STARTING THE PEGASUS RADIAL ENGINE
All radial engines have an inherent tendency to possibly become
hydraulically locked. This means that the 3 bottom cylinders can
become flooded with fuel and oil causing the engine not to turn
over. Before attempting to start the engine, always roll the engine
through several revolutions (making sure the ignition is turned off
before rotating). If the engine does not want to rotate past a
certain point, do not try to force it. At this time, you will need to
remove the spark plugs from the 3 bottom cylinders and rotate the
engine until all excess fuel and oil is pumped out the spark plug
hole. Reinstall the spark plugs and continue the starting procedure.
When the engine is cold, first be sure the Ignition switch is off, the
fuel pump is on and the choke is closed. Flip the prop
approximately 5 times. This will prime the engine with fuel. Next
with the choke in the open position, set the throttle to about ¼
throttle. Turn the ignition switch on and start the engine. To insure
that all cylinders are firing, you can use a temperature gun to check
the exhaust temperature near the cylinder head. All cylinders
should be similar in temperature and the engine running smoothly.
To start the engine when it is hot or warm, first turn the fuel pump
on and the ignition off, close the choke and flip the prop 2 or 3
times. Open the choke, turn the ignition on and set the throttle just
above idle to start the engine. Our test engines usually start with
one flip of the propeller blade.
OPERATING AND TUNING
Operating and tuning your
PEGASUS AIRCRAFT ENGINES
radial
engine is not difficult but requires attention to carburetor tuning,
propeller choice, periodic valve adjustment & lubrication, correct
(fresh) fuel and overall awareness of its general condition.
