Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-12-02
3
06.11.2013
6
8
Rev. No:
Rev. Date:
1
25.08.2014
Liquid Cooling System
1. General
2. Drain/Refill the coolant
A. Drain the coolant
(1) Open the drain plug. The coolant can drain off
through the plug.
(2) Attach a suitable length of hose with a diameter
of 14-15 mm (0.55 in to 0.59 in) onto the collar of
the plug, and insert the other end of the hose into
a collecting container.
(3) Open the clamp on the lower hose of the water
radiator, disconnect the hose and allow the cool-
ant to drain into a prepared collecting container.
(4) Open the clamp on the lower hose of the heat
exchanger, disconnect the hose and allow the
coolant to drain into a prepared collecting
container.
(5) Open the cover of the coolant filler (this allows
the coolant to drain faster).
(6) After draining tighten the drain plug.
Tightening torque: 10 Nm (7.4 lbf
.
ft)
(7) Reconnect the lower hoses of the water radiator
and the heat exchanger and tighten the clamps.
B. Fill up new coolant
(1) Fill up the cooling system with coolant according
to Chapter 0.6.2 by opening the coolant filler.
(2) Close the cover of the coolant filler.
(3) Perform a test run according to point 4.4.2 of
Operation and Maintenance Manual OM-02-02.
(4) Check the cooling system for leaks according to
Annex 3 of Operation and Maintenance Manual
OM-02-02.
(5) Allow the engine to cool down.
(6) Check coolant level.
WARNING:
Risk of scalding! The cooling system may be pressurized.
Carefully release the pressure before opening the drain plug.
CAUTION: Do not drain the coolant if its temperature is above 40°C!
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