The front part of the steel bushing has drilled holes communicating with the atmosphere through the
annular recess, passage in the vertical wall and a steel pipe.
A boss with passage to supply mixture from the carburetor to the blower impeller is located in the lower
part of the mixture collector.
The boss end face is provided with a flange having two threaded holes with studs for attachment of the
carburetor.
The boss of the intake branch pipe of cylinder No. 1 is provided with a flange having two studs to mount
the engine rear breather.
The boss of the branch pipe of cylinder Ho. 2 has a threaded hole for the mixture pressure measuring
connection; the threaded hole made in the boss of the branch pipe of cylinder No. 9 is intended to receive ,the
starting nozzle.
To drain oil from the rear cover and ensure inverted-flight breathing through the oil sump, and to supply oil
to the oil pump scavenging section, holes are made in the mixture collector lower part extending through the web
in the passage for supply of mixture to the blower impeller.
The diffuser of the blower and rear cover are attached to the rear flange of the mixture collector by ten
studs.
2.2. DIPPUSER
The blower diffuser (Ref. Fig. 3) is cast of aluminium alloy, has front and rear flanges with collars to be
aligned on the mixture collector and rear cover of the crankcase.
Fifteen shaped blades are made on the diffuser annular surface at the front side which form passages
gradually expanding from the center towards periphery.
The flange has ten drilled holes to secure the diffuser, two holes in the diffuser lower part for draining and
scavenging oil (the latter hole has a pressed-in steel transfer bushing) and one hole in the upper part for breathing
the space of the rear cover in normal flight and draining oil from the rear cover space in inverted flight.
The blower rear seal assembly steel bushing is pressed in the diffuser central hole.
Provided in the lower part of the rear flange is a boss whose bore has pressed-in aluminium bushing. The
bushing is a front support for a twin gear of the blower drive. Two bosses in the rear flange lower part are intended
to mount the twin gear rear support cover with the aid of four studs.
A hole of the oil passage for lubricating the twin gear supports is made in the rear flange.
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