Mooney M20J 1978, Pilot Operating Handbook, Page: 126 / 164

SYSTEM
The engine h a s
a
full- pressure wet-sump oil
a n .capacity. An automatic bypass control valve
routes oil flow the cooler when operating temp-
e r a t u r e s a r e below or when the cooling radiator
is blocked,
ENGINE
down-&aft engine cooling system ground
and power cooling. Engine d i r e c t s
a i r over and around the cylinders and out the cowl
the flap doors allows proper a i r
flow on the ground and during low- speed high-pow
climbs. flap control full opens the
flaps. The cowl flaps should be partially opened,
pulled aft approximately two inches),
if necessary the oil cylinder head
temperature the normal operating
engine-driven
vacuum-operated gyroscopic flight Air
entering instruments filtered;
sluggish
or
e r r a t i c operation of
instruments may indicate that a vacuum
element I s adequate a i r intake. A
annunciator
is
provided t o monitor system operation,
PROPELLER
The propeller, of the constant speed type, is
a
single-
acting unit in which hydraulic, pressure? opposes
t h e
natural, centrifugal twisting of the rotating
blades, and the force of a spring, t o obtain the c o r r e c t
pitch for
t h e engine
Engine is
supplied t o the power piston in the propeller
the propeller The amount and p r e s s u r e of the
supplied controlled by an engine-driven governor.
Increasing speed will cause t o be admitted
the piston, thereby increasing the pitch.
,
decreasing engine speed will result in oil the
piston, thus decreasing the pitch.
7- 8 ISSUED 11-15-79