DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 83 / 163

Maintenance Manual DG-808C
Issued: May 2012 TN 800/41 4.22
4.16 Filling and bleeding the cooling system, checking the coolant pump
Please refer to diagram 9
Coolant: Commercially available anti-freeze for car engines
(recommended: BASF Glysantin G48 Protect Plus concentrate) and
distilled water. You will need approx. 1.8 liter , 0.475 US.gal..
With coolant pump type Webasto: mixing ratio 1:1 (up to approx.
–40°C, -40°F)
With coolant pump type Pierburtg:
Normal operation: mixing ratio 1:2 (up to approx. –20°C, -4°F).
The mixing ration may be changed for high altitude flying to mixing ratio
1:1 (up to approx. –40°C, -40°F). If you exchange the coolant to change
the mixing ration store the coolant for the next change.
4.16.1 Inspection of the coolant pump
1. Extend the engine
2. Remove the coolant hose from the radiator (upper end). Insert the test
adapter W59 (drawing see enclosure to this MM) into the hose and
secure with a hose clamp. Install a PVC hose (instrument line) on the
other end of the adapter and put its end in a calibrated container.
3. Switch on the ignition and measure the time needed to fill 0.2 liters into
the container, then switch off the ignition immediately. Otherwise the
pump will suck in air and bleeding may be difficult.
Normal time is between 15 and 20 seconds.
4. If the time needed exceeds 25 seconds the pump is worn and should be
exchanged. Repeat the test after installation of the new pump.
5. Remove the adapter and connect the coolant hose to the radiator again.
6. Remove the screw cap of the radiator. Press down on cap for easier
handling and fill in the coolant from the test, if necessary refill coolant.
7. Switch on the ignition to run the coolant pump. Run for approx. 1
minute. Switch off the ignition. If necessary top up the radiator.
8. Close the radiator cap.