Vedeneyev M-14P, Maintenance Manual

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Oil seal bushings (8) and (35) are made of steel and have four grooves each to receive rings contacting with
their outer surfaces bushings (20) and (36), pressed in mixture collector (1) and diffuser (24).
The oil sealing rings are made of bronze. Each bushing receives four rings.
A wide annular groove with radial holes emerging to the annular spaces defined by the bushings and the
shaft is made at the middle of the oil seal bushing surface. These spaces are interconnected by two passages
milled in two opposite splines of the blower impeller shaft.
Radial holes in bushing (20) emerge into an annular space formed by the bushing and the mixture collector.
The space is connected to the atmosphere through a passage defined by breather pipe (4) pressed in the mixture
collector, and breather (2) driven into the upper part of mixture collector (1).
Atmospheric air getting into the annular grooves of the oil seal bushings decreases rarefaction in them, thus
decreasing suction of oil to the blower space and precluding ingress of oil to the fuel-air mixture.
LUBRICATION - DESCRIPTION AND OPERATION
1. GENERAL
Lubrication is intended to decrease friction and transfer heat from friction surface's of the operating engine
parts.
The oil system (Ref. Fig. 1) includes: the oil pump, oil sump, filter with chip detector, mesh filters.
The friction surfaces of the engine are lubricated under pressure and by splashing of oil. Oil under pressure
is fed to all main friction surfaces through internal passages. The cylinder walls, pistons, antifriction bearings, gear
teeth are lubricated by oil splashing.
Apart from decreasing friction and removing heat from friction surfaces, oil protects engine internal parts
against corrosion and carries away metal particles separated from friction surfaces as a result of wear to the oil
sump.
The oil sump is used to collect, settle and filter oil flowing down from the engine parts.
The filter with chip detector detects metal chips in the oil sump at breakage or intensive wear of operating
engine parts.
The mesh filters installed upstream of oil pump MN-14A and of the speed governor clean oil of mechanical
impurities.
Oil from the sump is scavenged through the oil cooler to the oil tank. The engine oil system construction
does not provide for scavenging oil from the engine in inverted flight because specified inverted flight duration does
not exceed 2 min.
The engine is not flooded with oil since the latter partially is drained to the oil tank
through the engine breathing system.
The engine oil system includes the following test instruments:
Temperature gauges for checking oil temperature at engine inlet and outlet. Oil pressure gauge for
measuring engine inlet oil pressure.
Oil is fed to all forced-lubrication parts of the engine by the MN-14A oil pump including delivery and
scavenging sections.