THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/01/08
2-17
Table 2-1: ENGINE PRESERVATION PROCEDURES
(Continued)
Engine Installed:
OPERATION PROCEDURE
10 to 30
Days
Over 30
Days
Engine
not
Installed:
Cylinder
Treatment
With the piston at the bottom of its intake
stroke, spray hot, 99ºC to 140ºC (210ºF to
220º F), corrosion preventive mixture into the
front spark plug hole of each cylinder and in
the same sequence as the firing order. This
spray should be deposited on the inlet valves
and the cylinder walls.
Rotate the propeller shaft at least six
revolutions to ensure piston ring coverage for
each cylinder, without turning the propeller
shaft, to cover the cylinder walls. Do not turn
the propeller shaft after this spraying of the
cylinders. If the shaft is turned the spraying
procedure must be repeated.
NOTE:
Do not apply excessive amounts of
material. All that is necessary is a uniform
thin coating on all surfaces. Excessive
amounts of material do not contribute to the
preservation; they cause difficulty at the time
of depreservation and increase the chances
of hydraulic lock.
It is of the utmost importance that personnel
entrusted with the cylinder spray operation
be properly trained in the techniques
required. It is recommended that the
operator practice on dummy cylinders until
the desired even coat can be applied. The
type of spray pattern formed can be
observed by spraying into a suitable
receptacle. The recommended procedure
to be used by the operator is as follows:
a. Place the preservative mixture in the
reservoir; heat to the correct operating
temperature; and mix thoroughly.
Premixing and preheating the compound
prior to placing it in the reservoir will be a
time saver.
b. Close the vessel and connect the gun
and all lines.
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