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% TABLE OF CONTENTS % % CHAPTER 37 % VACUUM SYSTEM % 1. General ..............................................1 % 2. Description............................................1 % 3. Operation.............................................3 % Trouble-Shooting % 1. General ............................................101 % Maintenance Practices % 1. General ............................................201 % 2. Remove/Install the Vacuum Regulator.....................201 % 3. Replace the Vacuum System Air Filter.....................203 % 4. Adjust the Vacuum Regulator............................204 % 5. Remove/Install the Suction Gauge........................205
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% CHAPTER 37 % VACUUM SYSTEM % 1. General
% The DA 40 with the TAE 125 Diesel engine has a vacuum system. The system uses the vacuum pump % that is part of the TAE 125 Diesel engine. You cannot replace the vacuum pump. If you have trouble % with the pump, refer to the engine manufacturer.
% 2. Description
% Figure 1 shows the vacuum system schematic diagram. Figure 2 shows the installation and locations. % A vacuum pump that is integral with the engine powers the system. A flexible hose connects the pump % to a vacuum regulating valve located on the aft face of the firewall. A small orifice in the pipe restricts % the airflow to the correct level for the system.
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Suction Gauge
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% % % Figure 2: Vacuum System Installation %
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% The inlet pipe of the valve goes through the firewall. Nuts on the inlet pipe attach the valve to the % firewall. The regulator valve has an adjuster at the bottom. You can adjust the valve to give the % correct suction, usually between 4.8 and 5.4 inHg.
% A flexible hose goes from the regulator valve to a directional gyro located on the left of the instrument % panel. A flexible hose goes from the directional gyro to an inlet filter located on the instrument panel % floor. A small flexible hose goes from the directional gyro to a suction gauge located at the top of the % instrument panel.
% 3. Operation
% The vacuum pump reduces the air pressure in the system. Air flows into the air filter. It flows to the % directional gyro. In the directional gyro it passes through a nozzle and operates a small turbine. The % outlet from the turbine flows to the vacuum pump.
% The suction gauge connects to the main flow in the directional gyro. The gauge shows the vacuum % (suction) at the inlet to the gyro.
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% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the vacuum system. If you have the trouble % detailed in the Trouble column read across to the Possible Cause column. Then do the repair given % in the Repair column.
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Trouble  Possible Cause  Repair 
Vacuum gauge shows no vacuum. Vacuum operated instruments do not operate  Vacuum pump defective. Vacuum regulator defective. Vacuum system leaking.  Refer to the engine manufacturer. Replace the vacuum regulator. Do a test for leakage. Repair the leak. 
Vacuum gauge shows no vacuum. Vacuum operated instruments operate correctly.  Vacuum gauge defective.  Replace the vacuum gauge. 
　
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