Pre-Oiling (Optional); Carburetor; Carburetor Removal; Carburetor Installation - Thrush Aircraft S2R-R1340 Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2R-R1340
C. While the pre-oiling is in progress,
turn the propeller shaft in the normal
direction of rotation to prevent the
accumulation of oil in the lower
cylinders and to aid in the distribution
of the oil to the bearings.
D. At completion, install the drain plug
and washer in the sump, and
lockwire the plug.
E. Service oil tank.

PRE-OILING (OPTIONAL)

A. Remove front spark plugs, one top
cylinder rocker box cover, and main
oil sump plug.
B. Turn engine with starter until flowing
oil appears at top rocker assembly
and a minimum of one gallon of oil
drains from the sump.
*NOTE*
Do not use starter for more
than 3 minutes at a time
without allowing
cooling period to prevent
overheating of starter.
C. Replace sump plug, rocker box
gasket and cover, front spark plugs,
and service oil tank.
D. Upon initial start, do not exceed
1000 RPM
temperature reaches 40ºC (104ºF),
and do not exceed 1800 RPM until
oil temperature
(140ºF), and the oil pressure is within
normal operating range.

CARBURETOR

The Stromberg
carburetor is a two-barrel, two-float
updraft type carburetor (see Figure 4-4).
The carburetor meters fuel in proportion
to the mass air flow to the engine. The
mass air flow to the engine is determined
by the throttle opening.
metered by the carburetor, the fuel is
discharged into the air-stream to the
impeller where it is thoroughly mixed with
the air, vaporized, and then delivered to
Effective: 01/01/2008
AIRCRAFT MAINTENANCE MANUAL
sufficient
until engine oil
reaches 60ºC
Model NA-Y9E1
After being
the cylinders through the intake pipes
and inlet valves.

CARBURETOR REMOVAL

Carburetor removal
accomplished as follows:
A. Remove access panels.
B. Disconnect throttle
control linkage.
C. Disconnect and cap all fuel lines at
carburetor.
D. Remove nuts holding carburetor to
adapter duct assembly. Loosen air
mixing chamber flexible hose and
braces as required to allow for
carburetor removal.
E. Remove nuts holding carburetor to
engine, remove
install cover on mounting pad.

CARBURETOR INSTALLATION

The NA-Y9E1 carburetor is mounted on
the engine so that the float chambers are
located front and rear with the fuel inlet to
the rear. The fuel inlet, a 1/2 pipe tap, is
located at the top of the fuel strainer
boss. The fuel
connection, a 1/8 pipe tap, is provided on
the side of the strainer boss. To install
the carburetor proceed as follows:
A. Remove cover from mounting pad.
Install carburetor (no gasket) on
mounting studs
required (see Table 2-3, Section 2).
B. Install adapter duct assembly to
carburetor. Tighten mixing chamber
flex hose and braces that were
loosened or
carburetor removal.
C. Uncap and install all fuel lines.
D. Connect throttle and mixture control
linkage.
*NOTE*
The throttle lever has a 70
degree radial
requires a
movement of 1-25/32 inches.
may be
and mixture
carburetor and
pressure gage
and torque as
removed during
travel and
control rod
4-11