THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
2-16
Effective 01/01/08
Table 2-1: ENGINE PRESERVATION PROCEDURES
(Continued)
Engine Installed:
OPERATION PROCEDURE
10 to 30
Days
Over 30
Days
Engine
not
Installed:
Exhaust Valves
Thoroughly spray each exhaust valve with
corrosion preventive mixture through the
spark plug holes or the exhaust ports. Be
sure each exhaust valve is fully open when it
is being sprayed. Rotate the propeller shaft
at least four revolutions in the normal
direction of rotation to work the mixture into
the exhaust valve guides. Install the exhaust
port covers.
X X X
Rocker boxes
It will not be necessary to remove the
rockerbox covers and spray the rockers if the
engine was preserved at the specified oil
temperatures. Engines preserved under low
temperature, or if the alternate method of
treating cylinder bores is used, must have
the rockerbox covers removed and the
rockers, valve springs, washers, and valves
sprayed with corrosion preventive mixture.
X
Thrust Bearings
Remove any parts of the installation that
prevent access to the thrust bearing cover.
Preserve the thrust bearings of engines
incorporating a drilled passage through the
thrust bearing cover plate by removing the
pipe plug, installing a suitable tapered thread
connector, and pumping corrosion preventive
mixture (at room temperature) into the
passage at 80 PSI minimum pressure for at
least 15 seconds. Remove the connector
and reinstall the pipe plug.
On those engines not incorporating a drilled
passage in the thrust bearing cover plate,
remove the thrust bearing cover plate;
thoroughly spray the exposed portion of the
thrust bearings with the preservative mixture;
then reinstall the cover plate and tighten to
the recommended torque.
X X
