THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/01/2008
4-15
A. Insure ignition and master switches
are in the OFF position.
B. Using blade turning bar, move
propeller blades to high pitch
position.
C. Remove cylinder head lock ring,
unscrew cylinder head. Remove
cylinder head gasket.
D. Remove the Little Giant seal. (If
piston gaskets were used, remove
cotter pin, unscrew piston gasket nut
and remove outboard piston gasket.)
E. Move the blades to a position near
the low angle setting of the propeller
and remove the two cotter pins from
the piston lock ring. Slide the lock
ring away from the spider.
*NOTE*
As the piston is unscrewed,
the front cone spacer
contacts the hub snap ring
and partially backs the
propeller off the shaft with
the piston.
F. Attach hoisting sling to propeller
blades. Using wrench and bar,
unscrew the piston completely from
the propeller shaft threads.
G. Disengage the hub snap ring from
the spider. Remove the front cone
packing washer, spacer, hub snap
ring and piston lock ring from the
piston. Remove piston from cylinder.
H. Cover the propeller shaft threads
with a thread protector or tape.
I. Slide the propeller carefully off the
shaft using care not to damage the
shaft threads and the splines of the
shaft or spider.
J. If another propeller is not to be
installed immediately, clean, oil and
cover propeller shaft.
PROPELLER INSTALLATION
If propeller assembly has been in
storage, clean off corrosion preventive
compound, wash all parts in kerosene
and dry using filtered compressed air.
Insure that all threaded parts are
thoroughly clean, and lightly coat all
internal surfaces with lubricating oil.
A. Install rear cone spacer and rear
cone on the propeller shaft. Push
them back against the engine thrust
nut.
B. Cover the shaft threads with a thread
protector or wrap with tape.
C. Remove the cylinder head lock ring
and cylinder head if installed.
D. Using propeller sling, hoist propeller.
Align blank spline with wide spline of
propeller shaft and install propeller
using care not to damage the
threads and the splines of the shaft
or spider. Slide propeller back
against rear cone.
E. Using blade turning device, turn the
blades to a position near the low
angle setting of the propeller. The
blades should be near the same
angle to keep the cylinder from being
cocked. Care should be exercised
during this operation to move both
blades at the same time and not to
pull the propeller off the shaft.
F. Remove the thread protector or tape
from the shaft threads.
G. Coat the shaft threads of the piston
with clean engine oil and insert the
piston through the cylinder. Place
the piston lock ring over the inboard
end of the piston with the end having
the large inside diameter facing the
cylinder.
H. Install the hub snap ring and the
front cone spacer in that order over
the end of the piston and push them
out against the lock ring.
I. Lightly coat the front cone and
packing washer with clean engine oil
and place the beveled end of the
packing washer against the beveled
inboard end of the piston.
J. Check the part numbers stamped on
the two front cone halves for
agreement and assemble the cone
