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Page Title:
Initial test set-up and conditions. |
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|  MIL-C-62310A(AT)
4.7.18.2 Drawdown capacity test. To determine conformance to 3.6.2.1.2, the engine
cooling system shall be subjected to the following test:
4.7.18.2.1 Initial test set-up and conditions. Set-up and initial test conditions shall be as
specified in 4.7.18.1.1 and 4.7.18.1.2, except air injection fitting shall be replaced with a hose
and valve suitable for draining coolant during test, and pressure cap shall be removed.
4.7.18.2.2 Data requirements. Before test, determine pressure rise across the water pump as
a function of coolant flow. The coolant temperature shall be 180 5F with the pressure cap off.
NOTE: Differential pressure across the pump shall be used to determine coolant flow
(turbine flowmeter may not be accurate when quantity of coolant. is reduced). Excepting drained
coolant volume, the following data shall be continuously recorded during test:
a.
Engine speed.
b.
Coolant flow.
c.
Coolant temperature (radiator inlet).
d.
Differential pressure across water pump.
e.
Coolant volume drained from system (see 4.7.18.2.3).
f.
Air entrained in coolant from radiator. 1/
g.
Air entrained in coolant makeup line. 1/
1/ Monitored visually, using sight glass.
4.7.18.2.3 Test procedure. Insure that cooling system is full as specified in 4.7.18.1.4. Start
engine and establish initial operating conditions specified in 4.7.18.2.1. Insure visually that
coolant is free of air. Drain 1 quart of coolant from system each minute (minimum) until
11 quarts have been drained.
4.7.18.2.4 Test failure. The test is a failure, unless the following criteria are satisfied:
a. Coolant flow rate shall not fall below 98 percent of its initial value.
b. There shall be no indication of entrained air in the coolant.
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