Service
Inspection
Bimonthly
Biweekly
See that all tools and equipment assigned to the lubrication unit are clean,
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serviceable, and properly stowed or mounted. See that all compartments are
in good condition, close and fasten properly.
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Fire extinguisher. Inspect for full charge, proper working order, and secure
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mounting. The amount of charge in the carbon dioxide type of extinguisher
can be checked only by weighing. Empty and full weights are stamped on the
valve head. Inspect for kinked or damaged hose.
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See that all fire extinguisher deficiencies are corrected or reported to the proper
authority.
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Publications. See that a copy of this technical manual and LO 5-4930-202-12 is
on the unit and in serviceable condition.
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Appearance. Inspect the general appearance of the lubricating unit, giving
special attention to cleanness, legibility of identification markings, and
condition of the paint.
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See that deficiencies noticed are corrected or reported to proper authority.
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Modification. See that all available modification work orders applying to the
lubricating unit have been completed.
ENGINE
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Cylinder head, manifolds and gaskets. Inspect the cylinder heads, manifolds, and
exhaust pipe for leaks, loose bolts and nuts, and defective gaskets.
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Tighten any loose manifold and exhaust pipe mounting bolts and nuts. Replace
defective gaskets. Replace leaking cylinder-head gaskets, and tighten loose
head nuts (par. 122).
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Valve mechanism. Inspect the valve adjustment if excessive tappet noise or loss
of power is noticed. See if the valve tappets, springs, and valve cover gaskets
are in good condition and secure. Check to see if oil is being delivered to the
valve mechanism.
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Adjust the valve clearance if necessary (par. 124). Secure the valve covers
using new gaskets.
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Crankcase. Check for leaks at crankcase gaskets, drain and fill plugs.
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Correct or report any leaks noted (par. 127).
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Belts and pulleys. Inspect condition and tension of drive belts and pulleys. Belts
should be adjusted only tight enough to prevent slippage.
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Adjust tension of belts if necessary. Replace worn or frayed belts (par. 132).
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Oil pressure. The oil pressure under normal operating conditions, should be 20 to
35 psi, as indicated on the gage. A spring loaded bypass valve regulates the
oil pressure.
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Adjust the oil pressure if necessary (par. 126).
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Governor. Check the governor adjustment. If the engine surges when running at
top speed without load, the governor is out of adjustment.
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Adjust or replace the governor, if necessary (par. 112).
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Fuel pump and housing. Inspect the fuel pump and fuel lines for gasoline leaks.
Check for oil leaks where the pump is fastened to the engine block and check for
loose mounting and assembly screws. Diluted oil indicates a faulty fuel pump.
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See that all mounting and assembly screws are tight, that the fuel lines are in
good condition, and that the connections are tight. If there is any indication of
lack of fuel supply to the carburetor, check the fuel pump (par. 111) before
dismantling. Repair or replace a defective fuel pump.
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Carburetor and linkage. Check the carburetor and linkage to see that they are in
good condition, correctly installed and assembled. See that the carburetor
does not leak, that the control linkage including the choke and throttle shaft, is
not badly worn. See that the choke valve opens fully when the control is in the
released position. Check for loose or missing screws or nuts to the manifold,
or screws holding the throttle body to the bowl assembly. Repair or replace a
defective carburetor (par. 110).
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