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% % 1. General Maintenance Practices
% % This Section tells you about the maintenance practices for the components in the liquid cooling system.
% % 2. Remove/Install the Coolant Radiator
% Refer to Figure 2.
% % A. Remove the Coolant Radiator
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Detail Steps/Work Items Key Items/References
(1) Make sure that the engine is safe for maintenance: S Remove the key from the key switch.
(2) Remove the engine cowlings. Refer to Section 71-11.
WARNING: DO NOT REMOVE THE PRESSURE CAP FROM THE COOLANT TANK IF THE ENGINE IS HOT. THE PRESSURE IN THE SYSTEM CAN FORCE HOT COOLANT TO COME OUT AND BURN YOU.
(3) Remove the pressure cap from the coolant tank: S Turn the cap counter-clockwise a small distance to release the pressure. S When the pressure has fully released, turn the cap fully counter-clockwise.
(4) Drain the coolant: S Remove the drain plug from the left side of the coolant radiator near the bottom. S Open the drain plug on the engine RH lower side above the turbo-charger. Use a suitable container to catch the coolant. You need not remove this drain plug. Use a suitable duct to guide the coolant into the container.
(5) Disconnect the hose between the coolant tank and the bypass pipe. At the coolant tank.
(6) Disconnect the hose between the thermostat valve and the pipe to the coolant radiator. At the thermostat valve.
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Detail Steps/Work Items Key Items/References
(7) Disconnect the hose between the coolant radiator outlet and the bypass pipe. At the coolant radiator.
(8) Disconnect the overflow line. At the coolant tank near the pressure cap.
(9) Remove the 3 nuts and washers from the coolant radiator mounting points. The front outboard nut also attaches a bonding cable.
(10) Disconnect the electric wires from the coolant level sensor.
(11) Lift the coolant radiator together with the coolant tank clear of the airplane.
(12) Disconnect the hose between the coolant tank and the coolant radiator.
(13) Remove the nuts and bolts from the coolant tank support bracket that attaches to the coolant radiator.
(14) Remove the pipe and the hose from the coolant radiator inlet port.
(15) Put caps on the open end pipes and connections.
(16) Close the coolant drain-plug above the turbo-charger.
(17) Install the drain plug to the coolant radiator. Use a new copper gasket.
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