| AN 01-25CN-2 | PARAGRAPH 6 |
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The tank should be filled to the top of the filter neck before each flight. The filler cap is reached by means of an access door on the left top of the fuselage forward of the windshield. Two 1/2-inch O.D. vent tubes, one from the right and the other from the left side of the engine, drain to the tank. All discharge lines in the oil system are collected in one drain collector mounted on the left-hand engine mount truss assembly. Climbs up to 60° and dives up to 90° will be performed only with one-third or more of the maximum oil capacity. The oil tank is equipped with a pendulum assembly at the oil outlet which has a travel vertically of 75° and horizontally of 15° either side of the pendulum center line. (c) An oil temperature regulator is installed in the return line from the engine to the tank. Incorporated in the regulator is a thermostatic and pressure relief valve which controls the flow of oil through the cooler core and the jacket of the cooler as required to maintain the correct oil inlet temperature to the engine. This valve is entirely automatic and no adjustment is to be made except by the manufacturer. A one inch Vellumoid ring, Drawing 87-46-721 is de. signed to attach to the front face.of the oil cooler. This ring prevents the flow of air through the outer portion of the radiator core and thus keeps the oil warm and allows it to circulate more freely. This ring should be installed at or below a ground temperature of -90°C. (15° F.). If for any reason engine oil temperatures in excess of 90°C. (194° F.) are experienced, this oil cooler blanket should be removed. Install this ring by simply placing the ring over the radiator core. The air pressure will hold it in place. (d) For easier starting in cold weather, an oil dilution system is used, which introduces a quantity of gasoline into the oil inlet line at the "Y" drain cock before stopping the engine. The flow is controlled by a valve which is actuated by a solenoid, and is energized by a switch in the cockpit. When a low temperature start is anticipated, hold the toggle switch for the oil dilution solenoid in the "ON" position for two minutes while operating the engine at 800 to 1000 r.p.m. (e) There are no strainers in the oil system except the "Cuno" filter installed on the right rear side of the engine. |
(2) TO REMOVE THE OIL TANK. (a) Drain the oil system at the "Y" drain cock and at the plug on the end of the I" O.D. oil tank drain line, inboard of the "Y" drain. (b) Remove the 'section of cowl on top of the fuselage between Stations 1 and 2. (c) Disconnect the two lines at the top of the Oil tank. Disconnect these same two lines at a point forward of the coolant tank and remove these lines from the firewall. (d) In the cockpit, remove the gun sight and the gun sight support by removing the 4 bolts which hold the gun sight support to the armor plate. (e) Disconnect the engine inlet line at the elbow on the bottom of the tank. Disconnect the elbow fitting at the tank. (g) Disconnect the oil tank drain on the bot. tom of the rear of the tank. (h) Detach the upper cradle assembly by removing the four nuts holding it to the fuselage. (i) Remove the filled cap and pull the scupper off the filler neck. (j) Remove the tank from the rubber mountings in the lower cradle by raising it straight up. (3) TO REMOVE AND DISASSEMBLE THE OIL TANK PENDULUM. (a) Remove the ten screws that fasten the bottom inspection cover to the tank plate and remove the cover. (b) Hold the pendulum assembly with one hand through the bottom inspection hole while removing the six screws which attach the pendulum assembly to the oil outlet plate. (c) Carefully remove the pendulum assembly through the inspection hole. (d) The pendulum may now be disassembled by removing the three nuts that fasten the base to the pendulum. |
