine air cleaner when the
red signal reaches the service level, proceeding as follows:
(1) Loosen and remove all mounting hardware.
(2) Wipe out the inside of the air cleaner cover and body with a clean rag.
(3) Remove the element from the air cleaner body and blow it out with compressed air from the
clean side to the dirty side.
b. Fueling. Exercise care when filling engine fuel tank and compressor oil sump. Make certain that no
sand, dirt or dust enters the fuel tank or oil sump. Clean the engine fuel tank filter and the oil sump strainer as
required to maintain efficient operation and to minimize wear or damage to the unit.
c. Protection of the Compressor. Store the unit in a sheltered or enclosed area.
2-13. Operation in Salt Water Areas
a. Operation. Avoid operating the compressor in exposed areas. Provide shelter from salt spray. Keep
manuals in protected storage.
b. Cleaning. Wash the compressor with fresh water to remove residual salt. Wipe dry with clean lint-
free cloth. Clean compressor and gasoline engine air filters as required to maintain efficient operation. For
c. Fueling. Exercise care when filling engine fuel tank or oil sumps to prevent salt water from
contaminating fuel or lubricant. Clean the engine fuel tank filter and oil sump strainer as required to maintain
d. Protection of the Compressor. Touch up all exposed areas with olive drab paint, MIL-C-704 to
minimize salt corrosion. Store the unit in a sheltered or enclosed area.
2-14. Operation at High Altitude
a. Operation. Check that compressor air inlet filter is clean to ensure adequate inlet air supply.
b. Operation in Extreme Cold. If operation is conducted at extremely cold temperatures, refer to
2-15. Operation in Extreme Heat
a. Operation. Check that the compressor air inlet filter is clean to ensure an adequate air inlet supply.
Inspect intercoolers and aftercooler for, bent fins or obstruction which might impede the flow of cooling air to
the compressor and engine. Check oil sumps for adequate lubricant to prevent overheating. If humidity is
excessive, replace dehydrator cartridge more frequently than under usual conditions.
b. Cleaning. Wipe down compressor and engine after each operation with clean cloth to remove dirt
c. Fueling. Exercise care when filling engine fuel tank to prevent moisture from entering fuel supply
tank. Clean the engine filter at shorter intervals than usual to eliminate condensed moisture from fuel supply.