The hand-operated cylinder primer pump injects fuel into cylinders numbers 1, 2 , 3, 8 and 9. It is located on the left side of the pedestal, below the engine controls quadrant. To unlock the primer, the pump handle is to be pushed in and rotated anti-clockwise. After use the primer pump handle must be relocked by pushing in and rotating clockwise in order to prevent engine flooding and a fire risk when the booster pump is switched on. The engine is started by an electrical, direct-cranking starter. The starter switch for the electrical direct-cranking starter motor and the two starter switches required for the electrical inertia starter are located on the starter panel below the flight instrument pane. The switch or switches are spring-loaded to the OFF position. A boost coil switch is located on the starter panel. This switch is also spring-loaded to the OFF position. The engine drives either a Hamilton Standard, three bladed, constant speed, counterweight type propeller or a Hamilton Standard, three bladed, hydromatic, non-feathering propeller. Propeller control. The engine rpm are determined by the setting of the propeller control lever located on the quadrant on top of the pedestal. The control lever is connected to the propeller governor by a flexible cable and slides in a gate marked HIGH PITCH, DECREASE RPM and INCREASE RPM. The propeller governor automatically maintains any selected rpm within the operating range of the propeller, regardless of variation in air loads or flight attitudes. A friction control below the propeller control lever prevents the lever from creeping when rotated clockwise. The governor maintains the propeller blades within the constant speed range by supplying oil at engine pressure to the outboard end of the propeller actuating piston which, together with the centrifugal twisting moment acting on the blades, tends to move the blades towards low pitch. To balance the effect of both these forces, engine oil is boosted in pressure by the engine driven propeller governor and is passed to the inboard end of the propeller actuating piston to the blades towards high pitch. The propeller pitch can be changed by reselection of the propeller control lever which varies the load on the governor fly-weight and allows the governor pilot valve to take up a new position to maintain the propeller at the new selected constant speed setting. The oil tank, which is of 9 Imp. gal. (40,5 liters) capacity is located under the cockpit floor. Servicing of the oil tank is done through a filler neck on the left side of the fuselage. The oil cooler with an integral surge relief valve and a thermostatic by-pass valve is located behind the firewall and has its own air-flow system.
Posted on: Sun, 14 Sep 2014 16:29:30 +0000
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